Java Collections addAll() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collections addAll() Method

The addAll() is a method of Java Collections class which adds all of the specified elements to the specified collection. The elements to be added may be specified individually or as an array.

Syntax

Following is the declaration of addAll() method:

Parameter

Parameter	Description	Required/Optional
c	It is a collections into which elements are to be inserted.	Required
elements	Elements are the elements to be inserted into c.	Required

Returns

The addAll() method returns true if the collection changed as a result of the method call.

Exceptions

UnsupportedOperationException– If collection c does not support the add operation.

NullPointerException– If elements contain null values and c does not permit null elements, or if c or elements are null.

IllegalArgumentException– If some properties of a value in elements prevent it from being added to c.

Compatibility Version

Java 1.5 and above

Example 1

  import java.util.Collections;  import java.util.HashSet;  import java.util.Set;  public class CollectionsAddAllExample1 {  public static void main(String[] args) {  Set set = new HashSet<>();              boolean b = Collections.addAll(set, 1, 2, 3, 4, 5);              System.out.println(“Boolean Result: “+b);              System.out.println(“Collection Value: “+set);        }  }  

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Output:

Boolean Result: true  Collection Value: [1, 2, 3, 4, 5]

Example 2

  import java.util.*;  public class CollectionsAddAllExample2 {  public static void main(String[] args) {  List alist = new ArrayList();  alist.add(“Rahul”);  alist.add(“Karthik”);  alist.add(“OM”);  alist.add(“Shiva”);  alist.add(“Anand”);  alist.add(“Prem”);  System.out.println(“The List are: “+alist);  boolean b = Collections.addAll(alist, “Rahul”, “OM”, “Prem”);  System.out.println(“Boolean Result: “+b);  System.out.println(“Collection Value: “+alist);      }  }  

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Output:

The List are: [Rahul, Karthik, OM, Shiva, Anand, Prem]  Boolean Result: true  Collection Value: [Rahul, Karthik, OM, Shiva, Anand, Prem, Rahul, OM, Prem]

Example 3

  import java.util.*;  public class CollectionsAddAllExample3 {  public static void main(String[] args) {  //Create object of an array list                List alist = new ArrayList();        //Add values to the list        alist.add(“TutorAspire”);        alist.add(“SSSIT.COM”);        alist.add(“Hindi100.COM”);          System.out.println(“Initial collection value: “+alist);        //Add values to this collection and print Final collection Result        boolean b = Collections.addAll(alist, “Rank1″,”Rank2″,”Rank3”);        System.out.println(“Boolean Result: “+b);        System.out.println(“Final collection value: “+alist);      }  }  

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Output:

Initial collection value: [TutorAspire, SSSIT.COM, Hindi100.COM]  Boolean Result: true  Final collection value: [TutorAspire, SSSIT.COM, Hindi100.COM, Rank1, Rank2, Rank3]

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Java Collections addAll() Method with Examples

Java Collections addAll() Method

Syntax

Parameter

Returns

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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