Ejercicios propuestos y resueltos Java Threads

15/05/20192 comentarios

Hola a todos, hoy os dejo una serie de ejercicios propuestos y resueltos Java de backtraking.

Todos los ejercicios que proponemos están resueltos en este mismo post, intenta hacerlo por ti mismo y si te quedas atascado puedes mirar la solución. Recuerda, que no tiene por que estar igual tu solución con la del post, el objetivo es que aprendas no que me copies la solución.

Te recomiendo que uses mensajes de trazas, donde te sean necesarios. Si tienes problemas también puedes usar el depurador.

Aquí tienes todos los posts relacionados con Java:

Curso Java

1. Crea una clase llamada HiloNumerosLetras que implemente runnable y tenga de atributo un numero llamado tipo.

Si el tipo es 1, mostrara los numeros del 1 al 30

Si el tipo es 2, mostrara las letras de la ‘a’ a la ‘z’.

Spoiler

HiloNumeroLetras.java

package ejercicio_thread_ddr_1;

public class HiloNumeroLetras implements Runnable{

    //Atributos
    private int tipo;

    //Constructor
    public HiloNumeroLetras(int tipo) {
        this.tipo = tipo;
    }
    
    @Override
    public void run() {
        
        //Bucle infinito
        while (true) {
            //Segun el tipo hace una u otra cosa
            switch (tipo) {
                case 1:
                    //numeros
                    for (int i = 1; i < 30; i++) {
                        System.out.println(i);
                    }
                    break;
                case 2:
                    //letras
                    for (char c = 'a'; c < 'z'; c++) {
                        System.out.println(c);
                    }
                    break;
                    
            }

        }
        
    }
    
}

package ejercicio_thread_ddr_1;

public class HiloNumeroLetras implements Runnable{

//Atributos

private int tipo;

//Constructor

public HiloNumeroLetras(int tipo) {

this.tipo = tipo;

}

@Override

public void run() {

//Bucle infinito

while (true) {

//Segun el tipo hace una u otra cosa

switch (tipo) {

case 1:

//numeros

for (int i = 1; i < 30; i++) {

System.out.println(i);

}

break;

case 2:

//letras

for (char c = 'a'; c < 'z'; c++) {

System.out.println(c);

}

break;

}

Ejercicio_thread_DDR_1.java

package ejercicio_thread_ddr_1;

public class Ejercicio_thread_DDR_1 {

    public static void main(String[] args) {
        
        HiloNumeroLetras h1 = new HiloNumeroLetras(1);
        HiloNumeroLetras h2 = new HiloNumeroLetras(2);
        
        Thread t1 = new Thread(h1);
        Thread t2 = new Thread(h2);
        
        t1.start();
        t2.start();
        
    }

}

package ejercicio_thread_ddr_1;

public class Ejercicio_thread_DDR_1 {

public static void main(String[] args) {

HiloNumeroLetras h1 = new HiloNumeroLetras(1);

HiloNumeroLetras h2 = new HiloNumeroLetras(2);

Thread t1 = new Thread(h1);

Thread t2 = new Thread(h2);

t1.start();

t2.start();

}

2. Crea una clase llamada Contador que contenga un atributo que sea un contador,
otro que sea el nombre del hilo y otro que sea el limite del contador, es decir, donde debe acabar.

Crea varios contadores y ejecútalos.

Spoiler

Contador.java

package ejercicio_thread_ddr_2;

public class Contador implements Runnable {

    //Atributos
    private int contador;
    private String nombre;
    private int limite;

    //Constructor
    public Contador(String nombre, int limite) {
        this.contador = 0;
        this.nombre = nombre;
        this.limite = limite;
    }

    @Override
    public void run() {

        //Recorremos los numeros
        while (contador <= limite) {
            System.out.println("Hilo " + nombre + ": " + contador);
            contador++;
        }

        //fin de hilo
        System.out.println("Hilo " + nombre + " ya ha acaado");
        
    }

}

package ejercicio_thread_ddr_2;

public class Contador implements Runnable {

//Atributos

private int contador;

private String nombre;

private int limite;

