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                # Java - `LinkedList peek()`,`peekFirst()`和`peekLast()`方法 > 原文: [https://beginnersbook.com/2014/08/java-linkedlist-peek-peekfirst-and-peeklast-methods/](https://beginnersbook.com/2014/08/java-linkedlist-peek-peekfirst-and-peeklast-methods/) #### 描述 `public E peek()`:檢索但不刪除此列表的頭部(第一個元素)。 `public E peekFirst()`:檢索但不刪除此列表的第一個元素,如果此列表為空,則返回`null`。 `public E peekLast()`:檢索但不刪除此列表的最后一個元素,如果此列表為空,則返回`null`。 #### 示例 ```java import java.util.LinkedList; class LinkedListPeekDemo{ public static void main(String[] args) { // Create a LinkedList of Strings LinkedList<String> list = new LinkedList<String>(); // Add few Elements list.add("Element1"); list.add("Element2"); list.add("Element3"); list.add("Element4"); // Display LinkList elements System.out.println("LinkedList before: "+list); //peek() System.out.println(list.peek()); //peekFirst() System.out.println(list.peekFirst()); //peekLast() System.out.println(list.peekLast()); // Should be same as peek methods does not remove System.out.println("LinkedList after: "+list); } } ``` **輸出:** ```java LinkedList before: [Element1, Element2, Element3, Element4] Element1 Element1 Element4 LinkedList after: [Element1, Element2, Element3, Element4] ```
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