Comparable: 一个类实现了Camparable接口则表明这个类的对象之间是可以相互比较的，这个类对象组成的集合就可以直接使用sort方法排序,sort方法调用compareTo()方法里定义的方法进行排序,Comparable的缺点是只能按一种方式排序

package object;import java.util.*;public class Comparator1 implements Comparable
     
      {        public int i;    public Comparator1(int i){         this.i = i;        }    @Override    public int compareTo(Comparator1 o) //    {              return this.i>o.i?1:-1;    }    public static  void sort(int[] i)    {            }    public static void main(String[] args)    {         Comparator1[] c1 = new Comparator1[]                {                   new Comparator1(9),                   new Comparator1(2),                   new Comparator1(0),                   new Comparator1(4),                   new Comparator1(5),                };        Arrays.sort(c1);        System.out.println(Arrays.toString(c1));        List
      
        list = new ArrayList
       
        (Arrays.asList(1,2,6,2,76));        //Collections.sort(list);        //System.out.println(list);    }    public String toString()    {        return "Comparator1 = " + i;    }}