Vector addAll() Method in Java
java.util.Vector.addAll(Collection C): This method is used to append all of the elements from the collection passed as a parameter to this function to the end of a vector keeping in mind the order of return by the collection’s iterator.
Syntax:
boolean addAll(Collection C)
Parameters: The method accepts a mandatory parameter C which is a collection of ArrayList. It is the collection whose elements are needed to be appended at the end of the vector.
Return Value: The method returns True if at least one action of append is performed, else False.
Below program illustrate the Java.util.Vector.addAll() method:
Java
// Java code to illustrate boolean addAll() import java.util.*; import java.util.ArrayList; public class GFG { public static void main(String args[]) { // Creating an empty Vector Vector<String> vt = new Vector<String>(); // Use add() method to add elements in the Vector vt.add("Geeks"); vt.add(" for "); vt.add("Geeks"); vt.add(" 10 "); vt.add(" 20 "); // A collection is created Collection<String> c = new ArrayList<String>(); c.add("A"); c.add("Computer"); c.add("Portal"); c.add(" for "); c.add("Geeks"); // Displaying the Vector System.out.println("The Vector is: " + vt); // Appending the collection to the vector vt.addAll(c); // Clearing the vector using clear() and displaying System.out.println("The new vector is: " + vt); } } |
The Vector is: [Geeks, for, Geeks, 10, 20] The new vector is: [Geeks, for, Geeks, 10, 20, A, Computer, Portal, for, Geeks]
Time complexity: O(n + m). // O(n) is the number of elements in the vector and O(m) is for the collection of elements.
Auxiliary Space: O(n+m).
java.util.Vector.addAll(int index, Collection C): This method is used to append all of the elements from the collection passed as a parameter to this function at a specific index or position of a vector.
Syntax:
boolean addAll(int index, Collection C)
- Parameters: This function accepts two parameters as shown in the above syntax and are described below.
- index: This parameter is of integer datatype and specifies the position in the vector starting from where the elements from the container will be inserted.
- C: It is a collection of ArrayList. It is the collection whose elements are needed to be appended.
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