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Java program to insert an item into Vector collection at the specified index

Java example to insert an item into Vector collection at the specified index.
Submitted by Nidhi, on May 18, 2022

Problem Solution:

In this program, we will create an object of the Vector class to store different types of objects. Then we will add objects using add() method. After that, we will insert an item into the Vector collection at the specified index using add() method and print the updated vector.

Program/Source Code:

The source code to insert an item into Vector collection at a specified index is given below. The given program is compiled and executed successfully.

// Java program to insert an item into Vector collection 
// at the specified index

import java.util.*;

public class Main {
  public static void main(String[] args) {
    Vector vec = new Vector();

    vec.add(10);
    vec.add(20.5);
    vec.add(true);

    System.out.println("Vector Elements:");
    for (Object obj: vec) {
      System.out.println("  " + obj);
    }

    vec.add(1, "Hello World");

    System.out.println("Vector Elements after insertion:");
    for (Object obj: vec) {
      System.out.println("  " + obj);
    }
  }
}

Output:

Vector Elements:
  10
  20.5
  true
Vector Elements after insertion:
  10
  Hello World
  20.5
  true

Explanation:

In the above program, we imported the "java.util.*" package to use the Vector class. Here, we created a public class Main.

The Main class contains a main() method. The main() method is the entry point for the program. And, created an object vec of the Vector class. Then we used add() method to add and insert an item at the specified index.  Here, we inserted the "Hello World" string at index 1 using add() method and printed the updated vector.

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