Java接口简单理解

1 public interface Interface_class {
2     int a=10;
3 //    public static final int a=10;//等同于上面常量的声明，接口成员变量(常量)默认为public、static、final
4     int b=20;
5     int compareTo();
6 //    public abstract int compareTo();等同于上面方法的声明，接口成员方法默认为public、abstract
7 }

 1 public class Main implements Interface_class{
 2     @Override
 3     public int compareTo() {
 4         int x= Interface_class.a;
 5         int y = Interface_class.b;
 6         return((x>y)?x:y);
 7     }
 8     public static void main(String[] args) {
 9     // write your code here
10         Main main=new Main();
11         System.out.println(main.compareTo());
12         main.compareTo();
13     }
14 }