简单工厂模式的UML类图与源码实现

 

简单工厂模式的UML图

 

源码：Operation类

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：

package Operation;

public class Add extends Operation {

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

 减类：

package Operation;

public class Sub extends Operation {

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

 乘类：

package Operation;

public class Mul extends Operation {

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

 除类：

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:

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：

import Operation.Operation;
public class Client {

	public static void main(String[] args) {
		Operation operation = OperationFactory.createOperation('*');
		operation.setNumberA(12);
		operation.setNumberB(6);
		System.out.println(operation.operate());
	}
}