//Constructor

public Contador(String nombre, int limite) {

this.contador = 0;

this.nombre = nombre;

this.limite = limite;

}

@Override

public void run() {

//Recorremos los numeros

while (contador <= limite) {

System.out.println("Hilo " + nombre + ": " + contador);

contador++;

}

//fin de hilo

System.out.println("Hilo " + nombre + " ya ha acaado");

}

Ejercicio_thread_DDR_2.java

package ejercicio_thread_ddr_2;

import java.util.logging.Level;
import java.util.logging.Logger;

public class Ejercicio_thread_DDR_2 {

    public static void main(String[] args) {

        //Creamos los objetos
        Contador c1 = new Contador("Contador 1", 40);
        Contador c2 = new Contador("Contador 2", 50);
        Contador c3 = new Contador("Contador 3", 20);
        Contador c4 = new Contador("Contador 4", 70);

        //Creamos los hilos
        Thread t1 = new Thread(c1);
        Thread t2 = new Thread(c2);
        Thread t3 = new Thread(c3);
        Thread t4 = new Thread(c4);

        //Iniciamos los hilos
        t1.start();
        t2.start();
        t3.start();
        t4.start();

        //Esperamos a que acaben los hilos
        try {
            t1.join();
            t2.join();
            t3.join();
            t4.join();
        } catch (InterruptedException ex) {
            Logger.getLogger(Ejercicio_thread_DDR_2.class.getName()).log(Level.SEVERE, null, ex);
        }

        //Fin
        System.out.println("Fin del programa");

    }

}

package ejercicio_thread_ddr_2;

import java.util.logging.Level;

import java.util.logging.Logger;

public class Ejercicio_thread_DDR_2 {

public static void main(String[] args) {

//Creamos los objetos

Contador c1 = new Contador("Contador 1", 40);

Contador c2 = new Contador("Contador 2", 50);

Contador c3 = new Contador("Contador 3", 20);

Contador c4 = new Contador("Contador 4", 70);

//Creamos los hilos

Thread t1 = new Thread(c1);

Thread t2 = new Thread(c2);

Thread t3 = new Thread(c3);

Thread t4 = new Thread(c4);

//Iniciamos los hilos

t1.start();

t2.start();

t3.start();

t4.start();

//Esperamos a que acaben los hilos

try {

t1.join();

t2.join();

t3.join();

t4.join();

} catch (InterruptedException ex) {

Logger.getLogger(Ejercicio_thread_DDR_2.class.getName()).log(Level.SEVERE, null, ex);

}

//Fin

System.out.println("Fin del programa");

}

3. Haz una ventana de un reloj digital. Te muestro un ejemplo:

Spoiler

RelojDigital.java

package ejercicio_thread_ddr_3;

import java.util.Observable;
import java.util.logging.Level;
import java.util.logging.Logger;

public class RelojDigital extends Observable implements Runnable {

    private int horas, minutos, segundos;

    public RelojDigital(int horas, int minutos, int segundos) {
        this.horas = horas;
        this.minutos = minutos;
        this.segundos = segundos;

    }

    @Override
    public void run() {

        String tiempo;
        try {
            while (true) {

                tiempo = "";

                if (horas < 10) {
                    tiempo += "0" + horas;
                } else {
                    tiempo += horas;
                }

                tiempo += ":";

                if (minutos < 10) {
                    tiempo += "0" + minutos;
                } else {
                    tiempo += minutos;
                }

                tiempo += ":";

                if (segundos < 10) {
                    tiempo += "0" + segundos;
                } else {
                    tiempo += segundos;
                }

                this.setChanged();
                this.notifyObservers(tiempo);
                this.clearChanged();
                Thread.sleep(1000);

                segundos++;

                if (segundos == 60) {
                    minutos++;
                    segundos = 0;
                    if (minutos == 60) {
                        minutos = 0;
                        horas++;
                        if (horas == 24) {
                            horas = 0;
                        }
                    }
                }

            }
        } catch (InterruptedException ex) {
            Logger.getLogger(RelojDigital.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

