初学Java中的Swing,写了一个简单的计算器，和大家分享一下！

支持键盘和鼠标操作

支持多个数运算。例如：输入1+2+3，结果是6！

源代码：

import java.awt.*; import javax.swing.*; import java.awt.event.*; class GUI extends JFrame implements ActionListener,KeyListener { JTextField textField; private String strx = ""; private String stry =""; private String str =""; private String op=""; private String result=""; private int flag=1; private String strtemp; private float x; private float y; public GUI() { super(); this.setTitle("计算器"); this.setVisible(true); this.setBounds(800, 400, 280, 250); this.setResizable(true); this.addKeyListener(this); BorderLayout borLayout = new BorderLayout(); this.getContentPane().setLayout(borLayout); final JPanel viewpanel = new JPanel(); this.getContentPane().add(viewpanel, BorderLayout.NORTH); textField = new JTextField(); textField.setEditable(false); textField.setText("0"); textField.setHorizontalAlignment(SwingConstants.RIGHT); textField.setColumns(20); viewpanel.add(textField); final JPanel bottonPanel = new JPanel(); bottonPanel.setSize(200, 200); GridLayout gri = new GridLayout(4,0); gri.setHgap(10); gri.setVgap(10); bottonPanel.setLayout(gri); String[][] names ={

{"1","2","3","+"}, {"4","5","6","-"}, {"7","8","9","*"}, {".","0","=","/"} }; JButton[][] buttons = new JButton[4][4]; for(int i=0;i<4;i++) { for(int j=0;j<4;j++) { buttons[i][j] = new JButton(names[i][j]); buttons[i][j].setName(names[i][j]); buttons[i][j].setSize(40, 35); buttons[i][j].addActionListener(this); bottonPanel.add(buttons[i][j]); } } this.getContentPane().add(bottonPanel,BorderLayout.CENTER); final JLabel label1 = new JLabel(); label1.setPreferredSize(new Dimension(10,0)); this.getContentPane().add(label1,BorderLayout.WEST); final JButton button = new JButton("CE"); button.setName("CE"); button.addActionListener(this); this.getContentPane().add(button,BorderLayout.EAST); } public void calculate() { if(str!="") { System.out.println("strx == "+strx); System.out.println("stry == "+stry); try{ if(strx=="") { strx=strtemp; } x=Float.parseFloat(strx); y=Float.parseFloat(stry); }catch(Exception ex) { ex.printStackTrace(); } if(op=="+") { result = (x + y) + ""; } else if(op=="-") { result = (x - y) + ""; }else if(op=="*") { result = (x * y) + ""; }else { if(y==0) { result="ERROR"; } else{ result = (x / y) + ""; } } } } private void CaculateTemp() { if(op=="*"||op=="+"||op=="-"||op=="/") { calculate(); strx=result; str=result; stry=""; } } private void CE() { strx = ""; stry =""; str =""; op=""; result=""; flag=1; textField.setText("0"); } private void Cacu(String s) { if(s.equals("CE")) { CE(); } else if(s.equals("=")) { calculate(); textField.setText(result); strtemp=result; str=strtemp; stry=""; op=""; } else { if(s.equals("+")) { if(result!="") { str=result; strx=result; } CaculateTemp(); flag=0; op="+"; }else if(s.equals("-")) { if(result!="") { str=result; strx=result; } CaculateTemp(); flag=0; op="-"; }else if(s.equals("*")) { if(result!="") { str=result; strx=result; } CaculateTemp(); flag=0; op="*"; }else if(s.equals("/")) { if(result!="") { str=result; strx=result; } CaculateTemp(); flag=0; op="/"; }else { if(flag==1) { strx = strx + s; System.out.println("strx = "+strx); } if(flag==0) { stry = stry + s; System.out.println("stry = "+stry); } } str = str + s; System.out.println("str = "+str); textField.setText(str); } } public void actionPerformed(ActionEvent e) public void keyTyped(KeyEvent e) public void keyReleased(KeyEvent e) public void keyPressed(KeyEvent e) } public class JSQ { public static void main(String[] args) { GUI a = new GUI(); } }

经过本人多次调试，此程序中仍然存在问题。

1、不能先输入等号

2、不能连续输入多个操作符

3、进行每次运算的时候，都要先清零！

4、运行的时候，出现的窗口要先最小化，再打开，才能显示（不知道为什么）

5、支持键盘和鼠标操作，但是如果一用鼠标操作，就不能再用键盘操作了！（个人觉得，可能监听器加的位置有问题，但又不知道该加到那里可以让键盘，鼠标操作随意切换）

6、可能还有其他问题，所以此处略去n个字！！！！！！