Stack iterator() method in Java with Example

The Java.util.Stack.iterator() method is used to return an iterator of the same elements as that of the Stack. The elements are returned in random order from what was present in the stack.

Syntax:

Iterator iterate_value = Stack.iterator();

Parameters: The function does not take any parameter.

Return Value: The method iterates over the elements of the stack and returns the values(iterators).

Below program illustrates the use of Java.util.Stack.iterator() method:

Example 1:

// Java code to illustrate iterator()

import java.util.*;
import java.util.Stack;

public class StackDemo {
    public static void main(String args[])
    {
        // Creating an empty Stack
        Stack<String> stack = new Stack<String>();

        // Use add() method to add elements into the Stack
        stack.add("Welcome");
        stack.add("To");
        stack.add("Geeks");
        stack.add("4");
        stack.add("Geeks");

        // Displaying the Stack
        System.out.println("Stack: " + stack);

        // Creating an iterator
        Iterator value = stack.iterator();

        // Displaying the values
        // after iterating through the stack
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

Output:

Stack: [Welcome, To, Geeks, 4, Geeks]
The iterator values are: 
Welcome
To
Geeks
4
Geeks

Example 2:

// Java code to illustrate hashCode()

import java.util.*;

public class StackDemo {
    public static void main(String args[])
    {
        // Creating an empty Stack
        Stack<Integer> stack
            = new Stack<Integer>();

        // Use add() method
        // to add elements into the Stack
        stack.add(10);
        stack.add(20);
        stack.add(30);
        stack.add(40);
        stack.add(50);

        // Displaying the Stack
        System.out.println("Stack: " + stack);

        // Creating an iterator
        Iterator value = stack.iterator();

        // Displaying the values
        // after iterating through the stack
        System.out.println("The iterator values are: ");
        while (value.hasNext()) {
            System.out.println(value.next());
        }
    }
}

Output:

Stack: [10, 20, 30, 40, 50]
The iterator values are: 
10
20
30
40
50