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);b5.addActionListener(new Bt();b6 = new Button(M+);b6.setForeground(Color.red);b6.addActionListener(new Bt();b7 = new Button(7);b7.setForeground(Color.blue);b7.addActionListener(new Bt();b8 = new Button(8);b8.setForeground(Color.blue);b8.addActionListener(new Bt();b9 = new Button(9);b9.setForeground(Color.blue);b9.addActionListener(new Bt();b10 = new Button(/);b10.setForeground(Color.red);b10.addActionListener(new Bt();b11 = new Button(sqrt);b11.setForeground(Color.blue);b11.addActionListener(new Bt();b12 = new Button(4);b12.setForeground(Color.blue);b12.addActionListener(new Bt();b13 = new Button(5);b13.setForeground(Color.blue);b13.addActionListener(new Bt();b14 = new Button(6);b14.setForeground(Color.blue);b14.addActionListener(new Bt();b15 = new Button(*);b15.setForeground(Color.red);b15.addActionListener(new Bt();b16 = new Button(%);b16.setForeground(Color.blue);b16.addActionListener(new Bt();b17 = new Button(1);b17.setForeground(Color.blue);b17.addActionListener(new Bt();b18 = new Button(2);b18.setForeground(Color.blue);b18.addActionListener(new Bt();b19 = new Button(3);b19.setForeground(Color.blue);b19.addActionListener(new Bt();b20 = new Button(-);b20.setForeground(Color.red);b20.addActionListener(new Bt();b21 = new Button(1/x);b21.setForeground(Color.blue);b21.addActionListener(new Bt();b22 = new Button(0);b22.setForeground(Color.blue);b22.addActionListener(new Bt();b23 = new Button(+/-);b23.setForeground(Color.blue);b23.addActionListener(new Bt();b24 = new Button(.);b24.setForeground(Color.blue);b24.addActionListener(new Bt();b25 = new Button(+);b25.setForeground(Color.red);b25.addActionListener(new Bt();b26 = new Button(=);b26.setForeground(Color.red);b26.addActionListener(new Bt();b27 = new Button(sin);b27.setForeground(Color.pink);b27.addActionListener(new Bt();b28 = new Button(cos);b28.setForeground(Color.pink);b28.addActionListener(new Bt();b29 = new Button(tan);b29.setForeground(Color.pink);b29.addActionListener(new Bt();b30 = new Button(log);b30.setForeground(Color.pink);b30.addActionListener(new Bt();/ 实例化四个面板p0 = new Panel();p1 = new Panel();p2 = new Panel();p3 = new Panel();p4 = new Panel();/ 创建一个空字符串缓冲区str = new StringBuffer();/ 添加面板p0中的组件和设置其在框架中的位置和大小p0.add(tf1);p0.setBounds(10, 25, 300, 40);/ 添加面板p1中的组件和设置其在框架中的位置和大小p1.setLayout(gl1);p1.add(tf2);p1.add(b0);p1.add(b1);p1.add(b2);p1.setBounds(10, 65, 300, 25);/ 添加面板p2中的组件并设置其的框架中的位置和大小p2.setLayout(gl2);p2.add(b3);p2.add(b4);p2.add(b5);p2.add(b6);p2.setBounds(10, 110, 40, 150);/ 添加面板p3中的组件并设置其在框架中的位置和大小p3.setLayout(gl3);/ 设置p3的布局p3.add(b7);p3.add(b8);p3.add(b9);p3.add(b10);p3.add(b11);p3.add(b12);p3.add(b13);p3.add(b14);p3.add(b15);p3.add(b16);p3.add(b17);p3.add(b18);p3.add(b19);p3.add(b20);p3.add(b21);p3.add(b22);p3.add(b23);p3.add(b24);p3.add(b25);p3.add(b26);p3.setBounds(60, 110, 250, 150);/ 添加面板p4中的组件和设置其在框架中的位置和大小p4.setLayout(gl4);p4.add(b27);p4.add(b28);p4.add(b29);p4.add(b30);p4.setBounds(28, 270, 250, 30);/ 设置框架中的布局为空布局并添加4个面板setLayout(null);add(p0);add(p1);add(p2);add(p3);add(p4);setTitle(计算器);setResizable(false);/ 禁止调整框架的大小/ 匿名类关闭窗口addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e1) System.exit(0););setBackground(Color.lightGray);setBounds(100, 100, 320, 320);setVisible(true);/ 构造监听器class Bt implements ActionListener /z：0表示+,1表示-,2表示*,3表示/public double ttt( )switch( z )case 0:sum = sum + y;y = sum;break;case 1:sub = sub - y;y = sub;break;case 2:mul = mul * y;y = mul;break;case 3:dev = dev / y;y = dev;break;return y;public void actionPerformed(ActionEvent