Java接口、lambda的学习

1 interface Printable{
2     final int MAX = 100;
3     void add();
4     float sum(float x, float y);
5 }

1 interface Printable{
2     public final static int MAX= 100;
3     public abstract void add();
4     public abstract float sum(float x,float y);
5 }

 1 public interface Computable{    //声明接口Computable
 2     int MAX = 46;
 3     int f(int x);
 4 }
 5 
 6 public class China implements Computable{    //China类实现接口
 7     int number;
 8     public int f(int x){    //重写接口f方法  public的注意
 9         int sum = 0;
10         
11         for(int i = 1; i <= x; i++){
12             sum = sum + i;
13         }
14 
15         return sum;
16      }
17 }
18 
19 public class CalMax implements Computable{    
20     int number;
21     public int f(int x){
22         return MAX + x;
23     }
24 }