}

package ejercicio_thread_ddr_3;

import java.util.Observable;

import java.util.logging.Level;

import java.util.logging.Logger;

public class RelojDigital extends Observable implements Runnable {

private int horas, minutos, segundos;

public RelojDigital(int horas, int minutos, int segundos) {

this.horas = horas;

this.minutos = minutos;

this.segundos = segundos;

}

@Override

public void run() {

String tiempo;

try {

while (true) {

tiempo = "";

if (horas < 10) {

tiempo += "0" + horas;

} else {

tiempo += horas;

}

tiempo += ":";

if (minutos < 10) {

tiempo += "0" + minutos;

} else {

tiempo += minutos;

}

tiempo += ":";

if (segundos < 10) {

tiempo += "0" + segundos;

} else {

tiempo += segundos;

}

this.setChanged();

this.notifyObservers(tiempo);

this.clearChanged();

Thread.sleep(1000);

segundos++;

if (segundos == 60) {

minutos++;

segundos = 0;

if (minutos == 60) {

minutos = 0;

horas++;

if (horas == 24) {

horas = 0;

}

} catch (InterruptedException ex) {

Logger.getLogger(RelojDigital.class.getName()).log(Level.SEVERE, null, ex);

}

FrmContador.java

package ejercicio_thread_ddr_3;

import java.util.Observable;
import java.util.Observer;

public class FrmContador extends javax.swing.JFrame implements Observer{

    public FrmContador() {
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // //GEN-BEGIN:initComponents
    private void initComponents() {

        lblCronometro = new javax.swing.JLabel();
        btnIniciar = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Reloj digital");

        lblCronometro.setFont(new java.awt.Font("Tahoma", 1, 48)); // NOI18N

        btnIniciar.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
        btnIniciar.setText("Iniciar");
        btnIniciar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnIniciarActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(22, 22, 22)
                .addComponent(lblCronometro, javax.swing.GroupLayout.PREFERRED_SIZE, 246, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(btnIniciar, javax.swing.GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(lblCronometro, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(btnIniciar, javax.swing.GroupLayout.DEFAULT_SIZE, 129, Short.MAX_VALUE))
                .addContainerGap())
        );

        pack();
    }// //GEN-END:initComponents

    private void btnIniciarActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnIniciarActionPerformed

        this.btnIniciar.setEnabled(false);
        
        RelojDigital r = new RelojDigital(23, 59, 50);
        r.addObserver(this);
        Thread t = new Thread(r);
        t.start();
        
    }//GEN-LAST:event_btnIniciarActionPerformed

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new FrmContador().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton btnIniciar;
    private javax.swing.JLabel lblCronometro;
    // End of variables declaration//GEN-END:variables

    @Override
    public void update(Observable o, Object arg) {
        lblCronometro.setText((String) arg);
    }

}

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package ejercicio_thread_ddr_3;

import java.util.Observable;

import java.util.Observer;

public class FrmContador extends javax.swing.JFrame implements Observer{

public FrmContador() {

initComponents();

}

/**

* This method is called from within the constructor to initialize the form.

* WARNING: Do NOT modify this code. The content of this method is always

* regenerated by the Form Editor.

@SuppressWarnings("unchecked")

// //GEN-BEGIN:initComponents

private void initComponents() {

lblCronometro = new javax.swing.JLabel();

btnIniciar = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

setTitle("Reloj digital");

lblCronometro.setFont(new java.awt.Font("Tahoma", 1, 48)); // NOI18N

btnIniciar.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N

btnIniciar.setText("Iniciar");

btnIniciar.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

btnIniciarActionPerformed(evt);

}

});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(22, 22, 22)

.addComponent(lblCronometro, javax.swing.GroupLayout.PREFERRED_SIZE, 246, javax.swing.GroupLayout.PREFERRED_SIZE)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

.addComponent(btnIniciar, javax.swing.GroupLayout.DEFAULT_SIZE, 97, Short.MAX_VALUE)

.addContainerGap())

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addContainerGap()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addComponent(lblCronometro, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(btnIniciar, javax.swing.GroupLayout.DEFAULT_SIZE, 129, Short.MAX_VALUE))

.addContainerGap())

);

pack();

}// //GEN-END:initComponents

private void btnIniciarActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnIniciarActionPerformed

this.btnIniciar.setEnabled(false);

RelojDigital r = new RelojDigital(23, 59, 50);

r.addObserver(this);

Thread t = new Thread(r);

t.start();

}//GEN-LAST:event_btnIniciarActionPerformed

/**

* @param args the command line arguments

public static void main(String args[]) {

/* Set the Nimbus look and feel */

/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.

* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html

try {

for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {

if ("Nimbus".equals(info.getName())) {

javax.swing.UIManager.setLookAndFeel(info.getClassName());

break;

}

} catch (ClassNotFoundException ex) {

java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (InstantiationException ex) {

java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (IllegalAccessException ex) {

java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (javax.swing.UnsupportedLookAndFeelException ex) {

java.util.logging.Logger.getLogger(FrmContador.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

}

/* Create and display the form */

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new FrmContador().setVisible(true);

}

});

}

// Variables declaration - do not modify//GEN-BEGIN:variables

private javax.swing.JButton btnIniciar;

private javax.swing.JLabel lblCronometro;

// End of variables declaration//GEN-END:variables

@Override

public void update(Observable o, Object arg) {

lblCronometro.setText((String) arg);

}

4. Haz una ventana con 4 progressbar, se crearan 4 hilos que representaran a caballos (que tienen un nombre y un camino recorrido o porcentaje recorrido). Al pulsar el botón de iniciar se empezará a avanzar, actualizando los progressbar con un numero aleatorio entre 1 y 15.

Gana el primero que llegue a 100.

Spoiler

FrmCarrera.java

package ejercicio_thread_ddr_4;

import java.util.Observable;
import java.util.Observer;

public class FrmCarrera extends javax.swing.JFrame implements Observer {

    private Thread[] hilos;
    
    
    public FrmCarrera() {
        initComponents();
        hilos = new Thread[4];
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // //GEN-BEGIN:initComponents
    private void initComponents() {

        pg1 = new javax.swing.JProgressBar();
        jLabel1 = new javax.swing.JLabel();
        pg2 = new javax.swing.JProgressBar();
        jLabel2 = new javax.swing.JLabel();
        pg3 = new javax.swing.JProgressBar();
        jLabel3 = new javax.swing.JLabel();
        pg4 = new javax.swing.JProgressBar();
        jLabel4 = new javax.swing.JLabel();
        btnIniciar = new javax.swing.JButton();
        jLabel5 = new javax.swing.JLabel();
        lblGanador = new javax.swing.JLabel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        pg1.setStringPainted(true);

        jLabel1.setText("Caballo 1");

        pg2.setStringPainted(true);

        jLabel2.setText("Caballo 2");

        pg3.setStringPainted(true);

        jLabel3.setText("Caballo 3");

        pg4.setStringPainted(true);

        jLabel4.setText("Caballo 4");

        btnIniciar.setText("Iniciar");
        btnIniciar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnIniciarActionPerformed(evt);
            }
        });

        jLabel5.setText("El ganador es: ");

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addContainerGap()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel1)
                                .addGap(18, 18, 18)
                                .addComponent(pg1, javax.swing.GroupLayout.PREFERRED_SIZE, 533, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel2)
                                .addGap(18, 18, 18)
                                .addComponent(pg2, javax.swing.GroupLayout.PREFERRED_SIZE, 533, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel3)
                                .addGap(18, 18, 18)
                                .addComponent(pg3, javax.swing.GroupLayout.PREFERRED_SIZE, 533, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jLabel4)
                                .addGap(18, 18, 18)
                                .addComponent(pg4, javax.swing.GroupLayout.PREFERRED_SIZE, 533, javax.swing.GroupLayout.PREFERRED_SIZE))
                            .addComponent(btnIniciar, javax.swing.GroupLayout.PREFERRED_SIZE, 595, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(225, 225, 225)
                        .addComponent(jLabel5)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(lblGanador, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addContainerGap(19, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(33, 33, 33)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(9, 9, 9)
                        .addComponent(jLabel1))
                    .addComponent(pg1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(9, 9, 9)
                        .addComponent(jLabel2))
                    .addComponent(pg2, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(9, 9, 9)
                        .addComponent(jLabel3))
                    .addComponent(pg3, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(9, 9, 9)
                        .addComponent(jLabel4))
                    .addComponent(pg4, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 20, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jLabel5, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(lblGanador, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGap(18, 18, 18)
                .addComponent(btnIniciar, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(34, 34, 34))
        );

