java list排序

 

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