Java Collection remove() Method with Examples

by Online Tutorials Library July 22, 2022

Java Collection remove() Method

The remove() method of Java Collection Interface is used to remove a single instance of the specified element from this collection.

Syntax

Parameters

The parameter ‘o’ represents the element to be removed from this collection if it is present.

Throws

ClassCastException– if the type of the specified element is not compatible with this collection

NullPointerException– if the specified element is null and this collection does not allow null elements

Returns

The remove() method returns a boolean value ‘true’ if the specified element is successfully removed as a result of this call.

Example 1

  import java.util.Collection;  import java.util.HashSet;  public class JavaCollectionRemoveExample1 {      public static void main(String[] args) {          Collection<Integer> collection = new HashSet<>();          collection.add(5);          collection.add(15);          collection.add(52);          collection.add(532);          collection.add(52);          for (Integer i:collection) {              System.out.println(i);          }         //will remove the specified element from the collection          collection.remove(52);          System.out.println(“After removing 52 nCollection : “+collection);      }  }  

Test it Now

Output:

52  532  5  15  After removing 52   Collection : [532, 5, 15]

Example 2

  import java.util.Collection;  import java.util.HashSet;  public class JavaCollectionRemoveExample2 {      public static void main(String[] args) {          Collection<String> collection = new HashSet<>();          collection.add(“Reema”);          collection.add(“Geetanajli”);          collection.add(“Mahesh”);          collection.add(“Ajeet”);            for (String i:collection) {              System.out.println(i);          }          //will remove the specified element from the collection          boolean val=collection.remove(“ABC”);          System.out.println(“Remove method will return : “+val);      }  }  

Test it Now

Output:

Reema  Geetanajli  Mahesh  Ajeet  remove method will return : false

Example 3

  import java.util.ArrayDeque;  import java.util.Collection;  public class JavaCollectionRemoveExample3 {      public static void main(String[] args) {          Collection<String> collection = new ArrayDeque<String>() {          };          collection.add(“Reema”);          collection.add(“Geetanajli”);          //pass an exception for null elements          collection.add(null);            for (String i:collection) {              System.out.println(i);          }          //will remove the specified element from the collection          boolean val=collection.remove(“ABC”);          System.out.println(“Remove method will return : “+val);      }  }  

Test it Now

Output:

Exception in thread "main" java.lang.NullPointerException  at java.util.ArrayDeque.addLast(ArrayDeque.java:249)  at java.util.ArrayDeque.add(ArrayDeque.java:423)  at com.tutorAspire.JavaCollectionRemoveExample3.main(JavaCollectionRemoveExample3.java:13)

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Java Collection remove() Method with Examples

Java Collection remove() Method

Syntax

Parameters

Throws

Returns

Example 1

Example 2

Example 3

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