        pack();
    }// //GEN-END:initComponents

    private void btnIniciarActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnIniciarActionPerformed

        this.btnIniciar.setEnabled(false);
        this.lblGanador.setText("");
        
        for (int i = 0; i < hilos.length; i++) {
            Caballo c = new Caballo((i+1)+"");
            c.addObserver(this);
            hilos[i] = new Thread(c);
            hilos[i].start();
        }
        
        
        
    }//GEN-LAST:event_btnIniciarActionPerformed

    private void terminar(){
        
        for (int i = 0; i < hilos.length; i++) {
            hilos[i].interrupt();
        }
        
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(FrmCarrera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(FrmCarrera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(FrmCarrera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(FrmCarrera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new FrmCarrera().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton btnIniciar;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel lblGanador;
    private javax.swing.JProgressBar pg1;
    private javax.swing.JProgressBar pg2;
    private javax.swing.JProgressBar pg3;
    private javax.swing.JProgressBar pg4;
    // End of variables declaration//GEN-END:variables

    @Override
    public void update(Observable o, Object arg) {

        Caballo c = (Caballo) o;
        int porcentaje = (int) arg;

        switch (c.getNombre()) {
            case "1":
                this.pg1.setValue(porcentaje);
                break;

            case "2":
                this.pg2.setValue(porcentaje);
                break;

            case "3":
                this.pg3.setValue(porcentaje);
                break;

            case "4":
                this.pg4.setValue(porcentaje);
                break;

        }

        if(porcentaje>=100){
           terminar();
           this.btnIniciar.setEnabled(true);
           this.lblGanador.setText("Caballo "+c.getNombre());
        }
        
        
    }

}

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package ejercicio_thread_ddr_4;

import java.util.Observable;

import java.util.Observer;

public class FrmCarrera extends javax.swing.JFrame implements Observer {

private Thread[] hilos;

public FrmCarrera() {

initComponents();

hilos = new Thread[4];

}

/**

* This method is called from within the constructor to initialize the form.

* WARNING: Do NOT modify this code. The content of this method is always

* regenerated by the Form Editor.

@SuppressWarnings("unchecked")

// //GEN-BEGIN:initComponents

private void initComponents() {

pg1 = new javax.swing.JProgressBar();

jLabel1 = new javax.swing.JLabel();

pg2 = new javax.swing.JProgressBar();

jLabel2 = new javax.swing.JLabel();

pg3 = new javax.swing.JProgressBar();

jLabel3 = new javax.swing.JLabel();

pg4 = new javax.swing.JProgressBar();

jLabel4 = new javax.swing.JLabel();

btnIniciar = new javax.swing.JButton();

jLabel5 = new javax.swing.JLabel();

lblGanador = new javax.swing.JLabel();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

pg1.setStringPainted(true);

jLabel1.setText("Caballo 1");

pg2.setStringPainted(true);

jLabel2.setText("Caballo 2");

pg3.setStringPainted(true);

jLabel3.setText("Caballo 3");

pg4.setStringPainted(true);

jLabel4.setText("Caballo 4");

btnIniciar.setText("Iniciar");

btnIniciar.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

btnIniciarActionPerformed(evt);

}

});

jLabel5.setText("El ganador es: ");

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addContainerGap()

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addComponent(jLabel1)

.addGap(18, 18, 18)

.addComponent(pg1, javax.swing.GroupLayout.PREFERRED_SIZE, 533, javax.swing.GroupLayout.PREFERRED_SIZE))

.addGroup(layout.createSequentialGroup()

.addComponent(jLabel2)

.addGap(18, 18, 18)

.addComponent(pg2, javax.swing.GroupLayout.PREFERRED_SIZE, 533, javax.swing.GroupLayout.PREFERRED_SIZE))

