Without Book Hacer una pregunta
Review the question and existing answers carefully before replying. The best answers explain the reasoning, steps, and tradeoffs so other learners can benefit too.
Pregunta. Please give me a source code example that makes a calculator on java. awt or swing anything can be given.
- Please give me a source code example that makes a calculator on java. awt or swing anything can be given.
Publicado el Sep 28, 2010 Publicado por Om
Respuesta.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CalculatorPanel extends JPanel
implements ActionListener
{ public CalculatorPanel()
{ setLayout(new BorderLayout());
display = new JTextField("0");
display.setEditable(false);
add(display, "North");
JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));
String buttons = "789/456*123-0.=+";
for (int i = 0; i < buttons.length(); i++)
addButton(p, buttons.substring(i, i + 1));
add(p, "Center");
}
private void addButton(Container c, String s)
{ JButton b = new JButton(s);
c.add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent evt)
{ String s = evt.getActionCommand();
if ('0' <= s.charAt(0) && s.charAt(0) <= '9'
'' s.equals("."))
{ if (start) display.setText(s);<
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CalculatorPanel extends JPanel
implements ActionListener
{ public CalculatorPanel()
{ setLayout(new BorderLayout());
display = new JTextField("0");
display.setEditable(false);
add(display, "North");
JPanel p = new JPanel();
p.setLayout(new GridLayout(4, 4));
String buttons = "789/456*123-0.=+";
for (int i = 0; i < buttons.length(); i++)
addButton(p, buttons.substring(i, i + 1));
add(p, "Center");
}
private void addButton(Container c, String s)
{ JButton b = new JButton(s);
c.add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent evt)
{ String s = evt.getActionCommand();
if ('0' <= s.charAt(0) && s.charAt(0) <= '9'
'' s.equals("."))
{ if (start) display.setText(s);<
Publicado el Sep 28, 2010 Publicado por Arindam Ghosh