- java.util.LinkedList.addAll(Collection C): This method is used to append all of the elements from the collection passed as parameter to this function to the end of a list keeping in mind the order of return by the collections iterator.
Syntax:
boolean addAll(Collection C)
Parameters: The parameter C is a collection of ArrayList. It is the collection whose elements are needed to be appended at the end of the list.
Return Value: The method returns true if at least one action of append is performed.
Below program illustrate the Java.util.LinkedList.addAll() method:
// Java code to illustrate boolean addAll()importjava.util.*;importjava.util.LinkedList;importjava.util.ArrayList;publicclassLinkedListDemo {publicstaticvoidmain(String args[]) {// Creating an empty LinkedListLinkedList<String> list =newLinkedList<String>();// Use add() method to add elements in the listlist.add("Geeks");list.add("for");list.add("Geeks");list.add("10");list.add("20");// A collection is createdCollection<String> collect =newArrayList<String>();collect.add("A");collect.add("Computer");collect.add("Portal");collect.add("for");collect.add("Geeks");// Displaying the listSystem.out.println("The LinkedList is: "+ list);// Appending the collection to the listlist.addAll(collect);// Clearing the list using clear() and displayingSystem.out.println("The new linked list is: "+ list);}}Output:The LinkedList is: [Geeks, for, Geeks, 10, 20] The new linked list is: [Geeks, for, Geeks, 10, 20, A, Computer, Portal, for, Geeks]
- java.util.LinkedList.addAll(int index, Collection C): This method is used to append all of the elements from the collection passed as parameter to this function at a specific index or position of a list.
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 list 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.
Return Value: The method returns TRUE if at least one action of append is performed.
Below program illustrate the Java.util.LinkedList.addAll() method:
// Java code to illustrate boolean addAll()importjava.util.*;importjava.util.LinkedList;importjava.util.ArrayList;publicclassLinkedListDemo {publicstaticvoidmain(String args[]) {// Creating an empty LinkedListLinkedList<String> list =newLinkedList<String>();// Use add() method to add elements in the listlist.add("Geeks");list.add("for");list.add("Geeks");list.add("10");list.add("20");// Creating a CollectionCollection<String> collect =newArrayList<String>();collect.add("A");collect.add("Computer");collect.add("Portal");collect.add("for");collect.add("Geeks");// Displaying the listSystem.out.println("The LinkedList is: "+ list);// Appending the collection to the listlist.addAll(1, collect);// Clearing the list using clear() and displayingSystem.out.println("The new linked list is: "+ list);}}Output:The LinkedList is: [Geeks, for, Geeks, 10, 20] The new linked list is: [Geeks, A, Computer, Portal, for, Geeks, for, Geeks, 10, 20]
LinkedList addAll() Method in Java
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