List集合对象中按照不同属性大小排序的实例

package com.huad.luck;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;public class Test {	public static void main(String[] args) {		Person p = new Person();		p.setName("tom");		p.setAge(11);		Person p1 = new Person();		p1.setName("lilei");		p1.setAge(19);		Person p2 = new Person();		p2.setName("json");		p2.setAge(15);		List<Person> list =new ArrayList<Person>();		list.add(p);		list.add(p1);		list.add(p2);		Collections.sort(list,new Comparator<Person>() {			//这里可以再Person中实现 Comparator<T>接口，重写compare方法			@Override			public int compare(Person o1, Person o2) {				//这里按照名字排序				 return o1.getName().compareTo(o2.getName()); 				 //这里按照age排序				 //return (o1.getAge()+"").compareTo(o2.getAge()+""); 				 //。。。根据不同属性值排序			}  		});		for (int i = 0; i < list.size(); i++) {			System.out.println(list.get(i).getName());		}	}}//Person类package com.huad.luck;public class Person{	private String name ;	private int age;		public Person(String name , int age) {		this.name = name;		this.age = age;	}	public Person( ) {	}	public String getName() {		return name;	}	public void setName(String name) {		this.name = name;	}	public int getAge() {		return age;	}	public void setAge(int age) {		this.age = age;	}}<p style="padding-top: 0px; padding-bottom: 0px; margin-top: 8px; margin-bottom: 8px; line-height: 22.5px; letter-spacing: 0.5px; font-size: 12.5px; word-wrap: break-word; word-break: break-all; color: rgb(51, 51, 51); font-family: 'Microsoft YaHei', Verdana, sans-serif, 宋体;"><span style="padding: 0px; margin: 0px; letter-spacing: normal; font-stretch: normal; font-size: 14px; line-height: 24px; font-family: Tahoma; color: rgb(0, 0, 0);">用collection.sort（）方法对list集合排序</span><br style="padding: 0px; margin: 0px;" /></p><p style="padding-top: 0px; padding-bottom: 0px; margin-top: 0px; margin-bottom: 0px; line-height: 24px; font-size: 14px; word-wrap: break-word; word-break: break-all; font-stretch: normal; font-family: Tahoma;"><span style="padding: 0px; margin: 0px; list-style: none outside none; word-wrap: break-word; word-break: normal;"><span style="padding: 0px; margin: 0px; list-style: none outside none; line-height: 21px; word-wrap: break-word; word-break: normal;"></span></span></p><p style="padding-top: 0px; padding-bottom: 0px; margin-top: 1em; margin-bottom: 0.5em; line-height: 24px; font-size: 14px; word-wrap: break-word; word-break: break-all; font-stretch: normal; font-family: Tahoma;">第一种是list中的对象实现Comparable接口，如下：<span style="padding: 0px; margin: 0px; list-style: none outside none; word-wrap: break-word; word-break: normal;"> </span></p><pre class="java" style="padding: 5px; margin-top: 0px; margin-bottom: 0px; line-height: 18px; font-size: 9pt; font-family: 'Courier New', Arial; border: 1px solid rgb(221, 221, 221); color: rgb(51, 51, 51); background: rgb(246, 246, 246);">/** * 根据order对User排序 */ public class User implements Comparable<User>{   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;   }   public int compareTo(User arg0) {     return this.getOrder().compareTo(arg0.getOrder());   } }

public class Test{  public static void main(String[] args) {     User user1 = new User();     user1.setName("a");     user1.setOrder(1);     User user2 = new User();     user2.setName("b");     user2.setOrder(2);     List<User> list = new ArrayList<User>();     //此处add user2再add user1     list.add(user2);     list.add(user1);     Collections.sort(list);     for(User u : list){       System.out.println(u.getName());     }   } }

/** * 根据order对User排序 */ public class User { //此处无需实现Comparable接口   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;   } }

public class Test{   public static void main(String[] args) {     User user1 = new User();     user1.setName("a");     user1.setOrder(1);     User user2 = new User();     user2.setName("b");     user2.setOrder(2);     List<User> list = new ArrayList<User>();     list.add(user2);     list.add(user1);         Collections.sort(list,new Comparator<User>(){       public int compare(User arg0, User arg1) {         return arg0.getOrder().compareTo(arg1.getOrder());       }     });     for(User u : list){       System.out.println(u.getName());     }   } }

Collections.sort(list,new Comparator<User>(){ public int compare(User arg0, User arg1) { // 第一次比较专业 int i = arg0.getOrder().compareTo(arg1.getOrder());// 如果专业相同则进行第二次比较 if(i==0){ // 第二次比较 int j=arg0.getXXX().compareTo(arg1.getXXX()); // 如果学制相同则返回按年龄排序 if(j==0){ return arg0.getCCC().compareTo(arg1.getCCC()); } return j; } return i; } });

package test;import java.util.ArrayList; import java.util.Collections; import java.util.Comparator;public class ArrayListTest { public static void main(String[] args) { ArrayList<Exmployee> arrayList = new ArrayList<Exmployee>() ; arrayList.add(new Exmployee("zengqiang",new Integer(5000))) ; arrayList.add(new Exmployee("zengmin",new Integer(4000))) ; arrayList.add(new Exmployee("liuxiaojuan",new Integer(4200))) ; arrayList.add(new Exmployee("giuming",new Integer(2200))) ; Collections.sort(arrayList, new Comparator<Exmployee>(){ public int compare(Exmployee arg0, Exmployee arg1) { return arg1.getSalary()-arg0.getSalary() ; //按照工资升序 //return arg0.getSalary()-arg1.getSalary() ; 按照工资降序 //return arg0.getName().compareTo(arg1.getName()) ; 按照姓名升序 } }); for(Exmployee e:arrayList) System.out.println(e.getName()+"'s salary is "+e.getSalary()) ; }}class Exmployee { public Exmployee(String name, int salary) { this.name = name ; this.salary = salary ; }private String name;public String getName() { return name; }public void setName(String name) { this.name = name; }public int getSalary() { return salary; }public void setSalary(int salary) { this.salary = salary; }private int salary; }