Java按照List内存储的对象的某个字段进行排序

关键点：将List内存储的对象实现Comparable类，重写它的compareTo（）方法即可

Bean：

package chc;
public class StuVo implements Comparable{
?private String id;
?private String name;
?private Integer age;
?public StuVo(String id, String name, Integer age) {
? this.id=id;
? this.name=name;
? this.age=age;
?}
?public int compareTo(StuVo stu) {
? return this.name.compareTo(stu.getName());
?}
?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 Integer getAge() {
? return age;
?}
?public void setAge(Integer age) {
? this.age = age;
?}
}

Demo：

package chc;

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

public class ArrayListSortDemo {
?public static void main(String[] args) {
? List stuList=new ArrayList();
? StuVo stu=new StuVo("1","h小明",11);
? stuList.add(stu);
?
? stu=new StuVo("2","d阿熊",15);
? stuList.add(stu);
?
? stu=new StuVo("3","a张三",10);
? stuList.add(stu);
?
? stu=new StuVo("4","b李四",15);
? stuList.add(stu);
?
? Collections.sort(stuList);
?
? Iterator it =stuList.iterator();
? while(it.hasNext()){
? ?System.out.println(it.next().getName());
? }
?}
}