求一个简单的JAVA计算器代码

求一个简单的JAVA计算器代码

import java.awt.*;import javax.swing.*;import java.awt.event.*;class Counter extends WindowAdapter{static JFrame f=new JFrame("计算器");static JTextField text1=new JTextField("0.");static String source="";static String cal="";static String object="";static boolean flag=false;static boolean flag1=true;static boolean flag2=false;public void init(){try{Container c=f.getContentPane();JPanel pan1=new JPanel();JButton b1=new JButton("1");JButton b2=new JButton("2");JButton b3=new JButton("3");JButton b4=new JButton("4");JButton b5=new JButton("5");JButton b6=new JButton("6");JButton b7=new JButton("7");JButton b8=new JButton("8");JButton b9=new JButton("9");JButton b0=new JButton("0");JButton b11=new JButton("+");JButton b12=new JButton("-");JButton b13=new JButton("*");JButton b14=new JButton("/");JButton b15=new JButton(".");JButton b16=new JButton("=");JButton bclar=new JButton("清零");text1.setHorizontalAlignment(JTextField.RIGHT);c.add(text1,"North");c.add(pan1);A aa=new A();Result re=new Result();Opertion op=new Opertion();Clar cl=new Clar();b1.addActionListener(aa);b2.addActionListener(aa);b3.addActionListener(aa);b4.addActionListener(aa);b5.addActionListener(aa);b6.addActionListener(aa);b7.addActionListener(aa);b8.addActionListener(aa);b9.addActionListener(aa);b0.addActionListener(aa);b11.addActionListener(op);b12.addActionListener(op);b13.addActionListener(op);b14.addActionListener(op);b16.addActionListener(re);b15.addActionListener(aa);bclar.addActionListener(cl);pan1.add(b1);pan1.add(b2);pan1.add(b3);pan1.add(b11);pan1.add(b4);pan1.add(b5);pan1.add(b6);pan1.add(b12);pan1.add(b7);pan1.add(b8);pan1.add(b9);pan1.add(b13);pan1.add(b0);pan1.add(b15);pan1.add(b16);pan1.add(b14);pan1.add(bclar);f.setSize(200,220);f.setVisible(true);}catch(Exception e){System.out.println(e.getMessage());}}class A implements ActionListener{public void actionPerformed(ActionEvent e){String a=text1.getText();String s=e.getActionCommand();if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/"))text1.setText(s);else {if(flag2){text1.setText(s);flag2=false;}elsetext1.setText(a+s);}}}class Opertion implements ActionListener{public void actionPerformed(ActionEvent e){cal=e.getActionCommand();if(flag1==true)source=text1.getText();text1.setText(cal);flag1=false;flag=true;}}class Result implements ActionListener{public void actionPerformed(ActionEvent e){double num1;num1=Double.parseDouble(source);object=text1.getText();double num2;num2=Double.parseDouble(object);double result=0;if(cal.equals("+"))result=num1+num2;if(cal.equals("-"))result=num1-num2;if(cal.equals("*"))result=num1*num2;if(cal.equals("/"))if(num2==0)text1.setText("除数不能为0");elseresult=num1/num2;String s1=Double.toString(result);text1.setText(s1);flag1=true;flag2=true;}}class Clar implements ActionListener{public void actionPerformed(ActionEvent e){text1.setText("0.");}}public static void main(String[] args){Counter count=new Counter();count.init();}public void windowClosing(WindowEvent e){System.exit(1);}public void windowOpened(WindowEvent e){}public void windowIconified(WindowEvent e){}public void windowDeiconified(WindowEvent e){}public void windowClosed(WindowEvent e){}public void windowActivated(WindowEvent e){}public void windowDeactivated(WindowEvent e){}}