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                # 如何設置`Vector`大小 > 原文: [https://beginnersbook.com/2014/06/how-to-set-vector-size-example/](https://beginnersbook.com/2014/06/how-to-set-vector-size-example/) 我們可以使用[`Vector`類](https://beginnersbook.com/2013/12/vector-in-java/)的`setSize()`方法設置`Vector`的大小。如果新大小大于當前大小,則當前大小索引之后的所有元素都具有空值。如果新大小小于當前大小,則已從`Vector`中刪除當前大小索引之后的元素。 #### 示例 `Vector`最初有 5 個元素。我們將大小設置為 10,因此在`Vector`的末尾插入了 5 個`null`元素。 在程序的第二部分,我們將大小設置為 4(小于當前大小 10),因此最后六個元素從`Vector`中刪除(包括`null`元素)。 ```java import java.util.Vector; public class SetSizeExample { public static void main(String[] args) { // Create a Vector Vector<String> vector = new Vector<String>(); //Add elements to Vector vector.add("Walter"); vector.add("Anna"); vector.add("Hank"); vector.add("Flynn"); vector.add("Tom"); //Setting up the size greater than current size vector.setSize(10); System.out.println("Vector size: "+vector.size()); System.out.println("Vector elements: "); for(int i=0; i < vector.size(); i++){ //get(i) method fetches the element from index i System.out.println(vector.get(i)); } //Setting up the size less than current size vector.setSize(4); System.out.println("\nVector size: "+vector.size()); System.out.println("Vector elements: "); for(int i=0; i < vector.size(); i++){ System.out.println(vector.get(i)); } } } ``` **輸出:** ```java Vector size: 10 Vector elements: Walter Anna Hank Flynn Tom null null null null null Vector size: 4 Vector elements: Walter Anna Hank Flynn ```
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