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                # 使用索引替換`Vector`元素 > 原文: [https://beginnersbook.com/2014/06/replace-vector-elements-using-index-java-example/](https://beginnersbook.com/2014/06/replace-vector-elements-using-index-java-example/) 在本教程中,我們將了解如何替換`Vector`元素。我們將使用[`Vector`類](https://beginnersbook.com/2013/12/vector-in-java/)的`set()`方法來做到這一點。 `public E set(int index, E element)`:用指定的元素替換此`Vector`中指定位置的元素。 #### 示例 在這個例子中,我們用新值替換`Vector`的第 2 和第 3 個元素。 ```java import java.util.Vector; public class ReplaceElements { public static void main(String[] args) { Vector<String> vector = new Vector<String>(); vector.add("Harry"); vector.add("Steve"); vector.add("Vince"); vector.add("David"); vector.add("Matt"); System.out.println("Vector elements before replacement: "); for(int i=0; i < vector.size(); i++) { System.out.println(vector.get(i)); } //Replacing index 1 element vector.set(1,"Mark"); //Replacing index 2 element vector.set(2,"Jack"); System.out.println("Vector elements after replacement: "); for(int i=0; i < vector.size(); i++) { System.out.println(vector.get(i)); } } } ``` **輸出:** ```java Vector elements before replacement: Harry Steve Vince David Matt Vector elements after replacement: Harry Mark Jack David Matt ```
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