Java collections.sort（）根据时间排序list

首先：定义bean然后：定义比较器最后：测试使用一.userBeanpackage com.butterfly.Class;public class user {
private String name;
private String sex;
private int age;
private String birthday;

public user（String name,String sex,int age,String birthday）{
this.name = name;
this.sex = sex;
this.age = age;
this.birthday = birthday;
}
public String getName（） {
return name;
}
public void setName（String name） {
this.name = name;
}
public String getSex（） {
return sex;
}
public void setSex（String sex） {
this.sex = sex;
}
public int getAge（） {
return age;
}
public void setAge（int age） {
this.age = age;
}
public String getBirthday（） {
return birthday;
}
public void setBirthday（String birthday） {
this.birthday = birthday;
}

}二.定义比较器package com.butterfly.Class;import java.util.Comparator;public class sortClass implements Comparator{
public int compare（Object arg0,Object arg1）{
user user0 = （user）arg0;
user user1 = （user）arg1;
int flag = user0.getBirthday（）.compareTo（user1.getBirthday（））;
return flag;
}
}三.测试使用package com.butterfly.Class;import java.util.ArrayList;
import java.util.Collections;
import java.util.List;public class testClass {
public static void main（String[] args）{
List userList = new ArrayList（）;
userList.add（new user（"吴光雷","男",25,"19871028"））;
userList.add（new user（"吴桥","男",22,"19900923"））;
userList.add（new user（"陆晓敏","男",25,"19870728"））;
userList.add（new user（"王佳俊","男",23,"19890728"））;
userList.add（new user（"秦菁","女",23,"19891212"））;

sortClass sort = new sortClass（）;
Collections.sort（userList,sort）;
for（int i=0;i<userList.size（）;i++）{
user temp = （user）userList.get（i）;
System.out.println（"姓名:"+temp.getName（）+",生日:"+temp.getBirthday（））;
}
}
}输出结果：姓名:陆晓敏,生日:19870728
姓名:吴光雷,生日:19871028
姓名:王佳俊,生日:19890728
姓名:秦菁,生日:19891212
姓名:吴桥,生日:19900923