[1028알고리즘]Queue - JAVA

import java.util.HashMap;
import java.util.Map;
 Map<Integer,Integer> wants_dic = new HashMap<>();
 wants_dic.put(1, 1);
 System.out.println(wants_dic.get(1)+1);
 
import java.util.LinkedList;
import java.util.Queue;
 Queue<Integer> queue = new LinkedList<>();
 		 System.out.println(queue.add(1));
         System.out.println(queue.peek());
		 System.out.println(queue.poll());
		 System.out.println(queue.add(1));
		 System.out.println(queue.add(2));
		 System.out.println(queue.remove());
		 queue.clear();