java List Sort

根据某一属性排序

1.Vo对象

import java.util.Comparator;


public class VoObject  implements Comparator {

	public VoObject() {
		super();
		// TODO Auto-generated constructor stub
	}

	private String id;
	private String name;
	private String sort;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSort() {
		return sort;
	}
	public void setSort(String sort) {
		this.sort = sort;
	}
	@Override
	public int compare(Object arg0, Object arg1) {
		VoObject c1 = (VoObject) arg0;
		VoObject c2 = (VoObject) arg1;
		
		if(Integer.valueOf(c1.getId()) ==4){
			 return   Integer.valueOf(c1.getSort()) - Integer.valueOf(c2.getSort());
		}else{
			return 0;
		}
//		  if (Integer.valueOf(c1.getId()) - Integer.valueOf(c2.getId())>0) {
//			  return 1;
//		  }else if (Integer.valueOf(c1.getId()) - Integer.valueOf(c2.getId())<0){
//			  return -1;  
//			 
//		 
//		  }else{
//			  return   Integer.valueOf(c1.getSort()) - Integer.valueOf(c2.getSort());
//		  }
		

	}
	public VoObject(String id, String name, String sort) {
		super();
		this.id = id;
		this.name = name;
		this.sort = sort;
	}
	
	
}

 

2.Test类：

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class test1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		List<VoObject> list= new ArrayList();
		VoObject oo=new VoObject("1","aa","2");
		list.add(oo);
		list.add(new VoObject("1","aa","3"));
		list.add(new VoObject("1","aa","1"));
		list.add(new VoObject("1","aa","5"));
		list.add(new VoObject("1","aa","4"));
		list.add(new VoObject("4","aa","3"));
		list.add(new VoObject("4","aa","4"));
		list.add(new VoObject("4","aa","5"));
		list.add(new VoObject("4","aa","2"));
		list.add(new VoObject("4","aa","1"));
		list.add(new VoObject("3","aa","5"));
		list.add(new VoObject("3","aa","4"));
		list.add(new VoObject("3","aa","1"));
		list.add(new VoObject("3","aa","2"));
		list.add(new VoObject("3","aa","3"));
		
		VoObject owo=new VoObject();
		
		 Collections.sort(list,owo);   
		for(int i=0;i<list.size();i++){
			System.out.println(list.get(i).getId()+list.get(i).getName()+list.get(i).getSort()
					);
			
		
			
		}
		
		
	}

}