Last Updated : 11 Jul, 2025
The Java.util.Vector.set() method is used to replace any particular element in the vector, created using the Vector class, with another element.
Syntax:
Vector.set(int index, Object element)
Parameters: This function accepts two mandatory parameters as shown in the above syntax and described below.
Return Value: The method returns the previous value from the vector that is replaced with the new value.
Below programs illustrate the Java.util.Vector.set() method:
Program 1:
Java
// Java code to illustrate set()
import java.util.*;
public class VectorDemo {
public static void main(String args[])
{
// Creating an empty Vector
Vector<String> vec_tor = new Vector<String>();
// Use add() method to add elements in the vector
vec_tor.add("Geeks");
vec_tor.add("for");
vec_tor.add("Geeks");
vec_tor.add("10");
vec_tor.add("20");
// Displaying the Vector
System.out.println("Vector: " + vec_tor);
// Using set() method to replace Geeks with GFG
System.out.println("The Object that is replaced is: "
+ vec_tor.set(2, "GFG"));
// Using set() method to replace 20 with 50
System.out.println("The Object that is replaced is: "
+ vec_tor.set(4, "50"));
// Displaying the modified vector
System.out.println("The new Vector is:" + vec_tor);
}
}
Output:
Vector: [Geeks, for, Geeks, 10, 20] The Object that is replaced is: Geeks The Object that is replaced is: 20 The new Vector is:[Geeks, for, GFG, 10, 50]
Program 2:
Java
// Java code to illustrate set()
import java.util.*;
public class VectorDemo {
public static void main(String args[])
{
// Creating an empty Vector
Vector<Integer> vec_tor = new Vector<Integer>();
// Use add() method to add elements in the vector
vec_tor.add(12);
vec_tor.add(23);
vec_tor.add(22);
vec_tor.add(10);
vec_tor.add(20);
// Displaying the Vector
System.out.println("Vector: " + vec_tor);
// Using set() method to replace 12 with 21
System.out.println("The Object that is replaced is: "
+ vec_tor.set(0, 21));
// Using set() method to replace 20 with 50
System.out.println("The Object that is replaced is: "
+ vec_tor.set(4, 50));
// Displaying the modified vector
System.out.println("The new Vector is:" + vec_tor);
}
}
Output:
Vector: [12, 23, 22, 10, 20] The Object that is replaced is: 12 The Object that is replaced is: 20 The new Vector is:[21, 23, 22, 10, 50]
Time complexity: O(n). // n is the size of the vector.
Auxiliary Space: O(n).
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