/**
 * 面向对象（运算类）
 * 简易计算器
 * @author Monica
 *
 */
public class Operation {
    private double numberA = 0;
    private double numberB = 0;
    
    //虚函数
    public double GetResult() {
        double result = 0;
        return result;
    }

    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;
    }
}

 

/**
 * 加法
 * @author Monica
 *
 */
public class OperationAdd extends Operation {
    
    /**
     * 继承运算类
     */
    @Override
    public double GetResult() {
        double result = 0;
        result = getNumberA() + getNumberB();
        return super.GetResult();
    }
}

 

/**
 * 简单工厂模式
 * @author Administrator
 *
 */
public class OperationFactory {

    public static Operation createOperate(char operate) {
        Operation oper = null;
        switch (operate) {
        case '+':
            oper = new OperationAdd();
            break;
        }
        return oper;
    }
}

 

public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Operation oper; 
        oper = OperationFactory.createOperate('+');
        oper.setNumberA(1);
        oper.setNumberB(2);
        double result = oper.GetResult();
    }

}