java项目模版一

import java.awt.BorderLayout; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; public class MyCalculater extends JFrame implements ActionListener private static final long serialVersionUID = 1L;/不管他 JPanel mainpanel = new JPanel(); /主面板 JPanel centerpanel = new JPanel(); /中心面板 JTextField txt = new JTextField(“); /主显示区 StringBuffer sb1 = new StringBuffer(); /参数一 StringBuffer sb2 = new StringBuffer(); /参数二 char sign; boolean flag = false; JButton buttons = new JButton16; buttons0 = new JButton(“1“); buttons1 = new JButton(“2“); buttons2 = new JButton(“3“); buttons3 = new JButton(“+“); buttons4 = new JButton(“4“); buttons5 = new JButton(“5“); buttons6 = new JButton(“6“); buttons7 = new JButton(“-“); buttons8 = new JButton(“7“); buttons9 = new JButton(“8“); buttons10 = new JButton(“9“); buttons11 = new JButton(“*“); buttons12 = new JButton(“0“); buttons13 = new JButton(“c“); buttons14 = new JButton(“=“); buttons15 = new JButton(“/“); centerpanel.setLayout(new GridLayout(4,4,8,8); for (int i = 0; i buttons.length; i+) centerpanel.add(buttonsi); buttonsi.addActionListener(this); public MyCalculater(int x,int y) this.setTitle(“我的计算器 “); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setContentPane(mainpanel); this.setResizable(false); BorderLayout bl = new BorderLayout(); mainpanel.setLayout(bl); mainpanel.add(txt,BorderLayout.NORTH); mainpanel.add(centerpanel,BorderLayout.CENTER); this.setBounds(x,y, 300, 240); this.setVisible(true); public static void main(String args) new MyCalculater(750, 200); Override public void actionPerformed(ActionEvent e) JButton jb = (JButton)e.getSource(); char c = jb.getText().charAt(0); switch(c) case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9: addNum(c); break; case +: case -: case *: case /: signEvent(c); break; case c: MyCalculater.this.dispose(); new MyCalculater(MyCalculater.this.getLocation().x,MyCalculater.this.getLocation().y); break; case =: if(!flag)this.txt.setText(sb1.toString(); sb1 = new StringBuffer(getAnswer(); sb2 = new StringBuffer(); this.txt.setText(sb1.toString(); sign = =; flag = false; break; default: break; private void signEvent(char c) if(flag this.txt.setText(sb1.toString(); else flag = !flag; this.txt.setText(“); this.sign = c; private String getAnswer() double a = 0; if(sb1.length()!=0) a = Double.parseDouble(sb1.toString(); double b = 0; if(sb2.length()!=0) b = Double.parseDouble(sb2.toString(); double answer = 0; switch(sign) case +: answer = a+b; this.txt.setText(“); break; case -: answer = a-b; this.txt.setText(“); break; case *: answer = a*b; this.txt.setText(“); break; case /: answer = a/b; this.txt.setText(“); break; default : return null; this.sb1 = new StringBuffer(“); this.sb2 = new StringBuffer(“); ret