1. 实现comparable接口
    2. 重写compareTo接口 接口中定义排序规则 ```java

    /**

    • @author:LYY 创建时间:2022/5/3 */ public class ComparableTest {

      public static void main(String[] args) {

      1.  Person[] arr = new Person[4];
      3.  arr[0] = new Person(19, "张三", "朝阳大街");
      4.  arr[1] = new Person(17, "李四", "饭都花园");
      5.  arr[2] = new Person(88, "唐人", "唐人街");
      6.  arr[3] = new Person(99, "王五", "天堂办事处");
      8.  Arrays.sort(arr);
      10.  System.out.println(Arrays.toString(arr));

      } }

    class Person implements Comparable{

    1. private int age;
    3. private String name;
    5. private String address;
    7. public Person(int age, String name, String address) {
    8.     this.age = age;
    9.     this.name = name;
    10.     this.address = address;
    11. }
    13. public int getAge() {
    14.     return age;
    15. }
    17. public void setAge(int age) {
    18.     this.age = age;
    19. }
    21. public String getName() {
    22.     return name;
    23. }
    25. public void setName(String name) {
    26.     this.name = name;
    27. }
    29. public String getAddress() {
    30.     return address;
    31. }
    33. public void setAddress(String address) {
    34.     this.address = address;
    35. }
    37. @Override
    38. public String toString() {
    39.     return "Person{" +
    40.             "age=" + age +
    41.             ", name='" + name + '\'' +
    42.             ", address='" + address + '\'' +
    43.             '}';
    44. }
    46. /**
    47.  * 根据person对象的age属性进行比较
    48.  * @param o
    49.  * @return
    50.  */
    51. @Override
    52. public int compareTo(Object o) {
    53.     // 判断形参是否是Person类
    54.     if (o instanceof Person) {
    55.         Person p = (Person) o;
    56.         // 当前对象大于形参 返回正整数
    57.         if (this.age > p.getAge()) {
    58.             return 1;
    59.         } else if (this.age < p.getAge()) {
    60.             return -1;
    61.         } else {
    62.             return 0;
    63.         }
    64.     }
    65.     throw new RuntimeException("参数类型不正确!");
    66. }

    } ```