Java Vector clear()用法及代碼示例

Java.util.Vector.clear()方法用於從Vector中刪除所有元素。使用clear()方法僅清除向量中的所有元素，而不會刪除向量。換句話說，可以說clear()方法僅用於清空現有矢量。

用法:

Vector.clear()

參數：該方法不帶任何參數

返回值：該函數不返回任何值。

以下示例程序旨在說明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); 
    } 
}

輸出：

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); 
    } 
}

輸出：

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

相關用法

注：本文由純淨天空篩選整理自kundankumarjha大神的英文原創作品 Vector clear() Method in Java。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。