1. import java.awt.*;
2. import java.awt.event.*;
3. import javax.swing.JOptionPane;
4. public class Puzzle extends Frame implements ActionListener{
5. Button b1,b2,b3,b4,b5,b6,b7,b8,b9;
6. Puzzle(){
7.     super(“Puzzle – JavaTpoint”);
8.     b1=new Button(“1”);
9.     b1.setBounds(50,100,40,40);
10.     b2=new Button(“2”);
11.     b2.setBounds(100,100,40,40);
12.     b3=new Button(“3”);
13.     b3.setBounds(150,100,40,40);
14.     b4=new Button(“4”);
15.     b4.setBounds(50,150,40,40);
16.     b5=new Button(“5”);
17.     b5.setBounds(100,150,40,40);
18.     b6=new Button(“6”);
19.     b6.setBounds(150,150,40,40);
20.     b7=new Button(“7”);
21.     b7.setBounds(50,200,40,40);
22.     b8=new Button(“”);
23.     b8.setBounds(100,200,40,40);
24.     b9=new Button(“8”);
25.     b9.setBounds(150,200,40,40);
27.     b1.addActionListener(this);
28.     b2.addActionListener(this);
29.     b3.addActionListener(this);
30.     b4.addActionListener(this);
31.     b5.addActionListener(this);
32.     b6.addActionListener(this);
33.     b7.addActionListener(this);
34.     b8.addActionListener(this);
35.     b9.addActionListener(this);
37.     add(b1);add(b2);add(b3);add(b4);add(b5);add(b6);add(b7);add(b8);add(b9);
38.     setSize(400,400);
39.     setLayout(null);
40.     setVisible(true);
41. }
42. public void actionPerformed(ActionEvent e){
43.     if(e.getSource()==b1){
44.         String label=b1.getLabel();
45.         if(b2.getLabel().equals(“”)){
46.             b2.setLabel(label);
47.             b1.setLabel(“”);
48.         }
49.         if(b4.getLabel().equals(“”)){
50.             b4.setLabel(label);
51.             b1.setLabel(“”);
52.         }
53.     }
54.     if(e.getSource()==b2){
55.         String label=b2.getLabel();
56.         if(b1.getLabel().equals(“”)){
57.             b1.setLabel(label);
58.             b2.setLabel(“”);
59.         }
60.         if(b3.getLabel().equals(“”)){
61.             b3.setLabel(label);
62.             b2.setLabel(“”);
63.         }
64.         if(b5.getLabel().equals(“”)){
65.             b5.setLabel(label);
66.             b2.setLabel(“”);
67.         }
68.     }
69.     if(e.getSource()==b3){
70.         String label=b3.getLabel();
71.         if(b2.getLabel().equals(“”)){
72.             b2.setLabel(label);
73.             b3.setLabel(“”);
74.         }
75.         if(b6.getLabel().equals(“”)){
76.             b6.setLabel(label);
77.             b3.setLabel(“”);
78.         }
79.     }
80.     if(e.getSource()==b4){
81.         String label=b4.getLabel();
82.         if(b1.getLabel().equals(“”)){
83.             b1.setLabel(label);
84.             b4.setLabel(“”);
85.         }
86.         if(b7.getLabel().equals(“”)){
87.             b7.setLabel(label);
88.             b4.setLabel(“”);
89.         }
90.         if(b5.getLabel().equals(“”)){
91.             b5.setLabel(label);
92.             b4.setLabel(“”);
93.         }
94.     }
95.     if(e.getSource()==b5){
96.         String label=b5.getLabel();
97.         if(b2.getLabel().equals(“”)){
98.             b2.setLabel(label);
99.             b5.setLabel(“”);
100.         }
101.         if(b6.getLabel().equals(“”)){
102.             b6.setLabel(label);
103.             b5.setLabel(“”);
104.         }
105.         if(b4.getLabel().equals(“”)){
106.             b4.setLabel(label);
107.             b5.setLabel(“”);
108.         }
109.         if(b8.getLabel().equals(“”)){
110.             b8.setLabel(label);
111.             b5.setLabel(“”);
112.         }
113.     }
114.     if(e.getSource()==b6){
115.         String label=b6.getLabel();
116.         if(b9.getLabel().equals(“”)){
117.             b9.setLabel(label);
118.             b6.setLabel(“”);
119.         }
120.         if(b3.getLabel().equals(“”)){
121.             b3.setLabel(label);
122.             b6.setLabel(“”);
123.         }
124.         if(b5.getLabel().equals(“”)){
125.             b5.setLabel(label);
126.             b6.setLabel(“”);
127.         }
128.     }
129.     if(e.getSource()==b7){
130.         String label=b7.getLabel();
131.         if(b4.getLabel().equals(“”)){
132.             b4.setLabel(label);
133.             b7.setLabel(“”);
134.         }
135.         if(b8.getLabel().equals(“”)){
136.             b8.setLabel(label);
137.             b7.setLabel(“”);
138.         }
139.     }
140.     if(e.getSource()==b8){
141.         String label=b8.getLabel();
142.         if(b9.getLabel().equals(“”)){
143.             b9.setLabel(label);
144.             b8.setLabel(“”);
145.         }
146.         if(b7.getLabel().equals(“”)){
147.             b7.setLabel(label);
148.             b8.setLabel(“”);
149.         }
150.         if(b5.getLabel().equals(“”)){
151.             b5.setLabel(label);
152.             b8.setLabel(“”);
153.         }
154.     }
155.     if(e.getSource()==b9){
156.         String label=b9.getLabel();
157.         if(b6.getLabel().equals(“”)){
158.             b6.setLabel(label);
159.             b9.setLabel(“”);
160.         }
161.         if(b8.getLabel().equals(“”)){
162.             b8.setLabel(label);
163.             b9.setLabel(“”);
164.         }
165.     }
167.     //congrats code
168.     if(b1.getLabel().equals(“1”)&&b2.getLabel().equals(“2”)&&b3.getLabel()
169.             .equals(“3”)&&b4.getLabel().equals(“4”)&&b5.getLabel().equals(“5”)
170.             &&b6.getLabel().equals(“6”)&&b7.getLabel().equals(“7”)&&b8.getLabel()
171.             .equals(“8”)&&b9.getLabel().equals(“”)){
172.             JOptionPane.showMessageDialog(this,“Congratulations! You won.”);
173.     }
174. }
175. public static void main(String[] args) {
176.     new Puzzle();
177. }

}