NavigableSet iterator() method in Java

The iterator() method of NavigableSet interface in Java is used to return an iterator over the elements in this set, in ascending order. This iterator can be then used to iterate over the elements of the set.

Syntax:

Iterator<E> iterator()

Where, E is the type of elements maintained by this Set container.

Parameters: This function does not accepts any parameter.

Return Value: It returns an iterator over the set of elements contained in this set container.

Below programs illustrate the iterator() method in Java:

Program 1: NavigableSet with integer elements.

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// A Java program to demonstrate iterator()
// method of NavigableSet
import java.util.NavigableSet;
import java.util.TreeSet;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
        NavigableSet<Integer> ns = new TreeSet<>();
        ns.add(0);
        ns.add(1);
        ns.add(2);
        ns.add(3);
        ns.add(4);
        ns.add(5);
        ns.add(6);
  
        Iterator<Integer> itr = ns.iterator();
  
        // Iterate over the elements using itr
        while (itr.hasNext()) {
            System.out.println("Value: " + itr.next() + " ");
        }
    }
}

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Output:

Value: 0 
Value: 1 
Value: 2 
Value: 3 
Value: 4 
Value: 5 
Value: 6

Program 2: NavigableSet with string elements.

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// A Java program to illustrate iterator()
// method of NavigableSet
import java.util.NavigableSet;
import java.util.TreeSet;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
    {
        NavigableSet<String> ns = new TreeSet<>();
        ns.add("A");
        ns.add("B");
        ns.add("C");
        ns.add("D");
        ns.add("E");
        ns.add("F");
        ns.add("G");
  
        Iterator<String> itr = ns.iterator();
  
        // Iterate over the elements using itr
        while (itr.hasNext()) {
            System.out.println("Value: " + itr.next() + " ");
        }
    }
}

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Output:

Value: A 
Value: B 
Value: C 
Value: D 
Value: E 
Value: F 
Value: G

Reference: https://docs.oracle.com/javase/10/docs/api/java/util/NavigableSet.html#iterator()



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