2.工厂方法模式

最新推荐文章于 2025-12-17 22:24:42 发布

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#工厂方法模式

同样是《大话设计模式》的例子，简单计算器的例子。

运算类：

package 简单计算器;

public class Operating {
	
	private double firstNum;
	private double secondNum;
	private double result;
	public double getResult() {
		return result;
	}
	public void setResult(double result) {
		this.result = result;
	}
	public double getFirstNum() {
		return firstNum;
	}
	public void setFirstNum(double firstNum) {
		this.firstNum = firstNum;
	}
	public double getSecondNum() {
		return secondNum;
	}
	public void setSecondNum(double secondNum) {
		this.secondNum = secondNum;
	}
	

}

工厂类：

package 简单计算器;

public interface IOperatingFactory {
	
		public Operating CreateOperation();

}

加法运算类：

public class OperatingAdd extends Operating {

	public double getResult(){
		double result = 0;
		result = getFirstNum() + getSecondNum();
		return result;
	}
	
}

减法运算类：

package 简单计算器;

public class OperatingSub extends Operating {
	
	public double getResult(){
		double result = 0;
		result = getFirstNum() - getSecondNum();
		return result;
	}
}

乘法运算类：

package 简单计算器;

public class OperatingMul extends Operating {
	
	public double getResult(){
		double result = 0;
		result = getFirstNum() * getSecondNum();
		return result;
	}
}

除法运算类：

package 简单计算器;

public class OperatingDiv extends Operating{

	public double getResult(){
		double result = 0;
		try{
			result = getFirstNum() / getSecondNum();
		}catch(Exception e){
			System.out.println("除数不能为0！");
		}
		
		return result;
	}
	
}

加法工厂类：

package 简单计算器;

public class AddFactory implements IOperatingFactory {

	@Override
	public Operating CreateOperation() {
		// TODO Auto-generated method stub
		return new OperatingAdd();
	}

}

减法工厂类：

package 简单计算器;

public class SubFactory implements IOperatingFactory {

	@Override
	public Operating CreateOperation() {
		// TODO Auto-generated method stub
		return new OperatingSub();
	}

}

乘法工厂类：

package 简单计算器;

public class MulFactory implements IOperatingFactory {

	@Override
	public Operating CreateOperation() {
		// TODO Auto-generated method stub
		return new OperatingMul();
	}

}

除法工厂类：

package 简单计算器;

public class DivFactory implements IOperatingFactory {

	@Override
	public Operating CreateOperation() {
		// TODO Auto-generated method stub
		return new OperatingDiv();
	}

}

运行类：

package 简单计算器;

public class Run {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		IOperatingFactory operFactory = new AddFactory();
		Operating oper;
		oper = operFactory.CreateOperation();
		oper.setFirstNum(3);
		oper.setSecondNum(1);
		System.out.println(oper.getResult());
	}

}