Java Vector removeAll() Method with Examples

by Online Tutorials Library July 22, 2022

Java Vector removeAll() Method

The removeAll() method of Java Vector class deletes all the elements from the vector that are present in the specified collection.

Syntax

Following is the declaration of removeAll() method:

Parameter

Parameter	Description	Required/Optional
c	It is a collection of elements which will be removed from the vector.	Required

Return

The removeAll() method returns true if the vector changed as a result of the call.

Exceptions

NullPointerException– This method has thrown an exception if the vector contains one or more null elements and the specified collection does not support null elements or if the specified collection is null.

Compatibility Version

Java 1.2 and above

Example 1

  import java.util.Vector;  public class VectorRemoveAllExample1 {    public static void main(String arg[]) {    //Create an empty Vec1          Vector<Integer> vec1 = new Vector<>();          //Add elements in the Vector1          vec1.add(1);          vec1.add(2);          vec1.add(3);          vec1.add(4);          vec1.add(5);           //Displaying the Vector elements          System.out.println(“Vector: ” + vec1);           System.out.println(“Removing all the elements”);           //use removeAll() method          vec1.removeAll(vec1);          //Display the size of the Vector          System.out.println(“Size of the vector: “+vec1.size());           }  }  

Test it Now

Output:

Vector: [1, 2, 3, 4, 5]  Removing all the elements  Size of the vector: 0

Example 2

  import java.util.Vector;  public class VectorRemoveAllExample2 {    public static void main(String arg[]) {    //Create an empty Vec1          Vector<String> vec1 = new Vector<String>();          //Add elements in the Vector1          vec1.add(“A”);          vec1.add(“B”);          vec1.add(“C”);          vec1.add(“10”);          vec1.add(“20”);           //Displaying the Vector1 elements          System.out.println(“Vector: ” + vec1);           //Create an empty Vec2          Vector<String> vec2 = new Vector<String>();           //Add elements in the Vector2          vec2.add(“A”);          vec2.add(“B”);          vec2.add(“C”);           //use removeAll() method          boolean changed = vec1.removeAll(vec2);          //Print the result          if (changed)              System.out.println(“Collection removed”);          else              System.out.println(“Collection not removed”);          //Display the final Vector          System.out.println(“Final Vector: ” + vec1);          }  }  

Test it Now

Output:

Vector: [A, B, C, 10, 20]  Collection removed  Final Vector: [10, 20]

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