.addGroup(layout.createSequentialGroup()

.addComponent(jLabel3)

.addGap(18, 18, 18)

.addComponent(pg3, javax.swing.GroupLayout.PREFERRED_SIZE, 533, javax.swing.GroupLayout.PREFERRED_SIZE))

.addGroup(layout.createSequentialGroup()

.addComponent(jLabel4)

.addGap(18, 18, 18)

.addComponent(pg4, javax.swing.GroupLayout.PREFERRED_SIZE, 533, javax.swing.GroupLayout.PREFERRED_SIZE))

.addComponent(btnIniciar, javax.swing.GroupLayout.PREFERRED_SIZE, 595, javax.swing.GroupLayout.PREFERRED_SIZE)))

.addGroup(layout.createSequentialGroup()

.addGap(225, 225, 225)

.addComponent(jLabel5)

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)

.addComponent(lblGanador, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE)))

.addContainerGap(19, Short.MAX_VALUE))

);

layout.setVerticalGroup(

layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(33, 33, 33)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(9, 9, 9)

.addComponent(jLabel1))

.addComponent(pg1, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(18, 18, 18)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(9, 9, 9)

.addComponent(jLabel2))

.addComponent(pg2, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(18, 18, 18)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(9, 9, 9)

.addComponent(jLabel3))

.addComponent(pg3, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))

.addGap(18, 18, 18)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

.addGroup(layout.createSequentialGroup()

.addGap(9, 9, 9)

.addComponent(jLabel4))

.addComponent(pg4, javax.swing.GroupLayout.PREFERRED_SIZE, 40, javax.swing.GroupLayout.PREFERRED_SIZE))

.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 20, Short.MAX_VALUE)

.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)

.addComponent(jLabel5, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

.addComponent(lblGanador, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

.addGap(18, 18, 18)

.addComponent(btnIniciar, javax.swing.GroupLayout.PREFERRED_SIZE, 45, javax.swing.GroupLayout.PREFERRED_SIZE)

.addGap(34, 34, 34))

);

pack();

}// //GEN-END:initComponents

private void btnIniciarActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnIniciarActionPerformed

this.btnIniciar.setEnabled(false);

this.lblGanador.setText("");

for (int i = 0; i < hilos.length; i++) {

Caballo c = new Caballo((i+1)+"");

c.addObserver(this);

hilos[i] = new Thread(c);

hilos[i].start();

}

}//GEN-LAST:event_btnIniciarActionPerformed

private void terminar(){

for (int i = 0; i < hilos.length; i++) {

hilos[i].interrupt();

}

/**

* @param args the command line arguments

public static void main(String args[]) {

/* Set the Nimbus look and feel */

/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.

* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html

try {

for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {

if ("Nimbus".equals(info.getName())) {

javax.swing.UIManager.setLookAndFeel(info.getClassName());

break;

}

} catch (ClassNotFoundException ex) {

java.util.logging.Logger.getLogger(FrmCarrera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (InstantiationException ex) {

java.util.logging.Logger.getLogger(FrmCarrera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (IllegalAccessException ex) {

java.util.logging.Logger.getLogger(FrmCarrera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (javax.swing.UnsupportedLookAndFeelException ex) {

java.util.logging.Logger.getLogger(FrmCarrera.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

}

/* Create and display the form */

java.awt.EventQueue.invokeLater(new Runnable() {

public void run() {

new FrmCarrera().setVisible(true);

}

});

}

// Variables declaration - do not modify//GEN-BEGIN:variables

private javax.swing.JButton btnIniciar;

private javax.swing.JLabel jLabel1;

private javax.swing.JLabel jLabel2;

private javax.swing.JLabel jLabel3;

private javax.swing.JLabel jLabel4;

private javax.swing.JLabel jLabel5;

private javax.swing.JLabel lblGanador;

private javax.swing.JProgressBar pg1;

private javax.swing.JProgressBar pg2;

private javax.swing.JProgressBar pg3;

private javax.swing.JProgressBar pg4;

