Java Vector isEmpty() Method

The isEmpty() method of Java Vector class is used to check if this vector has no components. It returns true if the vector is empty, otherwise returns false.

Syntax

Following is the declaration of isEmpty() method:

Parameter

This method does not accept any parameter.

Return

The isEmpty() method returns true if and only if this vector has no components, otherwise returns false.

Exceptions

Compatibility Version

Java 1.2 and above

Example 1

import java.util.*;
public class VectorIsEmptyExample1 {  
	public static void main(String arg[]) {	
	    //Create an empty vector
	    Vector < String > vec = new Vector < String > ();
	    //Add elements in the vector
	    vec.add("Java");
	    vec.add("Ruby");
	    vec.add("Android");
	    vec.add("Python");
	    //Displaying the Vector
          System.out.println("Vector:  " + vec);
          //Verifying if the Vector is empty or not
          System.out.println("Is the Vector empty? = " +vec.isEmpty());
          //Clear the Vector
          vec.clear(); 
          //Displaying the Vector Again
          System.out.println("Vector after clear(): " +vec); 
          //Verifying if the Vector is empty or not
          System.out.println("Is the Vector empty? = " +vec.isEmpty());
	    }            
}

Test it Now

Output:

Vector:  [Java, Ruby, Android, Python]
Is the Vector empty? = false
Vector after clear(): []
Is the Vector empty? = true

Example 2

import java.util.*;
public class VectorIsEmptyExample2 {  
	public static void main(String arg[]) {	
		//Create an empty Vector with initial capacity of 5      
		Vector<Integer> vecObject = new Vector<Integer>(5);	
		//Display the Vector
            System.out.println("Vector: " +vecObject);
            //Verifying if the Vector is empty or not
            System.out.println("Is the Vector empty? = " +vecObject.isEmpty());       
	      }            
}

Test it Now

Output:

Vector: []
Is the Vector empty? = true

Example 3

import java.util.*;
public class VectorIsEmptyExample3 {  
	public static void main(String arg[]) {	
	    //Create an empty Vector      
	    Vector < String > colors = new Vector < String > ();
	    //Add color elements in the vector
          colors.add("Red");
          colors.add("Green");
          colors.add("Blue");
          colors.add("Pink");
          //Test the vector if it has no components
          System.out.println("Vector isEmpty() before? " +colors.isEmpty());
          //Remove all elements from the vector
          colors.removeAllElements();
          //Again test the vector if it has no components
          System.out.println("Vector isEmpty() after ? " +colors.isEmpty());      
	    }            
}

Test it Now

Output:

Vector isEmpty() before? false
Vector isEmpty() after ? true

Next TopicJava Vector

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