AbstractSet toString() method in Java with Example

Last Updated : 24 Dec, 2018
The toString() method of Java AbstractSet is used to return a string representation of the elements of the Collection. The String representation comprises a set representation of the elements of the Collection in the order they are picked by the iterator closed in square brackets[].This method is used mainly to display collections other than String type(for instance: Object, Integer)in a String Representation. Syntax: 
public String toString()
Parameter The method does not take any parameters. Return This method returns a String representation of the collection. Below examples illustrate the toString() method: Example 1: Java 
// Java program to demonstrate
// Abstract Collection toString() method

import java.util.*;

public class collection {
    public static void main(String args[])
    {
        // Creating an Empty AbstractSet
        AbstractSet<String> abs
            = new TreeSet<String>();

        // Use add() method
        // to add elements to the Collection
        abs.add("Welcome");
        abs.add("To");
        abs.add("Geeks");
        abs.add("For");
        abs.add("Geeks");

        // Using toString() method
        System.out.println(abs.toString());
    }
}
Output: 
[For, Geeks, To, Welcome]
Example 2: Java 
// Java program to demonstrate
// Abstract Collection toString() method

import java.util.*;

public class collection {
    public static void main(String args[])
    {
        // Creating an Empty AbstractSet
        AbstractSet<Integer> abs
            = new TreeSet<Integer>();

        // Use add() method
        // to add elements to the Collection
        abs.add(10);
        abs.add(20);
        abs.add(30);
        abs.add(40);

        // Using toString() method
        System.out.println(abs.toString());
    }
}
Output: 
[10, 20, 30, 40]
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