按姓名倒序和年龄正序排序用户并展示

package _5_13;

class User {

private String name;

private int age;

public User(String name, int age) {

this.name = name;

this.age = age;

}

public String getName() {

return name;

}

public int getAge() {

return age;

}

}

static class MyComparatorName implements Comparator<User> {

@Override

public int compare(User u1, User u2) {

return u1.getName().compareTo(u2.getName()) * -1;

}

}

static class MyComparatorAge implements Comparator<User> {

@Override

public int compare(User u1, User u2) {

return (u1.getAge() - u2.getAge());

}

}

public static void main(String[] args) {

User[] auser = new User[3];

auser[0] = new User("apple", 20);

auser[1] = new User("orange", 10);

auser[2] = new User("banana", 30);

Arrays.sort(auser, new MyComparatorName());

for (User u : auser) {

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

}

Arrays.sort(auser, new MyComparatorAge());

for (User u : auser) {

System.out.println(u.getAge());

}

}