Circular Queue

DesignCircularQueue.java

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+//Design Circular Queue
+
+    class MyCircularQueue {
+
+    private int[] data;
+    private int head;
+    private int tail;
+    private int size;
+
+    /** Initialize your data structure here. Set the size of the queue to be k. */
+    public MyCircularQueue(int k) {
+        data = new int[k];
+        head = -1;
+        tail = -1;
+        size = k;
+    }
+
+    /** Insert an element into the circular queue. Return true if the operation is successful. */
+    public boolean enQueue(int value) {
+        if (isFull() == true) {
+            return false;
+        }
+        if (isEmpty() == true) {
+            head = 0;
+        }
+        tail = (tail + 1) % size;
+        data[tail] = value;
+        return true;
+    }
+
+    /** Delete an element from the circular queue. Return true if the operation is successful. */
+    public boolean deQueue() {
+        if (isEmpty() == true) {
+            return false;
+        }
+        if (head == tail) {
+            head = -1;
+            tail = -1;
+            return true;
+        }
+        head = (head + 1) % size;
+        return true;
+    }
+
+    /** Get the front item from the queue. */
+    public int Front() {
+        if (isEmpty() == true) {
+            return -1;
+        }
+        return data[head];
+    }
+
+    /** Get the last item from the queue. */
+    public int Rear() {
+        if (isEmpty() == true) {
+            return -1;
+        }
+        return data[tail];
+    }
+
+    /** Checks whether the circular queue is empty or not. */
+    public boolean isEmpty() {
+        return head == -1;
+    }
+
+    /** Checks whether the circular queue is full or not. */
+    public boolean isFull() {
+        return ((tail + 1) % size) == head;
+    }
+}
+
+/**
+ * Your MyCircularQueue object will be instantiated and called as such:
+ * MyCircularQueue obj = new MyCircularQueue(k);
+ * boolean param_1 = obj.enQueue(value);
+ * boolean param_2 = obj.deQueue();
+ * int param_3 = obj.Front();
+ * int param_4 = obj.Rear();
+ * boolean param_5 = obj.isEmpty();
+ * boolean param_6 = obj.isFull();
+ */