e2) try if (e2.getSource() = b1)/ 选择CE清零 tag = true; tag1 = true;tf1.setText(0);/ 把显示屏清零str.setLength(0);/ 清空字符串缓冲区以准备接收新的输入运算数 else if (e2.getSource() = b2)/ 选择C清零 tag = true; tag1 = true;tf1.setText(0);/ 把显示屏清零str.setLength(0); else if (e2.getSource() = b23)/ 单击+/-选择输入的运算数是正数还是负数x = Double.parseDouble(tf1.getText().trim();tf1.setText( + (-x); else if (e2.getSource() = b27)/ 求sinx = Double.parseDouble(tf1.getText().trim(); tf1.setText( + Math.sin(x);str.setLength(0);y = 0d;else if (e2.getSource() = b28)/ 求cosx = Double.parseDouble(tf1.getText().trim(); tf1.setText( + Math.cos(x);str.setLength(0);y = 0d;else if (e2.getSource() = b29)/ 求tanx = Double.parseDouble(tf1.getText().trim(); tf1.setText( + Math.tan(x);str.setLength(0);y = 0d;else if (e2.getSource() = b30)/ 求logx = Double.parseDouble(tf1.getText().trim();if (x = 0) tf1.setText(此函数无效); else tf1.setText( + Math.log(x);str.setLength(0);y = 0d; else if (e2.getSource() = b25)/ 单击加号按钮获得x的值和z的值并清空y的值 if ( z = 0 | z = -1 )x = y; sum = sum + x;elsesum = this.ttt( );str.setLength(0);/ 清空缓冲区以便接收新的另一个运算数 tf1.setText( + sum); z = 0; else if (e2.getSource() = b20)/ 单击减号按钮获得x的值和z的值并清空y的值if ( z = 1 | z = -1 )x = y;if(tag = true)sub = x;tag = false;elsesub = sub - x;elsesub = this.ttt( );str.setLength(0);z = 1;tf1.setText( + sub); else if (e2.getSource() = b15)/ 单击乘号按钮获得x的值和z的值并清空y的值if(z = 2 |z = -1)x = y;mul = mul * x;elsemul = this.ttt( );str.setLength(0);tf1.setText( + mul);z = 2; else if (e2.getSource() = b10)/ 单击除号按钮获得x的值和z的值并空y的值if(z = 3 |z = -1)x = y;if(tag1 = true)dev = x;tag1 = false;elseif(x=0)tf1.setText(除数不能为零);elsedev = dev / x;elsedev = this.ttt( );str.setLength(0);tf1.setText( + dev);z = 3; else if (e2.getSource() = b26)/ 单击等号按钮输出计算结果str.setLength(0);switch (z) case 0:tf1.setText( + (sum + y);y = Double.parseDouble(tf1.getText().trim();sum=0;break;case 1:tf1.setText( + (sub -y);y = Double.parseDouble(tf1.getText().trim();sub=0;tag = true;break;case 2:tf1.setText( + (mul * y);y = Double.parseDouble(tf1.getText().trim();mul=0;break;case 3:if (y = 0) tf1.setText(除数不能为零); else tf1.setText( + (dev / y);y = Double.parseDouble(tf1.getText().trim();dev=0;tag1 = true;break; else if (e2.getSource() = b24)/ 单击.按钮输入小数if (tf1.getText().trim().indexOf(.) != -1)/ 判断字符串中是否已经包含了小数点 else/ 如果没数点有小if (tf1.getText().trim().equals(0)/ 如果初时显示为0str.setLength(0);/ System.out.println(str);tf1.setText(str.append(0 + e2.getActionCommand().toString(); else if (tf1.getText().trim().equals()/ 如果初时显示为空则不做任何操作 else tf1.setText(str.append(e2.getActionCommand().toString();y = 0d; else if (e2.getSource() = b11)/ 求平方根x = Double.parseDouble(tf1.getText().trim();tf1.setText(数字格式异常);if (x 0)tf1.setText(负数没有平方根);elsetf1.setText( + Math.sqrt(x);str.setLength(0);y = 0d; else if (e2.getSource() = b16)/ 单击了%按钮x = Double.parseDouble(tf1.getText().trim();tf1.setText( + (0.01 * x);str.setLength(0);y = 0d; else if (e2.getSource() = b21)/ 单击了1/X按钮x = Double.parseDouble(tf1.getText().trim();if (x = 0) tf1.setText(除数不能为零); else tf1.setText( + (1 / x);str.setLength(0);y = 0d; else if (e2.getSource() = b3)/ MC为清除内存m = 0d;tf2.setText();str.setLength(0); else if (e2.getSource() = b4)/ MR为重新调用存储的数据if (tf2.getText().trim() != )/ 有记忆数字tf1.setText( + m); else if (e2.getSource() = b5)/ MS为存储显示的数据m = Double.parseDouble(tf1.getText().trim();tf2.setText(M);tf1.setText(0);str.setLength(0); else if (e2.getSource() = b6)/ M+为将显示的数字与已经存储的数据相加要查看新的数字单击MRm = m + Double.parseDouble(tf1.getText().trim(); else/ 选择的是其他的按钮if (e2.getSource() = b22)/ 如果选择的是0这个数字键if (tf1.getText().trim().equals(0)/ 如果显示屏显示的为零