# Java - 檢查`LinkedList`中是否存在特定元素 > 原文： [https://beginnersbook.com/2014/07/java-check-if-a-particular-element-exists-in-linkedlist-example/](https://beginnersbook.com/2014/07/java-check-if-a-particular-element-exists-in-linkedlist-example/) 在這個例子中，我們將看到如何使用[`contains()`方法](https://docs.oracle.com/javase/7/docs/api/java/util/LinkedList.html#contains(java.lang.Object))檢查[`LinkedList`](https://beginnersbook.com/2013/12/linkedlist-in-java-with-example/)中是否存在特定元素： `public boolean contains(Object o)`：如果此列表包含指定的元素，則返回`true`。更正式地，當且僅當此列表包含至少一個元素`e`時才返回`true`（`o == null? e == null: o.equals(e)`）。 ```java import java.util.LinkedList; public class CheckLinkedList { public static void main(String[] args) { // Creating LinkedList of String Elements LinkedList<String> linkedlist = new LinkedList<String>(); // Populating it with String values linkedlist.add("AA"); linkedlist.add("BB"); linkedlist.add("CC"); linkedlist.add("DD"); linkedlist.add("EE"); // contains() method checks whether the element exists if (linkedlist.contains("CC")) { System.out.println("Element CC is present in List"); } else { System.out.println("List doesn't have element CC"); } //Checking for element FF if (linkedlist.contains("FF")) { System.out.println("Element FF is present in List"); } else { System.out.println("List doesn't have element FF"); } } } ``` 輸出： ```java Element CC is present in List List doesn't have element FF ```