Java Vector isEmpty() Method with Examples

by Online Tutorials Library July 22, 2022

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

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Java Vector isEmpty() Method with Examples

Java Vector isEmpty() Method

Syntax

Parameter

Return

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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