比较器

import java.util.Arrays;

public class MyComparable {

    static class PersonComparable implements
                                  Comparable<PersonComparable>{
        int nAge;
        String strName;

        public PersonComparable(int nAge, String strName) {
            this.nAge = nAge;
            this.strName = strName;
        }

        @Override
        public String toString() {
            return "Person{" +
                    "nAge=" + nAge +
                    ", strName='" + strName + '\'' +
                    '}';
        }

        @Override
        public int compareTo(PersonComparable o) {
            //自定义比较规则
            if (this.nAge>o.nAge){
                return -1;
            }else if(this.nAge<o.nAge){
                return 1;
            }else
                return 0;
        }
    }

    public static void main(String[] args) {

//定义Person数组
        PersonComparable[] persons = new PersonComparable[]
                {new PersonComparable(20,"小张"),
                        new PersonComparable(25,"小红"),
                        new PersonComparable(23,"小李"),
                        new PersonComparable(19,"小明")};

        //对数组进行排序
        Arrays.sort(persons);
        //输出
        for (PersonComparable person1:persons){
            System.out.println(person1.toString());
        }
    }


}