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.
- index: This is of integer type and refers to the position of the element that is to be replaced from the vector.
- element: It is the new element by which the existing element will be replaced and is of the same object type as the vector.
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).