Java Vector clear()用法及代码示例

Java.util.Vector.clear()方法用于从Vector中删除所有元素。使用clear()方法仅清除向量中的所有元素，而不会删除向量。换句话说，可以说clear()方法仅用于清空现有矢量。

用法:

Vector.clear()

参数：该方法不带任何参数

返回值：该函数不返回任何值。

以下示例程序旨在说明Java.util.Vector.clear()方法。

示例1:

// Java code to illustrate clear() 
import java.util.*; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        // Creating an empty Vector 
        Vector<String> vt = new Vector<String>(); 
  
        // Use add() method to add elements into the Vector 
        vt.add("Welcome"); 
        vt.add("To"); 
        vt.add("Geeks"); 
        vt.add("4"); 
        vt.add("Geeks"); 
  
        // Displaying the Vector 
        System.out.println("Vector: " + vt); 
  
        // Clearing the Vector using clear() method 
        vt.clear(); 
  
        // Displaying the final vector after clearing; 
        System.out.println("The final Vector: " + vt); 
    } 
}

输出：

Vector: [Welcome, To, Geeks, 4, Geeks]
The final Vector: []

示例2:

// Java code to illustrate clear() 
import java.util.*; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        // Creating an empty Vector 
        Vector<Integer> vt = new Vector<Integer>(); 
  
        // Use add() method to add elements into the Queue 
        vt.add(10); 
        vt.add(15); 
        vt.add(30); 
        vt.add(20); 
        vt.add(5); 
  
        // Displaying the Vector 
        System.out.println("Vector: " + vt); 
  
        // Clearing the Vector using clear() method 
        vt.clear(); 
  
        // Displaying the final vector after clearing; 
        System.out.println("The final Vector: " + vt); 
    } 
}

输出：

Vector: [10, 15, 30, 20, 5]
The final Vector: []

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注：本文由纯净天空筛选整理自kundankumarjha大神的英文原创作品 Vector clear() Method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。