关于计算器！！！！！

[incompletewild]

作计算器的时候点1的时候 空白处显示1 再点2的时候显示12
点加减乘除时清空
输入下一个数
然后只执行加减乘除
问题就是 我只能让它点1的时候显示1 再点2的时候 显示成了2
我不知到怎么才能点2的时候 显示成12 并且储存起来用于计算
关于这段代码有谁知道吗？

[incompletewild]

代码片断 就是点1的时候显示1点2的时候显示2不能顺序显示最关键的是运算
public void jButton1_actionPerformed(ActionEvent e) {

jTextField1.setText("1");

}

public void jButton2_actionPerformed(ActionEvent e) {
jTextField1.setText("2");
}

public void jButton3_actionPerformed(ActionEvent e) {
jTextField1.setText("3");
}

public void jButton4_actionPerformed(ActionEvent e) {
jTextField1.setText("4");
}

[zephyr_cc]

简单的计算器代码...
主要看看
private class InsertAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String input = event.getActionCommand();
if (start)
{
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}

--------------------------------------------------------------------------------

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class Calculator
{
public static void main(String[] args)
{
CalculatorFrame frame = new CalculatorFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}

/**
A frame with a calculator panel.
*/
class CalculatorFrame extends JFrame
{
public CalculatorFrame()
{
setTitle("Calculator");
CalculatorPanel panel = new CalculatorPanel();
add(panel);
pack();
}
}

/**
A panel with calculator buttons and a result display.
*/
class CalculatorPanel extends JPanel
{
public CalculatorPanel()
{
setLayout(new BorderLayout());

result = 0;
lastCommand = "=";
start = true;

// add the display

display = new JButton("0");
display.setEnabled(false);
add(display, BorderLayout.NORTH);

ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();

// add the buttons in a 4 x 4 grid

panel = new JPanel();
panel.setLayout(new GridLayout(4, 4));

addButton("7", insert);
addButton("8", insert);
addButton("9", insert);
addButton("/", command);

addButton("4", insert);
addButton("5", insert);
addButton("6", insert);
addButton("*", command);

addButton("1", insert);
addButton("2", insert);
addButton("3", insert);
addButton("-", command);

addButton("0", insert);
addButton(".", insert);
addButton("=", command);
addButton("+", command);

add(panel, BorderLayout.CENTER);
}

/**
Adds a button to the center panel.
@param label the button label
@param listener the button listener
*/
private void addButton(String label, ActionListener listener)
{
JButton button = new JButton(label);
button.addActionListener(listener);
panel.add(button);
}

/**
This action inserts the button action string to the
end of the display text.
*/
private class InsertAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String input = event.getActionCommand();
if (start)
{
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}

/**
This action executes the command that the button
action string denotes.
*/
private class CommandAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String command = event.getActionCommand();

if (start)
{
if (command.equals("-"))
{
display.setText(command);
start = false;
}
else
lastCommand = command;
}
else
{
calculate(Double.parseDouble(display.getText()));
lastCommand = command;
start = true;
}
}
}

/**
Carries out the pending calculation.
@param x the value to be accumulated with the prior result.
*/
public void calculate(double x)
{
if (lastCommand.equals("+")) result += x;
else if (lastCommand.equals("-")) result -= x;
else if (lastCommand.equals("*")) result *= x;
else if (lastCommand.equals("/")) result /= x;
else if (lastCommand.equals("=")) result = x;
display.setText("" + result);
}

private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
}

[qybao]

public void jButton1_actionPerformed(ActionEvent e) {

jTextField1.setText("1"); -> jTextField1.setText(jTextField1.getText()+"1");

}

[yuzhlhua]

按数字是字符串的连接，删数字的字符串的截取，计算是把字符变成数字，计算后在变会字符。