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2. 浣跨敤鎺掑簭绠楁硶瀵硅嚜瀹氫箟绫诲瀷鐨勯泦鍚堣繘琛屾帓搴忋€?/p>

浠ヤ笅鏄ず渚嬩唬鐮侊細

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

class Person implements Comparable<Person> {
    private String name;
    private int age;
    
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }
    
    public String getName() {
        return name;
    }
    
    public int getAge() {
        return age;
    }
    
    @Override
    public int compareTo(Person p) {
        // 鏍规嵁骞撮緞杩涜鎺掑簭
        if (this.age < p.getAge()) {
            return -1;
        } else if (this.age > p.getAge()) {
            return 1;
        } else {
            return 0;
        }
    }
}

public class Main {
    public static void main(String[] args) {
        List<Person> personList = new ArrayList<>();
        personList.add(new Person("Alice", 25));
        personList.add(new Person("Bob", 30));
        personList.add(new Person("Charlie", 20));
        
        // 浣跨敤 Collections.sort 鏂规硶瀵归泦鍚堣繘琛屾帓搴?/span>
        Collections.sort(personList);
        
        for (Person p : personList) {
            System.out.println(p.getName() + " - " + p.getAge());
        }
    }
}

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