// End of variables declaration//GEN-END:variables

@Override

public void update(Observable o, Object arg) {

Caballo c = (Caballo) o;

int porcentaje = (int) arg;

switch (c.getNombre()) {

case "1":

this.pg1.setValue(porcentaje);

break;

case "2":

this.pg2.setValue(porcentaje);

break;

case "3":

this.pg3.setValue(porcentaje);

break;

case "4":

this.pg4.setValue(porcentaje);

break;

}

if(porcentaje>=100){

terminar();

this.btnIniciar.setEnabled(true);

this.lblGanador.setText("Caballo "+c.getNombre());

}

Caballo.java

package ejercicio_thread_ddr_4;

import java.util.Observable;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Caballo extends Observable implements Runnable {

    private String nombre;

    public Caballo(String nombre) {
        this.nombre = nombre;
    }

    public String getNombre() {
        return nombre;
    }

    @Override
    public void run() {

        int porcentaje = 0;
        int numAleatorio;
        try {
            while (porcentaje < 100) {
                numAleatorio = generaNumeroAleatorio(1, 15);
                System.out.println("Caballo " + nombre + " ha aumentado en " + numAleatorio);
                porcentaje += numAleatorio;

                this.setChanged();
                this.notifyObservers(porcentaje);
                this.clearChanged();

                Thread.sleep(1000);

            }
        } catch (InterruptedException ex) {
            System.out.println("Hilo interrumpido");
        }

    }

    public static int generaNumeroAleatorio(int minimo, int maximo) {
        int num = (int) Math.floor(Math.random() * (maximo - minimo + 1) + (minimo));
        return num;
    }

}

package ejercicio_thread_ddr_4;

import java.util.Observable;

import java.util.logging.Level;

import java.util.logging.Logger;

public class Caballo extends Observable implements Runnable {

private String nombre;

public Caballo(String nombre) {

this.nombre = nombre;

}

public String getNombre() {

return nombre;

}

@Override

public void run() {

int porcentaje = 0;

int numAleatorio;

try {

while (porcentaje < 100) {

numAleatorio = generaNumeroAleatorio(1, 15);

System.out.println("Caballo " + nombre + " ha aumentado en " + numAleatorio);

porcentaje += numAleatorio;

this.setChanged();

this.notifyObservers(porcentaje);

this.clearChanged();

Thread.sleep(1000);

}

} catch (InterruptedException ex) {

System.out.println("Hilo interrumpido");

}

public static int generaNumeroAleatorio(int minimo, int maximo) {

int num = (int) Math.floor(Math.random() * (maximo - minimo + 1) + (minimo));

return num;

}

Espero que os sea de ayuda.

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Joseph 10/01/2020

Tengo dudas
leer datos

Leer los datos de las ventas que se realizan al concesionario, las que provienen de una secuencia de números naturales leída desde teclado. Los valores leídos corresponden a los códigos de los clientes del concesionario. La secuencia termina en 0, valor que no hay que tener en cuenta como código de cliente.

Hacer un algoritmo llamado LlegirDades que lea estos datos, las guarde en un array y, a continuación, obtenga el código del cliente que aparece más veces (aquel al que se han vendido más coches). Si hay más de un cliente que es el más repetido, indicar el primero que se encuentre.
Hay que tener presente que el número máximo de valores que se pueden almacenar es 1.000.
juan 22/09/2021

Considera que estás desarrollando una web para una empresa que fabrica motores
(suponemos que se trata del tipo de motor de una bomba para mover fluidos).
Definir una variable tipoMotor y permitir que el usuario ingrese un valor entre 1 y 4.
El programa debe mostrar lo siguiente:

o Si el tipo de motor es 1, mostrar un mensaje indicando “La bomba es una
bomba de agua”.

o Si el tipo de motor es 2, mostrar un mensaje indicando “La bomba es una
bomba de gasolina”.

o Si el tipo de motor es 3, mostrar un mensaje indicando “La bomba es una
bomba de hormigón”.

o Si el tipo de motor es 4, mostrar un mensaje indicando “La bomba es una
bomba de pasta alimenticia”.

o Si no se cumple ninguno de los valores anteriores mostrar el mensaje “No
existe un valor válido para tipo de bomba”

Ejercicios propuestos y resueltos Java Threads

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