java 计算器小程序

package s;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Font;
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 Jsq extends JFrame {
JTextField tf=new JTextField("0.");
JButton b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;
JButton b10,b11,b12,b13;
JButton b14=new JButton(".");
JButton b15=new JButton("=");
JButton b16=new JButton("clear");
JPanel p=new JPanel();
String snum;
String yunSuan;
public Jsq(){
tf.setHorizontalAlignment(JTextField.RIGHT);
b0=new JButton("0");b1=new JButton("1");
b2=new JButton("2");b3=new JButton("3");
b4=new JButton("4");b5=new JButton("5");
b6=new JButton("6");b7=new JButton("7");
b8=new JButton("8");b9=new JButton("9");
b10=new JButton("+");b11=new JButton("-");
b12=new JButton("*");b13=new JButton("/");
C c=new C();
b10.addActionListener(c);
b11.addActionListener(c);
b12.addActionListener(c);
b13.addActionListener(c);
b15.addActionListener(new D());
p.setLayout(new GridLayout(4,4,4,4));
A a=new A();
b0.addActionListener(a);b1.addActionListener(a);
b2.addActionListener(a);b3.addActionListener(a);
b4.addActionListener(a);b5.addActionListener(a);
b6.addActionListener(a);b7.addActionListener(a);
b8.addActionListener(a);b9.addActionListener(a);
b14.addActionListener(a);
p.add(b1);p.add(b2);p.add(b3);p.add(b10);
p.add(b4);p.add(b5);p.add(b6);p.add(b11);
p.add(b7);p.add(b8);p.add(b9);p.add(b12);
p.add(b0);p.add(b14);p.add(b15);p.add(b13);
b16.addActionListener(new B());
this.add(tf,BorderLayout.NORTH);
this.add(p,BorderLayout.CENTER);
this.add(b16,BorderLayout.SOUTH);
this.setBounds(40,40,320,300);
this.setResizable(false);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new Jsq();
}
class A implements ActionListener{
public void actionPerformed(ActionEvent e) {
String s=e.getActionCommand();
String ss=tf.getText();
if(ss.equals("0.")||ss.equals("+")||ss.equals("-")||ss.equals("*")||ss.equals("/")||ss.equals(".")){
tf.setText(s);
}else   tf.setText(tf.getText()+s);
}
}
class B implements ActionListener{
public void actionPerformed(ActionEvent arg0) {
tf.setText("0.");
}
}
class C implements ActionListener{
public void actionPerformed(ActionEvent e) {
snum=tf.getText();
yunSuan=e.getActionCommand();
tf.setText(yunSuan);
}
}
class D implements ActionListener{
public void actionPerformed(ActionEvent e) {
double num1=Double.parseDouble(snum);
double num2=Double.parseDouble(tf.getText());
String s=Double.toString(num1+num2);
if(yunSuan.equals("+")) tf.setText(s);
if(yunSuan.equals("-")) tf.setText(Double.toString(num1-num2));
if(yunSuan.equals("*")) tf.setText(Double.toString(num1*num2));
if(yunSuan.equals("/")) tf.setText(Double.toString(num1/num2));
}
}
}