java源代码精华版

import java.awt.*; import javax.swing.*; import java.awt.event.*; class Counter2 extends WindowAdapter { static JFrame f=new JFrame("?????‾"); 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("??芍?"); 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; } else text1.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("3y那y2??邦?a0"); else result=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) { Counter2 count=new Counter2(); 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){} }