Java AWT Calculadora
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En esta práctica vamos a crear una sencilla calculadora utilizando el framework AWT (Abstract Window Toolkit) de Java.
![//--- Métodos de la interfaz KeyListener ---
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
}
TestCalculadora.java
public class TestCalculadora {
public static void main(String[] args) {
// TODO Auto-generated method stub
Calculadora c = new Calculadora();
//c.pack();
c.setVisible(true);
}
}
bitCoach::Juan Bautista Cascallar Lorenzo](https://image.slidesharecdn.com/javaawtcalculadora-110618143037-phpapp02/85/Java-AWT-Calculadora-3-320.jpg)
Java AWT Calculadora
- 1. En esta práctica vamos a crear una sencilla calculadora utilizando el framework AWT (Abstract Window Toolkit) de Java. Etiquetas: Frame, Panel, paquete AWT, Gestión de eventos, Notificador, Listener, interfaces y adaptadores, ActionListener, WindowAdapter,… Escuchador_WindowListener.java import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; public class Escuchador_WindowListener extends WindowAdapter { public void windowClosing(WindowEvent evento){ System.exit(0); } } Calculadora.java import java.awt.BorderLayout; import java.awt.Color; import java.awt.Frame; import java.awt.TextField; import java.awt.Panel; import java.awt.GridLayout; import java.awt.Button; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; public class Calculadora extends Frame implements ActionListener,KeyListener{ private static final long serialVersionUID = 1L; private TextField pantalla = null; private Button tecla = null; private int operando1 = 0; private int operando2 = 0; private String operacion = null; private boolean newDigitBlock = true; bitCoach::Juan Bautista Cascallar Lorenzo
- 2. //Constructor public Calculadora(){ this.setTitle("Calculadora"); this.setSize(200, 200); this.setLayout(new BorderLayout()); this.addWindowListener(new Escuchador_WindowListener()); //--- Display --- pantalla = new TextField(); pantalla.setText("0"); pantalla.addKeyListener(this); pantalla.setBackground(Color.CYAN); this.add(pantalla,BorderLayout.NORTH); //--- Teclas --- Panel panel01 = new Panel(); panel01.setLayout(new GridLayout(5,3)); tecla = new Button("0"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("1"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("+"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("2"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("3"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("-"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("4"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("5"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("="); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("6"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("7"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("C"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("8"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button("9"); tecla.addActionListener(this); panel01.add(tecla); tecla = new Button(); tecla.setEnabled(false); panel01.add(tecla); this.add(panel01,BorderLayout.CENTER); } //--- Método de la interfaz ActionListener --- @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub String teclaPulsada = ((Button)e.getSource()).getLabel(); if(teclaPulsada.equals("C")){ pantalla.setText("0"); operando1 = 0; operando2 = 0; newDigitBlock = true; }else if(teclaPulsada.equals("=")){ operando2 = Integer.parseInt(pantalla.getText()); if(operacion != null){ if(operacion.equals("+")){ pantalla.setText(new Integer(operando1 + operando2).toString()); }else if (operacion.equals("-")){ pantalla.setText(new Integer(operando1 - operando2).toString()); } } newDigitBlock = true; operacion = null; }else if(teclaPulsada.equals("+") || teclaPulsada.equals("-")){ operacion = teclaPulsada; operando1 = Integer.parseInt(pantalla.getText()); newDigitBlock = true; }else{ if(newDigitBlock == true){ pantalla.setText(teclaPulsada); newDigitBlock = false; }else{ pantalla.setText(pantalla.getText() + teclaPulsada); //--- Quitar 0 al principio --- if((pantalla.getText().length() > 1) && (pantalla.getText().charAt(0) == '0')){ pantalla.setText(pantalla.getText().substring(1)); } } } }//Fin function bitCoach::Juan Bautista Cascallar Lorenzo
- 3. //--- Métodos de la interfaz KeyListener --- @Override public void keyTyped(KeyEvent e) { // TODO Auto-generated method stub } @Override public void keyPressed(KeyEvent e) { // TODO Auto-generated method stub } @Override public void keyReleased(KeyEvent e) { // TODO Auto-generated method stub } } TestCalculadora.java public class TestCalculadora { public static void main(String[] args) { // TODO Auto-generated method stub Calculadora c = new Calculadora(); //c.pack(); c.setVisible(true); } } bitCoach::Juan Bautista Cascallar Lorenzo