学步园

简单工厂模式的UML图

源码：Operation类

Java代码

1. package Operation;   
2.   
3. public abstract class Operation {   
4.     double numberA=0;   
5.     double numberB=0;   
6.        
7.     public double getNumberA() {   
8.         return numberA;   
9.     }   
10.   
11.     public void setNumberA(double numberA) {   
12.         this.numberA = numberA;   
13.     }   
14.   
15.     public double getNumberB() {   
16.         return numberB;   
17.     }   
18.   
19.     public void setNumberB(double numberB) {   
20.         this.numberB = numberB;   
21.     }   
22.   
23.     public abstract double operate();   
24. }  

package Operation;

public abstract class Operation {
	double numberA=0;
	double numberB=0;
	
	public double getNumberA() {
		return numberA;
	}

	public void setNumberA(double numberA) {
		this.numberA = numberA;
	}

	public double getNumberB() {
		return numberB;
	}

	public void setNumberB(double numberB) {
		this.numberB = numberB;
	}

	public abstract double operate();
}

 加类：

Java代码

1. package Operation;   
2.   
3. public class Add extends Operation {   
4.   
5.     @Override  
6.     public double operate() {   
7.         return numberA+numberB;   
8.     }   
9. }  

package Operation;

public class Add extends Operation {

	@Override
	public double operate() {
		return numberA+numberB;
	}
}

 减类：

Java代码

1. package Operation;   
2.   
3. public class Sub extends Operation {   
4.   
5.     @Override  
6.     public double operate() {   
7.         return numberA-numberB;   
8.     }   
9. }  

package Operation;

public class Sub extends Operation {

	@Override
	public double operate() {
		return numberA-numberB;
	}
}

 乘类：

Java代码

1. package Operation;   
2.   
3. public class Mul extends Operation {   
4.   
5.     @Override  
6.     public double operate() {   
7.         return numberA*numberB;   
8.     }   
9. }  

package Operation;

public class Mul extends Operation {

	@Override
	public double operate() {
		return numberA*numberB;
	}
}

 除类：

Java代码

1. package Operation;   
2.   
3. import java.io.IOError;   
4.   
5. public class Div extends Operation {   
6.   
7.     @Override  
8.     public double operate() {   
9.         try {   
10.             return numberA/numberB;   
11.         } catch (IOError e) {   
12.             System.out.println("除数不能为空！");   
13.             return 0;   
14.         }   
15.     }   
16. }  

package Operation;

import java.io.IOError;

public class Div extends Operation {

	@Override
	public double operate() {
		try {
			return numberA/numberB;
		} catch (IOError e) {
			System.out.println("除数不能为空！");
			return 0;
		}
	}
}

工厂类:

Java代码

1. import Operation.Add;   
2. import Operation.Div;   
3. import Operation.Mul;   
4. import Operation.Operation;   
5. import Operation.Sub;   
6.   
7. public class OperationFactory {   
8.     public static Operation createOperation(char operate){   
9.         Operation operation=null;   
10.         switch (operate) {   
11.         case '+':   
12.             operation=new Add();   
13.             break;   
14.         case '-':   
15.             operation=new Sub();   
16.             break;   
17.         case '*':   
18.             operation=new Mul();   
19.             break;     
20.         case '/':   
21.             operation=new Div();   
22.             break;   
23.         }   
24.         return operation;   
25.     }   
26. }  

import Operation.Add;
import Operation.Div;
import Operation.Mul;
import Operation.Operation;
import Operation.Sub;

public class OperationFactory {
	public static Operation createOperation(char operate){
		Operation operation=null;
		switch (operate) {
		case '+':
			operation=new Add();
			break;
		case '-':
			operation=new Sub();
			break;
		case '*':
			operation=new Mul();
			break;	
		case '/':
			operation=new Div();
			break;
		}
		return operation;
	}
}

 客户端：

Java代码

转自：http://hlzhou.javaeye.com/blog/551492