简单工厂模式的UML类图与源码实现

最新推荐文章于 2025-06-22 16:13:03 发布

west8623

最新推荐文章于 2025-06-22 16:13:03 发布

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分类专栏： J2EE 文章标签： uml class exception div string

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本文介绍了一个简单的工厂模式案例，通过创建不同的操作类（加、减、乘、除），实现数学运算的功能。工厂类根据传入的操作符创建相应的操作对象。

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简单工厂模式的UML图

源码：Operation类

package com.felix;

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 com.felix;

public class Add extends Operation {

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

}

减类：

package com.felix;

public class Sub extends Operation {

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

}

乘类：

package com.felix;

public class Mul extends Operation {

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

}

除类：

package com.felix;

public class Div extends Operation {

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

}

工厂类:

package com.felix;

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：

package com.felix;

public class Client {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Operation operation = OperationFactory.createOperation('+');
		operation.setNumberA(10);
		operation.setNumberB(15);
		
		System.out.println(operation.operate());
	}

}