设计模式模式（四）：建造者模式（生成器模式）
建造者模式主要解决问题：
具备若干成员，当其中一个成员发生变化，其它成员也随着发生变化。
这种复杂对象的生成需要使用建造者模式来生成。
建造者设计模式的结构图：
来源：http://c.biancheng.net/view/1354.html
例子：
街头篮球角色创建模拟
街头篮球： 中锋、前锋、后卫
最重要的属性：身高（会影响其他属性）
中锋：身高加1 速度减1 盖帽加2
前锋：身高加2 速度减1 盖帽加1
后卫：身高加3 速度减1 盖帽加1
代码如下：
代码结构图;
具体代码;
父类;AbstractPlayer：
1 package org.yys.建造者设计模式.interfaces.impl;
2
3 public class AbstractPlayer {
4 /**
5 * 身高: height
6 * 速度: speedvalue
7 * 盖帽: blockvalue
8 */
9
10 protected int height;
11 protected int speedvalue;
12 protected int blockvalue;
13 public int getHeight() {
14 return height;
15 }
16 public void setHeight(int height) {
17 this.height = height;
18 }
19 public int getSpeedvalue() {
20 return speedvalue;
21 }
22 public void setSpeedvalue(int speedvalue) {
23 this.speedvalue = speedvalue;
24 }
25 public int getBlockvalue() {
26 return blockvalue;
27 }
28 public void setBlockvalue(int blockvalue) {
29 this.blockvalue = blockvalue;
30 }
31 @Override
32 public String toString() {
33 return "Player [height=" + height + ", speedvalue=" + speedvalue + ", blockvalue=" + blockvalue + "]";
34 }
35
36
37
38 }
CPlayer:前锋entity：
1 package org.yys.建造者设计模式.entity;
2
3 import org.yys.建造者设计模式.interfaces.impl.AbstractPlayer;
4 public class CPlayer extends AbstractPlayer{
5
6 public CPlayer() {
7 super();
8 this.height=190;
9 this.speedvalue=25;
10 this.blockvalue=75 ;
11 }
12
13 @Override
14 public String toString() {
15 return "CPlayer [toString()=" + super.toString() + "]";
16 }
17
18
19 }
FPlayer:中锋entity：
1 package org.yys.建造者设计模式.entity;
2 import org.yys.建造者设计模式.interfaces.impl.AbstractPlayer;
3
4 public class FPlayer extends AbstractPlayer{
5
6 @Override
7 public String toString() {
8 return "FPlayer [toString()=" + super.toString() + "]";
9 }
10
11 public FPlayer() {
12 super();
13 this.height=180 ;
14 this.blockvalue=50 ;
15 this.speedvalue=50 ;
16 }
17 }
GPlayer：后卫entity:
1 package org.yys.建造者设计模式.entity;
2
3 import org.yys.建造者设计模式.interfaces.impl.AbstractPlayer;
4
5 public class GPlayer extends AbstractPlayer {
6
7 public GPlayer() {
8 super();
9 this.height = 170 ;
10 this.blockvalue = 30 ;
11 this.speedvalue =75 ;
12 }
13
14 @Override
15 public String toString() {
16 return "GPlayer [toString()=" + super.toString() + "]";
17 }
18
19
20
21 }
Builder接口（改变数值的具体方法接口）
1 package org.yys.建造者设计模式.interfaces;
2
3 import org.yys.建造者设计模式.interfaces.impl.AbstractPlayer;
4
5 public interface Builder {
6
7 void changeHeight(int count);
8 void changeBlockValue(int count);
9 void changeSpeedValue(int count);
10
11 AbstractPlayer getPlayer();
12 }
CPlayerBuilderImpl：
1 package org.yys.建造者设计模式.interfaces.impl;
2
3 import org.yys.建造者设计模式.entity.CPlayer;
4 import org.yys.建造者设计模式.interfaces.Builder;
5
6 public class CPlayerBuilderImpl implements Builder {
7
8 private CPlayer player = new CPlayer();
9 @Override
10 public void changeHeight(int count) {
11
12 this.player.height +=count ;
13 }
14
15 @Override
16 public void changeBlockValue(int count) {
17 // TODO Auto-generated method stub
18 this.player.blockvalue +=count*2;
19 }
20
21 @Override
22 public void changeSpeedValue(int count) {
23 // TODO Auto-generated method stub
24 this.player.speedvalue -=count ;
25 }
26
27 @Override
28 public AbstractPlayer getPlayer() {
29 // TODO Auto-generated method stub
30 return this.player;
31 }
32
33 }
FPlayerBuilderImpl：
1 package org.yys.建造者设计模式.interfaces.impl;
2
3 import org.yys.建造者设计模式.entity.FPlayer;
4 import org.yys.建造者设计模式.interfaces.Builder;
5
6 public class FPlayerBuilderImpl implements Builder {
7 private FPlayer player = new FPlayer();
8 @Override
9 public void changeHeight(int count) {
10 // TODO Auto-generated method stub
11 this.player.height += count ;
12 }
13
14 @Override
15 public void changeBlockValue(int count) {
16 // TODO Auto-generated method stub
17 this.player.blockvalue +=count/2 ;
18 }
19
20 @Override
21 public void changeSpeedValue(int count) {
22 // TODO Auto-generated method stub
23 this.player.speedvalue -=count/2 ;
24 }
25
26 @Override
27 public AbstractPlayer getPlayer() {
28 // TODO Auto-generated method stub
29 return this.player;
30 }
31
32 }
GPlayerBuilderImpl：
1 package org.yys.建造者设计模式.interfaces.impl;
2
3 import org.yys.建造者设计模式.entity.GPlayer;
4 import org.yys.建造者设计模式.interfaces.Builder;
5
6 public class GPlayerBuilderImpl implements Builder {
7 private GPlayer player = new GPlayer();
8
9 @Override
10 public void changeHeight(int count) {
11 // TODO Auto-generated method stub
12 this.player.height += count;
13 }
14
15 @Override
16 public void changeBlockValue(int count) {
17 // TODO Auto-generated method stub
18 this.player.blockvalue += count / 3;
19 }
20
21 @Override
22 public void changeSpeedValue(int count) {
23 // TODO Auto-generated method stub
24 this.player.speedvalue -= count / 3;
25 }
26
27 @Override
28 public AbstractPlayer getPlayer() {
29 // TODO Auto-generated method stub
30 return this.player;
31 }
32
33 }
Redirector（总指挥）
1 package org.yys.建造者设计模式.interfaces;
2
3 import org.yys.建造者设计模式.interfaces.impl.AbstractPlayer;
4
5 public class Redirector {
6
7 private Builder builder;
8
9 public Redirector(Builder builder) {
10 super();
11 this.builder = builder;
12 }
13
14 public AbstractPlayer changeCount(int count) {
15
16 builder.changeHeight(count);
17 builder.changeSpeedValue(count);
18 builder.changeBlockValue(count);
19
20 return builder.getPlayer();
21
22 }
23
24 }
测试：
1 package org.yys.建造者设计模式.Demo;
2
3 import org.yys.建造者设计模式.interfaces.Redirector;
4 import org.yys.建造者设计模式.interfaces.impl.AbstractPlayer;
5 import org.yys.建造者设计模式.interfaces.impl.CPlayerBuilderImpl;
6
7 public class TestDemo {
8 public static void main(String[] args) {
9
10 Redirector redirector = new Redirector(new CPlayerBuilderImpl());
11
12 AbstractPlayer player =redirector.changeCount(10);
13
14 System.out.println(player);
15
16
17 }
18 }
结果：
学识浅薄，如有不对，恳请指教。
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