在一些程式題中

我們有時候遇到需要在Main類中使用成員內部類

如何在不物件化我們的Main類的前提下使用成員內部類呢？

示例程式碼如下：

package p1068;


import java.util.ArrayList;
import java.util.LinkedList;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.Scanner;
import java.util.Stack;


public class Main {


	public static void main(String[] args) {
		// TODO Auto-generated method stub


		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int m = scanner.nextInt();
		m = (int) (m *1.5);
			
		PriorityQueue<Integer> people = new PriorityQueue<>();
		ArrayList<Person> persons = new ArrayList<>();
		int size = 0;
		int id;
		int score;
		for(int i=0; i<n; i++) {
			id = scanner.nextInt();
			score = scanner.nextInt();
			people.offer(score);
			
			boolean flag = false;
			for(int j=0; j<size; j++) {
				if(persons.get(j).score == score) {
					persons.get(j).id.offer(id);
					flag = true;
					break;
				}
			}
			if(!flag) {
				Person person2 = new Main().new Person();
				person2.score = score;
				person2.id.offer(id);
				persons.add(person2);
				size++;
			}
		}
		
		Stack<Integer> people2 = new Stack<>();
		for(int i=0; i<n; i++) {
			people2.push(people.poll());
		}


		Queue<Integer> people3 = new LinkedList<>();
		int temp = 0;
		for(int i=0; i<m; i++) {
			temp = people2.peek();
			people3.offer(people2.pop());
		}
		while(temp == people2.peek()) {
			people3.offer(people2.pop());
		}
		
		System.out.println(temp + " " + people3.size());


		int temp2 = -1;
		for(int i=0; i<m; i++) {
			if(temp2 != people3.peek()) {
				temp2 =people3.peek();
			}else {
				people3.poll();
				continue;
			}
			for(Person person2 : persons) {
				if(person2.score == people3.peek()) {
					int w = person2.id.size();
					while(!person2.id.isEmpty()) {
						System.out.println(person2.id.poll() + " " +  person2.score);
					}
					people3.poll();
					break;
				}
			}
		}
	}
	
	private  class Person{
		
		PriorityQueue<Integer> id = new PriorityQueue<>();
		int score;
	}


}