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GeezerVison is showing github.com — Java/DataStructures/Queues/GenericArrayListQueue.java at master · netsparks/Java Expand file tree/ Copy pathGenericArrayListQueue.javaMore file actions 42 lines (36 loc) · 1.13 KB / Copy pathGenericArrayListQueue.javaFile metadata and controls42 lines (36 loc) · 1.13 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 import java.util.ArrayList; public class GenericArrayListQueue<T> { ArrayList<T> _queue = new ArrayList<T>(); private boolean hasElements() { return !_queue.isEmpty(); } public T peek() { T result = null; if(this.hasElements()) { result = _queue.get(0); } return result; } public boolean add(T element) { return _queue.add(element); } public T poll() { T result = null; if(this.hasElements()) { result = _queue.remove(0); } return result; } public static void main(String[] args) { GenericArrayListQueue<Integer> queue = new GenericArrayListQueue<Integer>(); System.out.println("Running..."); assert queue.peek() == null; assert queue.poll() == null; assert queue.add(1) == true; assert queue.peek() == 1; assert queue.add(2) == true; assert queue.peek() == 1; assert queue.poll() == 1; assert queue.peek() == 2; assert queue.poll() == 2; assert queue.peek() == null; assert queue.poll() == null; System.out.println("Finished."); } } |
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