Java Thread Cronometro

En esta práctica vamos a implementar un cronómetro con horas, minutos y segundos. Los dígitos son imágenes.

El cronómetro tiene dos botones:

o Un botón para arrancar y pausar.

o Un botón para reiniciar todo a cero.

FrameListener.java

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class FrameListener extends WindowAdapter {

public void windowClosing(WindowEvent e){
System.exit(0);
}
}

bitCoach::Juan Bautista Cascallar Lorenzo

CronometroThread.java

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JLabel;

public class CronometroThread extends JPanel implements Runnable, ActionListener {

private static final long serialVersionUID = 3287496534931916605L;

//Atributos
Thread crono_hilo = null;

private boolean sw = true;
private boolean detenido = true;

private int horas = 0;
private int minutos = 0;
private int segundos = 0;

JLabel[] lbl_digitos = null;

JLabel etiqueta = null;

char[] crono = {'0','0',':','0','0',':','0','0'};

//Constructor
public CronometroThread(){

lbl_digitos = new JLabel [8];

this.setLayout(null);
this.setBounds(10, 10, 300, 140);

for(int i = 0; i < lbl_digitos.length; i++) {
lbl_digitos[i] = new JLabel();
this.add(lbl_digitos[i]);
}

mostrarInfoCrono();

JButton btn_arrancar_parar = new JButton("Arrancar/Parar");
btn_arrancar_parar.setName("btn_arrancar_parar");
btn_arrancar_parar.addActionListener(this);
btn_arrancar_parar.setBounds(20,50,120,20);
this.add(btn_arrancar_parar);

JButton btn_reiniciar = new JButton("Reiniciar");
btn_reiniciar.setName("btn_reiniciar");
btn_reiniciar.addActionListener(this);
btn_reiniciar.setBounds(150,50,110,20);
this.add(btn_reiniciar);

crono_hilo = new Thread(this);
crono_hilo.start();

}


private void mostrarInfoCrono(){

for(int i = 0; i < lbl_digitos.length; i++) {
if(crono[i] != ':'){
lbl_digitos[i].setIcon(new ImageIcon("imagenes/" + crono[i] + ".gif"));
lbl_digitos[i].setBounds(70 + (i*13), 10, 13, 23);
}else{
lbl_digitos[i].setIcon(new ImageIcon("imagenes/separador.gif"));
lbl_digitos[i].setBounds(70 + (i*13), 10, 13, 23);
}
}
}

@Override
public void run() {
// TODO Auto-generated method stub

StringBuffer tmp;

while(sw == true){
try {
if(detenido == false){
mostrarInfoCrono();
Thread.sleep(1000);
segundos++;
//Calculamos los valores
if(segundos == 60){
segundos = 0; minutos++;
if(minutos == 60){
minutos = 0; horas++;
if(horas == 24){ horas = 0; }
}
}

//Formatear la hora
tmp = new StringBuffer(8);

if(horas < 10){tmp.append('0');}
tmp.append(horas); tmp.append(':');
if(minutos < 10){tmp.append('0');}
tmp.append(minutos); tmp.append(':');
if(segundos < 10){tmp.append('0');}

tmp.append(segundos);
//System.out.println(tmp.toString());
crono = tmp.toString().toCharArray();

}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}


//--- EVENTOS ---
@Override
public void actionPerformed(ActionEvent arg0) {
Object control = arg0.getSource();

if(control instanceof JButton){
if(((JButton) control).getName().equals("btn_arrancar_parar")){
if(detenido == true){
detenido = false;
}else{
detenido = true;
}
}

if(((JButton) control).getName().equals("btn_reiniciar")){
detenido = true;

horas = 0;
minutos = 0;
segundos = 0;

for(int i = 0; i < crono.length; i++){
if((i==2) || (i==5)){
crono[i] = ':';
}else{
crono[i] = '0';
}
}

mostrarInfoCrono();
}
}

}

}

TestCronometro.java

import javax.swing.JFrame;

public class TestCronometro {

private static CronometroThread cr = null;

public static void main(String[] args) {

JFrame frame = new JFrame("Prueba del componente cronómetro");
frame.setLayout(null);
frame.addWindowListener(new FrameListener());
frame.setBounds(0,0,300,140);
cr = new CronometroThread();
frame.add(cr);
frame.setVisible(true);

}

}


Java Thread Cronometro

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