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

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

Problem statement

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 replace the item into Vector collection at the specified index using replace() method and print the updated vector.

Source Code

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

// Java program to replace 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.set(1, "Hello World");

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

Output

Vector Elements:
  10
  20.5
  true
Updated Vector Elements:
  10
  Hello World
  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 items to the vector collection. After that, we replaced the item at index 1 using the set() method and printed the updated vector.

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