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java:list排序

第一种方法:就是list中对象(bean文件)实现Comparable接口,代码如下:

package com.mapred.entity;public class Bar implements Comparable<Bar>{	private String id; 	private String hexValue  ;	public String getId() {		return id;	}	public void setId(String id) {		this.id = id;	}	public String getHexValue() {		return hexValue;	}	public void setHexValue(String hexValue) {		this.hexValue = http://www.mamicode.com/hexValue;>

 调用

	StringBuffer buffer = new StringBuffer("");		 Collections.sort(list);		for(int i=0;i<list.size();i++){			Bar bar=list.get(i);			String lineHex=bar.getHexValue();			buffer.append(lineHex);		}

第二种方法,就是在重载Collections.sort方法,代码如下:

public class Person {    private String name;    private Integer order;     public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }     public Integer getOrder() {        return order;    }    public void setOrder(Integer order) {        this.order = order;    }}

  调用

public static void main(String[] args) {        List<Person> listA = new ArrayList<Person>();        Person p1 = new Person();        Person p2 = new Person();        Person p3 = new Person();         p1.setName("name1");        p1.setOrder(1);        p2.setName("name2");        p2.setOrder(2);        p3.setName("name3");        p3.setOrder(3);         listA.add(p2);        listA.add(p1);        listA.add(p3);                 Collections.sort(listA, new Comparator<Person>() {            public int compare(Person arg0, Person arg1) {                return arg0.getOrder().compareTo(arg1.getOrder());            }        });                 for (Person p : listA) {            System.out.println(p.getName());        }    }

 

  

 

java:list排序