ConcurrentLinkedDeque offer() method in Java with Examples

AbstractCollection toString() Method in Java

Last Updated : 05 Feb, 2025

In Java, the toString() method is defined in the Object class and is inherited by all the Java classes. It is used to return a string representation of an object. The AbstractCollection class is a part of the Java Collections Framework, which overrides this method to provide a string representation of the collection.

Example 1: This example demonstrates how the toString() method of AbstractCollection returns a string representation of the collection’s elements.

Java

// Java program to demosntrates 
// how toString() method works
import java.util.*;

public class Geeks {
  
    public static void main(String[] args) {
      
        AbstractCollection<String> ac = new ArrayList<>();
        ac.add("Geeks");
        ac.add("for");
        ac.add("Geeks");

        System.out.println(ac.toString());
    }
}

Output

[Geeks, for, Geeks]

Syntax of toString() Method

public String toString()

Parameter: The method does not take any parameters.
Return Type: This method returns a string representation of the collection.

Example 2: This example demonstrates the working of toString() method.

Java

// Java program to demonstrate 
// Abstract Collection toString() method 
import java.util.*;

public class Geeks {
  
    public static void main(String[] args) {
      
        AbstractCollection<Integer> ac = new ArrayList<>();
        ac.add(10);
        ac.add(20);
        ac.add(30);
        ac.add(40);
      
        System.out.println(ac.toString());
    }
}

Output

[10, 20, 30, 40]

ConcurrentLinkedDeque offer() method in Java with Examples

A

AnmoldeepKaur

Improve

Article Tags :

Practice Tags :

Java

Similar Reads

HashSet in Java implements the Set interface of Collections Framework. It is used to store the unique elements and it doesn't maintain any specific order of elements. Can store the Null values.Uses HashMap (implementation of hash table data structure) internally.Also implements Serializable and Clon

Java HashSet add() Method

The HashSet add() method in Java is used to add a specific element to the set. This method will add the element only if the specified element is not present in the HashSet. If the element already exists, the method will not add it again. This method ensures that no duplicate elements are added to th

Java HashSet clear() Method

The clear() method of the HashSet class in Java is used to clear all the elements from the HahSet. This method makes the HashSet empty but does not delete the HashSet itself. It simply removes all elements, leaving the set ready for reuse. Syntax of HashSet clear() Methodvoid clear() Key Points: Aft

Java HashSet contains() Method

The contains() method of the HashSet class in Java is used to check if a specific element is present in the HashSet or not. So, mainly it is used to check if a set contains any particular element. [GFGTABS] Java // Java program to demonstrates the working of contains() import java.util.*; public cla

HashSet remove() Method in Java

The HashSet remove() method in Java is used to remove a specific element from the set if it is present. Note: HashSet and the remove() were introduced in JDK 1.2 as part of the Collections Framework and are not available in earlier versions of Java (JDK 1.0 and JDK 1.1). Example 1: Here, the remove(

Java HashSet iterator() Method

The HashSet iterator() method in Java is used to return an iterator that can be used to iterate over the elements in a HashSet. HashSet does not maintain any specific order of its elements, so the elements are returned in random order when iterated over. The iterator() method provides a way to trave

Java HashSet isEmpty() Method

The HashSet isEmpty() in Java is used to check if the HashSet is empty or not. Syntax of HashSet isEmpty() Methodboolean isEmpty() Return Type: This method returns "true" if the HashSet is empty, otherwise returns "false". Example: This example demonstrates how the isEmpty() method checks whether th

Java HashSet size() Method

The HashSet size() method in Java is used to get the size of the HashSet or the number of elements present in the HashSet. Syntax of HashSet size() Methodint size() Return Type: This method returns an integer value that represents the number of elements currently stored in the HashSet. Example: This

Java HashSet clone() Method

The HashSet clone() method in Java is used to return a shallow copy of the given HashSet. It just creates a copy of the set. Syntax of HashSet clone() Methodpublic Object clone() Return Type: This method returns a new HashSet object that contains the same element as the original set. Example: This e

Java AbstractSet equals() Method

The AbstractSet equals() Method in Java is used to check for equality between two sets. This method verifies whether the elements of one set are equal to the elements of another set. Syntax of AbstractSet equals() Methodpublic boolean equals(Object o) Parameter: The object "o" is to be compared for