Java Vector insertElementAt() Method with Examples

by Online Tutorials Library July 22, 2014

Java Vector insertElementAt() Method

The insertElementAt() method of Java Vector class is used to insert the specified object as a component in this vector at the specified index. Each component in the vector with an index greater or equal to the given index is shifted upward. Now, the vector index is one greater than the value it had previously.

Syntax

Following is the declaration of insertElementAt() method:

Parameter

Parameter	Description	Required/Optional
obj	It is the element which will be inserted.	Required
index	It is the index where we will insert the new element.	Required

Return

The insertElementAt() method does not return anything. It only inserts an element at the given index.

Exceptions

ArrayIndexOutOfBoundsException– This method has thrown an exception if the index is out of range i.e. index < 0 || index >= size().

Compatibility Version

Java 1.2 and above

Example 1

  import java.util.*;  public class VectorInsertElementAtExample1 {    public static void main(String arg[]) {      //Create an empty vector      Vector<Integer> vec = new Vector<>();      //Add element in the vector      vec.add(10);      vec.add(20);      vec.add(30);          vec.add(40);      vec.add(50);      //Printing the element      System.out.println(“Element in vector before insertion = “+vec);      //Insert the element at 2nd position      vec.insertElementAt(700, 2);      System.out.println(“Element in vector after insertion = “+vec);           }              }  

Test it Now

Output:

Element in vector before insertion = [10, 20, 30, 40, 50]  Element in vector after insertion = [10, 20, 700, 30, 40, 50]

Example 2

  import java.util.*;  public class VectorInsertElementAtExample2 {    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”);            //Print the elements of this vector      System.out.println(“Components of vector: “);            for (String program : vec) {                         System.out.println(” ” +program);            }                //Insert the element at 2nd position            vec.insertElementAt(“PHP”, 1);      System.out.println(“Components of vector after insertion = “);       for (String program : vec) {                       System.out.println(” ” +program);            }   }              }  

Test it Now

Output:

Components of vector:    Java   Ruby   Android   Python  Components of vector after insertion =    Java   PHP   Ruby   Android   Python

Example 3

  import java.util.*;  public class VectorInsertElementAtExample3 {    public static void main(String arg[]) {      //Create an empty vector      Vector < String > colors = new Vector < String > ();      //Add elements in the vector            colors.add(“White”);            colors.add(“Green”);            colors.add(“Black”);            //Print the elements of this vector            System.out.println(“Color elements in vector: ” +colors);      //Insert the element at 2nd position      colors.insertElementAt(“Red”, 12);      System.out.println(“Element in vector after insertion = “+colors);           }              }  

Test it Now

Output:

Color elements in vector: [White, Green, Black]  Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 12 > 3  at java.base/java.util.Vector.insertElementAt(Vector.java:619)  at myPackage.VectorInsertElementAtExample3.main(VectorInsertElementAtExample3.java:14)

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Java Vector insertElementAt() Method with Examples

Java Vector insertElementAt() Method

Syntax

Parameter

Return

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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