List的排序 Collection.sort( )

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