Java定义接口编程 接口有两个方法

Question

 

Answer 1

public class TestDemo{
    public static void main(String[] args) {
        A a = new B();
        System.out.println(a.method1(2, 3));
        System.out.println(a.method2(2, 3));
    }


}
interface A{
    int method1(int x, int y);

    int method2(int x, int y);
}
class B implements A{
    @Override
    public int method1(int x, int y) {
        int sum =  x;
        for (int a = 1; a < y; a++){
            sum = sum * x;
        }
        return sum;
    }

    @Override
    public int method2(int x, int y) {
        return x > y ? x : y;
    }
}