利用接口做参数，写个计算器，能完成+-*/运算 （1）定义一个接口Compute含有一个方法int computer(int n,int m); （2）设计四个类分别实现此接口，完成+-*/运算 （3）设计一个类UseCompute，含有方法： public void useCom(Compute com, int one, int two) 此方法要求能够：1．用传递过来的对象调用compute

package com.homework5;

public interface Compute {

    //声明抽象方法
    int computer(int n,int m);

}

package com.homework5;

public class jia implements Compute {

    @Override
    public int computer(int n, int m) {

        return n+m;
    }

}

package com.homework5;

public class jian implements Compute {

    @Override
    public int computer(int n, int m) {

        return n-m;
    }

}

package com.homework5;

public class cheng implements Compute {

    @Override
    public int computer(int n, int m) {

        return n*m;
    }

}

package com.homework5;

public class chu implements Compute {

    @Override
    public int computer(int n, int m) {

        return n/m;
    }

}

package com.homework5;

public class UseCompute {

    public void useCom(Compute com, int one, int two)
    {
        System.out.println(com.computer(one, two));
    }

}

package com.homework5;

public class E {

    public static void main(String[] args) {

        UseCompute uc= new  UseCompute();
        uc.useCom(new jia(), 5, 8);
        uc.useCom(new jian(), 2, 8);
        uc.useCom(new cheng(), 5, 8);
        uc.useCom(new chu(), 40, 8);

    }

}