AbstractCollection toString() Method in Java

Last Updated : 11 Jul, 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());
    }
}