Java Vector clear() method example

In this source code example, we will demonstrate the usage of the Vector clear() method in Java with an example.

Vector java.util.Vector.clear() Method

The java.util.Vector.clear() method is used to remove all the elements from a Vector. Using the clear() method only clears all the elements from the vector and does not delete the vector. In other words, we can say that the clear() method is used to only empty an existing vector.

java.util.Vector.clear() Method Example

The below program illustrates the working of java.util.Vector.clear() method:

import java.util.*; 

public class VectorDemo { 
    public static void main(String args[]) 
    { 
    
        // Creating an empty Vector 
        Vector programLangs = new Vector(); 
    
        // Use add() method to add elements in the vector 
        programLangs.add("C"); 
        programLangs.add("C++"); 
        programLangs.add("Java"); 
        programLangs.add("Python"); 
        programLangs.add("Go"); 
    
        // Output the present vector 
        System.out.println("The vector is: " + programLangs); 
    
        // Clearing the Vector using clear() method 
        programLangs.clear(); 
    
        // Displaying the final vector after clearing; 
        System.out.println("The final Vector: " + programLangs); 
    } 
}  

    

Output:

The vector is: [C, C++, Java, Python, Go]
The final Vector: []   
    

Example 2: Vector with Integer Numbers

    
import java.util.*; 

public class VectorDemo { 
    public static void main(String args[]) 
    { 
    
        // Creating an empty Vector 
        Vector primeNo = new Vector(); 
    
        // Use add() method to add elements into the Queue 
        primeNo.add(2); 
        primeNo.add(3); 
        primeNo.add(5); 
        primeNo.add(7); 
        primeNo.add(11); 
    
        // Displaying the Vector 
        System.out.println("Vector: " + primeNo); 
    
        // Clearing the Vector using clear() method 
        primeNo.clear(); 
    
        // Displaying the final vector after clearing; 
        System.out.println("The final Vector: " + primeNo); 
    } 
} 
    

Output:

Vector: [2, 3, 5, 7, 11]
The final Vector: []

References

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/Vector.html