1、
public interface Utility { private int Max_SIZE = 20; int MIN_SIZE=10; void use(){ System.out.println(\); } private int getSize(); }
1、
Illegal modifier for the interface field Utility.Max_SIZE; only public, static & final are permitted
Illegal modifier for the interface method getSize; only public & abstract are permitted Abstract methods do not specify a body
2、 3、
三个错误的简记
2、
package cn.bdqn.execise; public interface Utility { }
package cn.bdqn.execise;
class FourWheeler implements Utility{} class Car extends FourWheeler{} class Bus extends FourWheeler{}
public class Test { public static void main(String[] args) { Utility car=new Car(); FourWheeler bus=new Bus(); Utility ut =new Utility(); Bus bus=new FourWheeler(); } }
黄色部分是显然错误的。 绿色部分是正确的。 但绿色的第一句很独特。