JAVA与模式(一)-----简单工厂模式
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package com.migo2008.factory;
public interface Computer ...{
//显示器
void display();
//主机
void hostComputer();
//键盘
void keyboard();
//鼠标
void mouse();
//打印信息
void output(String msg);
}
package com.migo2008.factory;
public class IBM implements Computer ...{
/** *//**
* 实现接口
*/
public void display() ...{
output("Display Of IBM");
}
public void hostComputer() ...{
output("HostComputer Of IBM");
}
public void keyboard() ...{
output("Keyboard Of IBM");
}
public void mouse() ...{
output("Mouse Of IBM");
}
public void output(String msg)...{
System.out.println(msg);
}
}
package com.migo2008.factory;
public class ASUS implements Computer ...{
public void display() ...{
output("Display Of ASUS");
}
public void hostComputer() ...{
output("HostComputer Of ASUS");
}
public void keyboard() ...{
output("Keyboard Of ASUS");
}
public void mouse() ...{
output("Mouse Of ASUS");
}
public void output(String msg)...{
System.out.println(msg);
}
}
package com.migo2008.factory;
public class Factory ...{
public static Computer getComputer(String com)...{
if(com.equalsIgnoreCase("IBM"))
return new IBM();
else if(com.equalsIgnoreCase("ASUS"))
return new ASUS();
else
return null;
}
}
package com.migo2008.factory;
public class User ...{
public static void main(String[] args)...{
//通过工厂访问IBM.display()
Factory.getComputer("IBM").display();
Factory.getComputer("IBM").keyboard();
Factory.getComputer("IBM").hostComputer();
Factory.getComputer("IBM").mouse();
//通过工厂访问ASUS.keyboard()
Factory.getComputer("ASUS").display();
Factory.getComputer("ASUS").keyboard();
Factory.getComputer("ASUS").hostComputer();
Factory.getComputer("ASUS").mouse();
}
}输出结果:
Display Of IBM
Keyboard Of IBM
HostComputer Of IBM
Mouse Of IBM
Display Of ASUS
Keyboard Of ASUS
HostComputer Of ASUS
Mouse Of ASUS
简单工厂模式 举例:
Computer接口:
package com.migo2008.factory;public interface Computer ...{ //显示器 void display(); //主机 void hostComputer(); //键盘 void keyboard(); //鼠标 void mouse(); //打印信息 void output(String msg);}IBM实现Computer
package com.migo2008.factory;public class IBM implements Computer ...{ /** *//** * 实现接口 */ public void display() ...{ output("Display Of IBM"); } public void hostComputer() ...{ output("HostComputer Of IBM"); } public void keyboard() ...{ output("Keyboard Of IBM"); } public void mouse() ...{ output("Mouse Of IBM"); } public void output(String msg)...{ System.out.println(msg); }}ASUS实现Computer
package com.migo2008.factory;public class ASUS implements Computer ...{ public void display() ...{ output("Display Of ASUS"); } public void hostComputer() ...{ output("HostComputer Of ASUS"); } public void keyboard() ...{ output("Keyboard Of ASUS"); } public void mouse() ...{ output("Mouse Of ASUS"); } public void output(String msg)...{ System.out.println(msg); }}Factory类（简单工厂模式的体现）
package com.migo2008.factory;public class Factory ...{ public static Computer getComputer(String com)...{ if(com.equalsIgnoreCase("IBM")) return new IBM(); else if(com.equalsIgnoreCase("ASUS")) return new ASUS(); else return null; }}User 类使用工厂
package com.migo2008.factory;public class User ...{ public static void main(String[] args)...{ //通过工厂访问IBM.display() Factory.getComputer("IBM").display(); Factory.getComputer("IBM").keyboard(); Factory.getComputer("IBM").hostComputer(); Factory.getComputer("IBM").mouse(); //通过工厂访问ASUS.keyboard() Factory.getComputer("ASUS").display(); Factory.getComputer("ASUS").keyboard(); Factory.getComputer("ASUS").hostComputer(); Factory.getComputer("ASUS").mouse(); }}输出结果:Display Of IBMKeyboard Of IBMHostComputer Of IBMMouse Of IBMDisplay Of ASUSKeyboard Of ASUSHostComputer Of ASUSMouse Of ASUS上面分别展示了简单工厂模式中的三种不同角色：
抽象产品角色，工厂角色与具体产品角色
抽象产品角色可以为接口或抽象类.抽象产品角色 可与 工厂角色合并；抽象产品角色，工厂角色与具体产品角色也可合并.
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