자바 링크드리스트

import java.util.*;

class Main
{
public static void main(String[] args)
{
String name;
String phone;
String address;
String newName;
int sel;

LinkedList n1 = new LinkedList();

while(true)
{
System.out.println(`1. 추가`);
System.out.println(`2. 검색`);
System.out.println(`3. 삭제`);
System.out.println(`4. 오른쪽에 추가`);
System.out.println(`5. 왼쪽에 추가`);
System.out.println(`6. 출력`);
System.out.println(`7. 종료`);

Scanner keyboard = new Scanner(System.in);
System.out.print(`메뉴를 선택하세요 : `);
sel = keyboard.nextInt();
System.out.println();