设计模式Bridge模式

Posted 2020-10-29 BigJunOBa

　　Bridge模式就是将类的功能层次结构和类的实现层次结构连接起来。

　　

 1 package bigjunoba.bjtu.function;
 2 
 3 import bigjunoba.bjtu.implement.DisplatImpl;
 4 
 5 public class Display {
 6     
 7     private DisplatImpl impl;
 8 
 9     public Display(DisplatImpl impl) {
10         this.impl = impl;
11     }
12     
13     public void open() {
14         impl.rawOpen();
15     }
16     
17     public void pring() {
18         impl.rawPrint();
19     }
20     
21     public void close() {
22         impl.rawClose();
23     }
24     
25     public final void display() {
26         open();
27         pring();
28         close();
29     }
30 }

　　Display类。

 1 package bigjunoba.bjtu.function;
 2 
 3 import bigjunoba.bjtu.implement.DisplatImpl;
 4 
 5 public class CountDisplay extends Display{
 6 
 7     public CountDisplay(DisplatImpl impl) {
 8         super(impl);
 9     }
10     
11     public void multiDisplay(int times) {
12         open();
13         for (int i = 0; i < times; i++) {
14             pring();
15         }
16         close();
17     }
18     
19 }

　　CountDisplay类。

1 package bigjunoba.bjtu.implement;
2 
3 public abstract class DisplatImpl {
4     
5     public abstract void rawOpen();
6     public abstract void rawPrint();
7     public abstract void rawClose();
8     
9 }

　　

 1 package bigjunoba.bjtu.implement;
 2 
 3 public class StringDisplayImpl extends DisplatImpl{
 4     
 5     private String string;
 6     private int width;
 7     public StringDisplayImpl(String string) {
 8         this.string = string;
 9         this.width = string.getBytes().length;
10     }
11 
12     @Override
13     public void rawOpen() {
14         printLine();
15     }
16 
17     @Override
18     public void rawPrint() {
19         System.out.println("|" + string + "|");
20     }
21 
22     @Override
23     public void rawClose() {
24         printLine();
25     }
26     
27     private void printLine() {
28         System.out.print("+");
29         for (int i = 0; i < width; i++) {
30             System.out.print("-");
31         }
32         System.out.println("+");
33     }
34 
35 }

　　StringDisplayImpl类。

 1 package bigjunoba.bjtu.test;
 2 
 3 import bigjunoba.bjtu.function.CountDisplay;
 4 import bigjunoba.bjtu.function.Display;
 5 import bigjunoba.bjtu.implement.StringDisplayImpl;
 6 
 7 public class Main {
 8     
 9     public static void main(String[] args) {
10         Display display1 = new Display(new StringDisplayImpl("Lianjiang"));
11         Display display2 = new CountDisplay(new StringDisplayImpl("Lianjiangjiang"));
12         CountDisplay countDisplay = new CountDisplay(new StringDisplayImpl("Lianjiangjiangjiang"));
13         display1.display();
14         display2.display();
15         countDisplay.display();
16         countDisplay.multiDisplay(5);
17     }
18 }

　　Main类。

+---------+
|Lianjiang|
+---------+
+--------------+
|Lianjiangjiang|
+--------------+
+-------------------+
|Lianjiangjiangjiang|
+-------------------+
+-------------------+
|Lianjiangjiangjiang|
|Lianjiangjiangjiang|
|Lianjiangjiangjiang|
|Lianjiangjiangjiang|
|Lianjiangjiangjiang|
+-------------------+

 　　输出结果是这样的。