Java接口四个类四则运算_用JAVA设计一个接口，声明有关算术运行的方法，并创建四个应用该接口的类，分别进行+-*/四则运算...

满意答案

接口：

public interface Operator {

public double operation(double a, double b);

}

加法：

public class Plus implements Operator {

public double operation(double a, double b) {

return a+b;

}

}

减法：

public class Minus implements Operator {

public double operation(double a, double b) {

return a-b;

}

}

乘法：

public class Times implements Operator {

public double operation(double a, double b) {

return a*b;

}

}

除法：

public class Divide implements Operator {

public double operation(double a, double b) {

return a/b;

}

}

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