java实现简单的加法器

1.匿名类实现接口的加法器

2.内部类实现接口的加法器

3.本类实现接口

1.匿名类实现接口的加法器

 1 package inclass;
 2 
 3 import java.awt.FlowLayout;
 4 import java.awt.event.ActionEvent;
 5 import java.awt.event.ActionListener;
 6 //匿名类类实现接口
 7 import javax.swing.*;
 8 
 9 class Add1 extends JFrame implements ActionListener{
10     JButton jButton = new JButton("=");
11     JLabel jLabel = new JLabel("+");
12     JTextField j1 = new JTextField(4);
13     JTextField j2 = new JTextField(4);
14     JTextField j3 = new JTextField(4);
15     
16     public Add1() {
17         setSize(300,100);
18         setVisible(true);
19         setDefaultCloseOperation(EXIT_ON_CLOSE);
20         setLayout(new FlowLayout());
21         add(j1);
22         add(jLabel);
23         add(j2);
24         add(jButton);
25         add(j3);
26         validate();
27         jButton.addActionListener(this);
28     }
29     public void actionPerformed(ActionEvent event)
30     {
31         try {
32             double t1 = Double.parseDouble(j1.getText());
33             double t2 = Double.parseDouble(j2.getText());
34             j3.setText(Double.toString(t1+t2));
35         }
36         catch (NumberFormatException e) {
37             JOptionPane.showMessageDialog(null, e);
38         }
39     }
40 }
41 
42 public class Error{
43     public static void main(String[] args) {
44         new Add1();
45     }
46 }

2.内部类实现接口的加法器

 1 package inclass;
 2 import java.awt.FlowLayout;
 3 import java.awt.event.ActionEvent;
 4 import java.awt.event.ActionListener;
 5 //内部类实现接口
 6 import javax.swing.*;
 7 
 8 class Add extends JFrame{
 9     JButton jButton = new JButton("=");
10     JLabel jLabel = new JLabel("+");
11     JTextField j1 = new JTextField(4);
12     JTextField j2 = new JTextField(4);
13     JTextField j3 = new JTextField(4);
14     
15     public Add() {
16         setSize(300,100);
17         setVisible(true);
18         setDefaultCloseOperation(EXIT_ON_CLOSE);
19         setLayout(new FlowLayout());
20         add(j1);
21         add(jLabel);
22         add(j2);
23         add(jButton);
24         add(j3);
25         validate();
26         jButton.addActionListener(new Tt());
27     }
28     class Tt implements ActionListener{
29         public void actionPerformed(ActionEvent event)
30         {
31             try {
32                 double t1 = Double.parseDouble(j1.getText());
33                 double t2 = Double.parseDouble(j2.getText());
34                 j3.setText(Double.toString(t1+t2));
35             }
36             catch (NumberFormatException e) {
37                 JOptionPane.showMessageDialog(null, e);
38             }
39         }
40     }
41 }
42 
43 
44 
45 public class Text1 {
46     public static void main(String[] args) {
47         new Add();
48     }
49 
50 }

3.本类实现接口

 1 package inclass;
 2 import java.awt.FlowLayout;
 3 import java.awt.event.ActionEvent;
 4 import java.awt.event.ActionListener;
 5 //内部类实现接口
 6 import javax.swing.*;
 7 
 8 class Add extends JFrame{
 9     JButton jButton = new JButton("=");
10     JLabel jLabel = new JLabel("+");
11     JTextField j1 = new JTextField(4);
12     JTextField j2 = new JTextField(4);
13     JTextField j3 = new JTextField(4);
14     
15     public Add() {
16         setSize(300,100);
17         setVisible(true);
18         setDefaultCloseOperation(EXIT_ON_CLOSE);
19         setLayout(new FlowLayout());
20         add(j1);
21         add(jLabel);
22         add(j2);
23         add(jButton);
24         add(j3);
25         validate();
26         jButton.addActionListener(new Tt());
27     }
28     class Tt implements ActionListener{
29         public void actionPerformed(ActionEvent event)
30         {
31             try {
32                 double t1 = Double.parseDouble(j1.getText());
33                 double t2 = Double.parseDouble(j2.getText());
34                 j3.setText(Double.toString(t1+t2));
35             }
36             catch (NumberFormatException e) {
37                 JOptionPane.showMessageDialog(null, e);
38             }
39         }
40     }
41 }
42 public class Text1 {
43     public static void main(String[] args) {
44         new Add();
45     }
46 
47 }

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原文地址：https://www.cnblogs.com/nanfengnan/p/12746143.html