、使用JAVA语言编写一个简易的计算器

我写了个整数可以使用的, 你可以研究一下, 添入小数部分
功能和window7自带的那个一样

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.LineBorder;

public class Caculator extends JFrame {
private JLabel r1;
private JLabel r2;
private int tempResult;
boolean isResult;
private String lastOperator;

public Caculator() {
isResult = true;
tempResult = 0;
lastOperator = "+";
JPanel jp_main = new JPanel();
jp_main.setLayout(new BorderLayout());
JPanel jp_show = new JPanel();
jp_show.setBorder(new LineBorder(java.awt.Color.black));
jp_show.setLayout(new GridLayout(2, 1));
r1 = new JLabel("0", JLabel.RIGHT);
r2 = new JLabel("0", JLabel.RIGHT);
jp_show.add(r1);
jp_show.add(r2);
JPanel jp_button = new JPanel();
jp_button.setBorder(new LineBorder(java.awt.Color.black));
jp_button.setLayout(new GridLayout(4, 4));
JButton one = new JButton("1");
JButton two = new JButton("2");
JButton three = new JButton("3");
JButton four = new JButton("4");
JButton five = new JButton("5");
JButton six = new JButton("6");
JButton seven = new JButton("7");
JButton eight = new JButton("8");
JButton nine = new JButton("9");
JButton zero = new JButton("0");
JButton dot = new JButton(".");
JButton plus = new JButton("+");
JButton sub = new JButton("-");
JButton multi = new JButton("*");
JButton divide = new JButton("/");
JButton result = new JButton("=");
jp_button.add(one);
jp_button.add(two);
jp_button.add(three);
jp_button.add(sub);
jp_button.add(four);
jp_button.add(five);
jp_button.add(six);
jp_button.add(multi);
jp_button.add(seven);
jp_button.add(eight);
jp_button.add(nine);
jp_button.add(divide);
jp_button.add(zero);
jp_button.add(dot);
jp_button.add(plus);
jp_button.add(result);
JPanel reset = new JPanel();
reset.setBorder(new LineBorder(java.awt.Color.black));
JButton rb = new JButton("重置");
rb.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
r1.setText("0");
r2.setText("0");
isResult = true;
tempResult = 0;
lastOperator = "+";
}
});
reset.add(rb);
jp_main.add(jp_show, BorderLayout.NORTH);
jp_main.add(jp_button, BorderLayout.CENTER);
jp_main.add(reset, BorderLayout.SOUTH);
this.add(jp_main);
one.addActionListener(new NumberButtonListener());
two.addActionListener(new NumberButtonListener());
three.addActionListener(new NumberButtonListener());
four.addActionListener(new NumberButtonListener());
five.addActionListener(new NumberButtonListener());
six.addActionListener(new NumberButtonListener());
seven.addActionListener(new NumberButtonListener());
eight.addActionListener(new NumberButtonListener());
nine.addActionListener(new NumberButtonListener());
zero.addActionListener(new NumberButtonListener());
// dot.addActionListener(new NumberButtonListener());
plus.addActionListener(new OperatorButtonListener());
sub.addActionListener(new OperatorButtonListener());
multi.addActionListener(new OperatorButtonListener());
divide.addActionListener(new OperatorButtonListener());
result.addActionListener(new ResultButtonListener());

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setSize(370, 280);
this.setResizable(false);
this.setLocationRelativeTo(null);

}

private class NumberButtonListener implements ActionListener {

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
JButton jb = (JButton) arg0.getSource();
String temp = r2.getText();
if (!isResult) {
if (temp.equals("0")) {
r2.setText(jb.getText());
} else {
r2.setText(temp + jb.getText());
}
} else {
r2.setText(jb.getText());
}
isResult = false;
}
}

private class ResultButtonListener implements ActionListener{

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
r1.setText("0");
new OperatorButtonListener().caculate(new JButton("+"));
r2.setText(String.valueOf(tempResult));
isResult = true;
tempResult = 0;
lastOperator = "+";
}
}

private class OperatorButtonListener implements ActionListener {

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
JButton jb = (JButton) arg0.getSource();
String temp1 = r1.getText();
if (temp1.equals("0")) {
r1.setText(r2.getText() + " " + jb.getText());
caculate(jb);

} else {
r1.setText(temp1 + " " + r2.getText() + " " + jb.getText());
caculate(jb);
r2.setText(String.valueOf(tempResult));

}
isResult = true;
}

public void caculate(JButton jb){
if(lastOperator.equals("+")){
tempResult += Integer.valueOf(r2.getText());
}else if(lastOperator.equals("-")){
tempResult -= Integer.valueOf(r2.getText());
}else if(lastOperator.equals("*")){
tempResult *= Integer.valueOf(r2.getText());
}else if(lastOperator.equals("/")){
tempResult /= Integer.valueOf(r2.getText());
}
lastOperator = jb.getText();
}

}
}

下面是main函数
public class Test {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Caculator c = new Caculator();
}

}

你运行就可以看到效果本回答被提问者和网友采纳

用swing就OK了，自己学还等着别人给你现成的啊?

布局不是最重要的，重要的是你要理解编程的思想。上面的功能其实很简单吧，不过多新手来说，能做好，说明你的基本功还是不错的

计算器 , 很简单的, 不过想写个没bug的 易于使用的还是需要花费不少心思. 学学Swing就ok了