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Commit 01fdb1f

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author
Rajeev Kumar Singh
committed
Stack Queue Iteration Examples
1 parent 82d6fd2 commit 01fdb1f

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import java.util.Iterator;
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import java.util.LinkedList;
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import java.util.Queue;
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public class IterateOverQueueExample {
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public static void main(String[] args) {
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Queue<String> waitingQueue = new LinkedList<>();
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waitingQueue.add("John");
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waitingQueue.add("Brad");
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waitingQueue.add("Angelina");
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waitingQueue.add("Julia");
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System.out.println("=== Iterating over a Queue using Java 8 forEach() ===");
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waitingQueue.forEach(name -> {
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System.out.println(name);
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});
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System.out.println("\n=== Iterating over a Queue using iterator() ===");
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Iterator<String> waitingQueueIterator = waitingQueue.iterator();
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while (waitingQueueIterator.hasNext()) {
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String name = waitingQueueIterator.next();
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System.out.println(name);
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}
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System.out.println("\n=== Iterating over a Queue using iterator() and Java 8 forEachRemaining() ===");
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waitingQueueIterator = waitingQueue.iterator();
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waitingQueueIterator.forEachRemaining(name -> {
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System.out.println(name);
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});
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System.out.println("\n=== Iterating over a Queue using simple for-each loop ===");
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for(String name: waitingQueue) {
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System.out.println(name);
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}
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}
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}
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import java.util.Iterator;
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import java.util.ListIterator;
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import java.util.Stack;
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public class IterateOverStackExample {
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public static void main(String[] args) {
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Stack<String> stackOfPlates = new Stack<>();
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stackOfPlates.add("Plate 1");
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stackOfPlates.add("Plate 2");
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stackOfPlates.add("Plate 3");
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stackOfPlates.add("Plate 4");
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System.out.println("=== Iterate over a Stack using Java 8 forEach() method ===");
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stackOfPlates.forEach(plate -> {
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System.out.println(plate);
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});
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System.out.println("\n=== Iterate over a Stack using iterator() ===");
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Iterator<String> platesIterator = stackOfPlates.iterator();
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while (platesIterator.hasNext()) {
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String plate = platesIterator.next();
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System.out.println(plate);
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}
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System.out.println("\n=== Iterate over a Stack using iterator() and Java 8 forEachRemaining() method ===");
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platesIterator = stackOfPlates.iterator();
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while (platesIterator.hasNext()) {
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String plate = platesIterator.next();
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System.out.println(plate);
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}
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System.out.println("\n=== Iterate over a Stack from TOP to BOTTOM using listIterator() ===");
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// ListIterator allows you to traverse in both forward and backward directions.
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// We'll start from the top of the stack and traverse backwards.
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ListIterator<String> platesListIterator = stackOfPlates.listIterator(stackOfPlates.size());
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while (platesListIterator.hasPrevious()) {
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String plate = platesListIterator.previous();
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System.out.println(plate);
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}
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}
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}

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