java 编写的计算器源代码.doc

Java Swing 编写计算器 源代码 import java.awt.Button; import java.awt.Color; import java.awt.Frame; import java.awt.GridLayout; import java.awt.Panel; import java.awt.TextField; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; import javax.swing.JTextField; public class Counter extends Frame { // 声明三个面板的布局 GridLayout gl1, gl2, gl3,gl4; Panel p0, p1, p2, p3,p4; JTextField tf1; TextField tf2; Button b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14,b15, b16, b17, b18, b19, b20, b21, b22, b23, b24, b25, b26,b27,b28,b29,b30; StringBuffer str;// 显示屏所显示的字符串 double x, y;// x和y都是运算数 double sum=0;//加和 double mul=1;//乘积 double sub=0;//减差 令其为输入的第一个值 double dev;//除商 令其为输入的第一个值 boolean tag= true; boolean tag1= true; int z = -1,k;// Z表示单击了那一个运算符.0表示+,1表示-,2表示*,3表示/ static double m ;// 记忆的数字 public Counter() { gl1 = new GridLayout(1, 4, 10, 0);// 实例化三个面板的布局 gl2 = new GridLayout(4, 1, 0, 15); gl3 = new GridLayout(4, 5, 10, 15); gl4 = new GridLayout(1, 4, 10, 0); tf1 = new JTextField(27);// 显示屏 tf1.setHorizontalAlignment(JTextField.RIGHT); //tf1.setEnabled(false); //tf1.setEditable(false); tf1.setText(0); tf1.addKeyListener(new Tt()); tf2 = new TextField(10);// 显示记忆的索引值 tf2.setEditable(false); // 实例化所有按钮、设置其前景色并注册监听器 b0 = new Button(Backspace); b0.setForeground(Color.red); b0.addActionListener(new Bt()); b1 = new Button(CE); b1.setForeground(Color.red); b1.addActionListener(new Bt()); b2 = new Button(C); b2.setForeground(Color.red); b2.addActionListener(new Bt()); b3 = new Button(MC); b3.setForeground(Color.red); b3.addActionListener(new Bt()); b4 = new Button(MR); b4.setForeground(Color.red); b4.addActionListener(new Bt()); b5 = new Button(MS); b5.setForeground(Color.red)