The java.util.vector.copyInto() method is used to copy all of the components from this vector to another array, having enough space to hold all of the components of the vector. It is to be noted that the index of the elements remains unchanged. The elements present in the array are replaced by the elements of the vector.
Syntax:
Vector.copyInto(Object array[])
Parameters: The parameter array[] is of the type of vector. This is the array into which the elements of the vector are to be copied.
Return Value: The method is of void type and does not return any values. Exception: The method throws NullPointerException if the array is NULL. Below programs illustrates the Java.util.Vector.copyInto() method:
Program 1:
Java
// Java code to illustrate copyInto()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 into the Vector vec_tor.add("Welcome"); vec_tor.add("To"); vec_tor.add("Geeks"); vec_tor.add("4"); vec_tor.add("Geeks"); // Displaying the Vector System.out.println("Vector: " + vec_tor); // Creating an array String arr[] = new String[6]; arr[0] = "Hello"; arr[1] = "World"; // Displaying the initial array System.out.println("The initial array is: "); for (String str : arr) System.out.println(str); // Copying vec_tor.copyInto(arr); // The final array System.out.println("The final array is: "); for (String str : arr) System.out.println(str); }} |
Vector: [Welcome, To, Geeks, 4, Geeks] The initial array is: Hello World null null null null The final array is: Welcome To Geeks 4 Geeks null
Program 2:
Java
// Java code to illustrate copyInto()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 into the Vector vec_tor.add(10); vec_tor.add(20); vec_tor.add(30); vec_tor.add(40); vec_tor.add(50); // Displaying the Vector System.out.println("Vector: " + vec_tor); // Creating an array Integer arr[] = new Integer[6]; arr[0] = 50; arr[1] = 60; arr[2] = 70; arr[3] = 80; arr[4] = 90; // Displaying the initial array System.out.println("The initial array is: "); for (Integer str : arr) System.out.println(str); // Copying vec_tor.copyInto(arr); // The final array System.out.println("The final array is: "); for (Integer str : arr) System.out.println(str); }} |
Vector: [10, 20, 30, 40, 50] The initial array is: 50 60 70 80 90 null The final array is: 10 20 30 40 50 null
Time complexity: O(n), // n is the size of the array.
Auxiliary space: O(n)
