Java找不到带有链表的符号 [英] Java cannot find symbol with linked list

问题描述

我想问一个列表是否包含某个字符串.

I am trying to ask if a list contains a certain string.

public void searchList(Scanner scan, Object list){


    System.out.println("Search for element:\t");
    String p = scan.nextLine();

    if (list.contains(p))
        System.out.println(p + " is in the list");
    else
        System.out.println(p + " is not in the list.");
}

我得到:

Prog7Methods.java:23: cannot find symbol
symbol  : method contains(java.lang.String)
location: class java.lang.Object
        if (list.contains(p))

我不明白！我已经导入了java.io. *和java.util.*，它怎么无法识别呢?

I do not understand! I have imported java.io.* and java.util.* how does it not recognize this?

推荐答案

您需要将列表声明为List.代替

You need to declare the list as a List. Instead of

public void searchList(Scanner scan, Object list){

使用

public void searchList(Scanner scan, List list){

甚至更好:

 public void searchList(Scanner scan, List<String> list){

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