Collections.sort()对list进行排序

POJO类：

class User{

private String name;

private Integer age;

private Date date;

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;

}

public Date getDate() {

return date;

}

public void setDate(Date date) {

this.date = date;

}

}

测试类Test：

SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");

List users = new ArrayList();

User u = new User();

u.setAge(Integer.valueOf(1));

u.setName("a");

u.setDate(new Date());

users.add(u);

u = new User();

u.setAge(Integer.valueOf(2));

u.setName("b");

u.setDate(sdf.parse("2012-12-12"));

users.add(u);

Collections.sort(users, new Comparator() {

public int compare(User arg0, User arg1){

return arg0.getDate().compareTo(arg1.getDate());

}

});

for (User user : users) {

System.out.println(user.getName());

}