package Demo_2_7_Comparable比较接口;
import java.util.Arrays;
public class Main {
public static void main(String[] args) {
Person[] data = new Person[]{
new Person("张三-A",19),
new Person("李四-B",21),
new Person("王五-C",12)
};
Arrays.sort(data);
System.out.println(Arrays.toString(data));
}
}
class Person implements Comparable<Person>{
private String name;
private int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
@Override
public int compareTo(Person person) {
return this.age - person.age;
}
@Override
public String toString() {
return "name: " + this.name + "\tage: " + this.age;
}
}
面试题:
请解释Comparable 与 Comparator的区别?
- java.lang.Comparable是在类定义的时候实现的父接口,主要用于定义排序规则,里面只有一个compareTo()方法
- java.util.Comparator是挽救的比较器操作,需要设置单独的比较器规则类实现排序,里面有compare()方法