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                # Java - 在`LinkedList`的開頭和結尾添加元素 > 原文: [https://beginnersbook.com/2014/07/java-add-elements-at-beginning-and-end-of-linkedlist-example/](https://beginnersbook.com/2014/07/java-add-elements-at-beginning-and-end-of-linkedlist-example/) #### 示例 在這個例子中,我們將學習如何在`LinkedList`的開頭和結尾添加元素。我們將使用`LinkedList`類的[`addFirst()`](https://docs.oracle.com/javase/7/docs/api/java/util/LinkedList.html#addFirst(E))和[`addLast()`方法](https://docs.oracle.com/javase/7/docs/api/java/util/LinkedList.html#addLast(E))。方法定義和描述如下: 1)`public void addFirst(E e)`:在此列表的開頭插入指定的元素。 2)`public void addLast(E e)`:將指定的元素追加到此列表的末尾。 **完整代碼:** ```java import java.util.LinkedList; public class AddExample { 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"); //Displaying LinkedList elements System.out.println(linkedlist); //Adding an element at the beginning linkedlist.addFirst("FIRST"); //Displaying the List after addition System.out.println(linkedlist); //Adding an element at the end of list linkedlist.addLast("LAST"); //Displaying the final list System.out.println(linkedlist); } } ``` 輸出: ```java [AA, BB, CC, DD, EE] [FIRST, AA, BB, CC, DD, EE] [FIRST, AA, BB, CC, DD, EE, LAST] ```
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