LinkedList addAll() Method in Java - GeeksforGeeks

10 Dec, 2018
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()import java.util.*;import java.util.LinkedList;import java.util.ArrayList;  public class LinkedListDemo {   public static void main(String args[]) {        // Creating an empty LinkedList      LinkedList<String> list = new LinkedList<String>();        // Use add() method to add elements in the list      list.add("Geeks");      list.add("for");      list.add("Geeks");      list.add("10");      list.add("20");              // A collection is created      Collection<String> collect = new ArrayList<String>();      collect.add("A");      collect.add("Computer");      collect.add("Portal");      collect.add("for");      collect.add("Geeks");        // Displaying the list      System.out.println("The LinkedList is: " + list);                    // Appending the collection to the list      list.addAll(collect);       // Clearing the list using clear() and displaying     System.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()import java.util.*;import java.util.LinkedList;import java.util.ArrayList;  public class LinkedListDemo {   public static void main(String args[]) {        // Creating an empty LinkedList      LinkedList<String> list = new LinkedList<String>();        // Use add() method to add elements in the list      list.add("Geeks");      list.add("for");      list.add("Geeks");      list.add("10");      list.add("20");              // Creating a Collection      Collection<String> collect = new ArrayList<String>();      collect.add("A");      collect.add("Computer");      collect.add("Portal");      collect.add("for");      collect.add("Geeks");        // Displaying the list      System.out.println("The LinkedList is: " + list);                    // Appending the collection to the list      list.addAll(1, collect);       // Clearing the list using clear() and displaying     System.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]

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()import java.util.*;import java.util.LinkedList;import java.util.ArrayList;  public class LinkedListDemo {   public static void main(String args[]) {        // Creating an empty LinkedList      LinkedList<String> list = new LinkedList<String>();        // Use add() method to add elements in the list      list.add("Geeks");      list.add("for");      list.add("Geeks");      list.add("10");      list.add("20");              // A collection is created      Collection<String> collect = new ArrayList<String>();      collect.add("A");      collect.add("Computer");      collect.add("Portal");      collect.add("for");      collect.add("Geeks");        // Displaying the list      System.out.println("The LinkedList is: " + list);                    // Appending the collection to the list      list.addAll(collect);       // Clearing the list using clear() and displaying     System.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]

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()import java.util.*;import java.util.LinkedList;import java.util.ArrayList;  public class LinkedListDemo {   public static void main(String args[]) {        // Creating an empty LinkedList      LinkedList<String> list = new LinkedList<String>();        // Use add() method to add elements in the list      list.add("Geeks");      list.add("for");      list.add("Geeks");      list.add("10");      list.add("20");              // A collection is created      Collection<String> collect = new ArrayList<String>();      collect.add("A");      collect.add("Computer");      collect.add("Portal");      collect.add("for");      collect.add("Geeks");        // Displaying the list      System.out.println("The LinkedList is: " + list);                    // Appending the collection to the list      list.addAll(collect);       // Clearing the list using clear() and displaying     System.out.println("The new linked list is: " + list);     }}
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()import java.util.*;import java.util.LinkedList;import java.util.ArrayList;  public class LinkedListDemo {   public static void main(String args[]) {        // Creating an empty LinkedList      LinkedList<String> list = new LinkedList<String>();        // Use add() method to add elements in the list      list.add("Geeks");      list.add("for");      list.add("Geeks");      list.add("10");      list.add("20");              // Creating a Collection      Collection<String> collect = new ArrayList<String>();      collect.add("A");      collect.add("Computer");      collect.add("Portal");      collect.add("for");      collect.add("Geeks");        // Displaying the list      System.out.println("The LinkedList is: " + list);                    // Appending the collection to the list      list.addAll(1, collect);       // Clearing the list using clear() and displaying     System.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]

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()import java.util.*;import java.util.LinkedList;import java.util.ArrayList;  public class LinkedListDemo {   public static void main(String args[]) {        // Creating an empty LinkedList      LinkedList<String> list = new LinkedList<String>();        // Use add() method to add elements in the list      list.add("Geeks");      list.add("for");      list.add("Geeks");      list.add("10");      list.add("20");              // Creating a Collection      Collection<String> collect = new ArrayList<String>();      collect.add("A");      collect.add("Computer");      collect.add("Portal");      collect.add("for");      collect.add("Geeks");        // Displaying the list      System.out.println("The LinkedList is: " + list);                    // Appending the collection to the list      list.addAll(1, collect);       // Clearing the list using clear() and displaying     System.out.println("The new linked list is: " + list);     }}
The LinkedList is: [Geeks, for, Geeks, 10, 20]
The new linked list is: [Geeks, A, Computer, Portal, for, Geeks, for, Geeks, 10, 20]

Java - util package
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