Java根据实体类的某一个属性进行排序

• 实体类

/**
 * 用户实体类
 */
public class UserEntity {

    private int id;

    private String username;

    private String sex;

    private int age;

    private String address;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    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 getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public UserEntity(int id, String username, String sex, int age, String address) {
        this.id = id;
        this.username = username;
        this.sex = sex;
        this.age = age;
        this.address = address;
    }

    @Override
    public String toString() {
        return "UserEntity{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", sex='" + sex + '\'' +
                ", age=" + age +
                ", address='" + address + '\'' +
                '}';
    }
}

• 未排序

 public static void main(String[] args) {
        UserEntity userEntity1 = new UserEntity(0, "张晓红","女",1 , "beijignshi");
        UserEntity userEntity2 = new UserEntity(1, "李晓红","女",1 , "tianjinshi");
        UserEntity userEntity3 = new UserEntity(3, "项羽","男",2 , "chuguo");
        UserEntity userEntity4 = new UserEntity(4, "刘邦","男",2 , "hanchao");

        List<UserEntity> list = new ArrayList<>();
        list.add(userEntity2);
        list.add(userEntity1);
        list.add(userEntity4);
        list.add(userEntity3);

        System.out.println(Objects.toString(list));
    }
    输出结果：
    	[UserEntity{id=1, username='李晓红', sex='女', age=1, address='tianjinshi'}, 
    	UserEntity{id=0, username='张晓红', sex='女', age=1, address='beijignshi'}, 
    	UserEntity{id=4, username='刘邦', sex='男', age=2, address='chuguo'}, 
    	UserEntity{id=3, username='项羽', sex='男', age=2, address='hanchao'}]

• Collections排序后

public static List<UserEntity> sort(List<UserEntity> list){
        //根据指定比较器产生的顺序对指定列表进行排序。
        Collections.sort(list, new Comparator<UserEntity>() {
            @Override
            public int compare(UserEntity o1, UserEntity o2) {
                //获取所需语言环境的 Collator，根据所需切换其他语言环境
                //Collator collator = Collator.getInstance(Locale.ENGLISH);
                //return collator.compare(o1.getAddress(), o2.getAddress());
                Collator collator = Collator.getInstance(Locale.CANADA);
                return collator.compare(o1.getUsername(), o2.getUsername());
            }
        });
        return list;
    }
输出结果： 
	[UserEntity{id=4, username='刘邦', sex='男', age=2, address='hanchao'}, 
	UserEntity{id=0, username='张晓红', sex='女', age=1, address='beijignshi'}, 
	UserEntity{id=1, username='李晓红', sex='女', age=1, address='tianjinshi'}, 
	UserEntity{id=3, username='项羽', sex='男', age=2, address='chuguo'}]