给Java中的List排序

//java list 排序

    //关键词： java list 排序

    //主要用到： Collections.sort方法

package com.tom.compare; import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; public class CompareClient {  /**   * @param args   */  public static void main(String[] args) {   // TODO Auto-generated method stub   List list = new ArrayList();   list.add(new Content(15000,"1asdfasd5000"));   list.add(new Content(10000,"10000"));   list.add(new Content(20000,"20000"));   list.add(new Content(30000,"30000"));   list.add(new Content(25000,"25000"));   list.add(new Content(13000,"13000"));   list.add(new Content(15000,"15000"));   list.add(new Content(89000,"89000"));     ContentComparator comp = new ContentComparator();   Collections.sort(list,comp);     Content content;   for(int i = 0; i < list.size(); i++){    content = (Content)list.get(i);    System.out.println(" content.getName() " + content.getName());   }  } } package com.tom.compare; import java.util.Comparator; public class ContentComparator implements Comparator {  public int compare(Object o1, Object o2) {   // TODO Auto-generated method stub   Content c1 = (Content) o1;   Content c2 = (Content) o2;   if (c1.getKey() > c2.getKey()) {    return 1;   } else {    if (c1.getKey() == c2.getKey()) {     return 0;    } else {     return -1;    }   }  } } package com.tom.compare; public class Content {  private long key;  private String name;  public Content(long key, String name) {   this.key = key;   this.name = name;  }  public long getKey() {   return key;  }  public void setKey(long key) {   this.key = key;  }  public String getName() {   return name;  }  public void setName(String name) {   this.name = name;  } } 结果是:  content.getName() 10000  content.getName() 13000  content.getName() 1asdfasd5000  content.getName() 15000  content.getName() 20000  content.getName() 25000  content.getName() 30000  content.getName() 89000