Teste

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  • Publicado : 23 de agosto de 2012
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator extends JPanel implements ActionListener {
GridBagConstraints gbc = new GridBagConstraints( );JTextField theDisplay = new JTextField( );

public Calculator( ) {
gbc.weightx = 1.0; gbc.weighty = 1.0;
gbc.fill = GridBagConstraints.BOTH;
ContainerListener listener = newContainerAdapter( ) {
public void componentAdded(ContainerEvent e) {
Component comp = e.getChild( );
if (comp instanceof JButton)((JButton)comp).addActionListener(Calculator.this);
}
};
addContainerListener(listener);
gbc.gridwidth = 4;
addGB(this, theDisplay, 0, 0);
// make the top row
JPanel topRow = new JPanel( );topRow.addContainerListener(listener);
gbc.gridwidth = 1;
gbc.weightx = 1.0;
addGB(topRow, new JButton("C"), 0, 0);
gbc.weightx = 0.33;
addGB(topRow, new JButton("%"), 1, 0);gbc.weightx = 1.0;
addGB(topRow, new JButton("+"), 2, 0 );
gbc.gridwidth = 4;
addGB(this, topRow, 0, 1);
gbc.weightx = 1.0; gbc.gridwidth = 1;
// make the digits
for(intj=0; j<3; j++)
for(int i=0; i<3; i++)
addGB(this, new JButton("" + ((2-j)*3+i+1) ), i, j+2);
// -, x, and divide
addGB(this, new JButton("-"), 3, 2);addGB(this, new JButton("x"), 3, 3);
addGB(this, new JButton("u00F7"), 3, 4);
// make the bottom row
JPanel bottomRow = new JPanel( );
bottomRow.addContainerListener(listener);gbc.weightx = 1.0;
addGB(bottomRow, new JButton("0"), 0, 0);
gbc.weightx = 0.33;
addGB(bottomRow, new JButton("."), 1, 0);
gbc.weightx = 1.0;
addGB(bottomRow, new JButton("="),2, 0);
gbc.gridwidth = 4;
addGB(this, bottomRow, 0, 5);
}

void addGB(Container cont, Component comp, int x, int y) {
if ((cont.getLayout( ) instanceof GridBagLayout) == false)...
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