From 175721a63b426355274fa9e8063f762020ab8362 Mon Sep 17 00:00:00 2001
From: RossTheRoss <mstrapp@protonmail.com>
Date: Thu, 30 Jan 2020 16:55:04 -0600
Subject: R E A R R A N G E

---
 OLD/csci1913/Java/lab11_strap012.java | 115 ++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 OLD/csci1913/Java/lab11_strap012.java

(limited to 'OLD/csci1913/Java/lab11_strap012.java')

diff --git a/OLD/csci1913/Java/lab11_strap012.java b/OLD/csci1913/Java/lab11_strap012.java
new file mode 100644
index 0000000..7eb146a
--- /dev/null
+++ b/OLD/csci1913/Java/lab11_strap012.java
@@ -0,0 +1,115 @@
+class Deque<Base> {
+    private Node head;
+    private class Node {
+        private Base object;
+        private Node left;
+        private Node right;
+        private Node(Base o, Node l, Node r) {
+            object = o;
+            left = l; right = r;
+        }
+    }
+    public Deque() {
+        head = new Node(null, null, null);
+        head.left=head; head.right=head;
+    }
+    public void enqueueRear(Base object) {
+            Node tempL = head;
+            Node newNode = new Node(object, tempL.left, tempL);
+            tempL.left.right = newNode;
+            tempL.left = newNode;
+    }
+    public void enqueueFront(Base object) {
+            Node tempR = head;
+            Node newNode = new Node(object, tempR, tempR.right);
+            tempR.right.left = newNode;
+            tempR.right = newNode;
+    }
+    public Base dequeueRear() {
+        if (isEmpty()) {
+            throw new IllegalStateException();
+        } else {
+            Node temp = head.left;
+            temp.left.right = head;
+            head.left = temp.left;
+            return temp.object;
+        }
+    }
+    public Base dequeueFront() {
+        if (isEmpty()) {
+            throw new IllegalStateException();
+        } else {
+            Node temp = head.right;
+            temp.right.left = head;
+            head.right = temp.right;
+            return temp.object;
+        }
+    }
+    public Boolean isEmpty() {
+        return head.right==head && head.left==head;
+    }
+}
+
+// OBSERVATION DEQUE. Test the class DEQUE. 40 points total.
+class ObservationDeque{
+// MAIN. Test the DEQUE on various example arguments. 
+    public static void main(String [] args) { 
+        Deque<String> deque = new Deque<String>();
+        System.out.println(deque.isEmpty()); // true 2 points. 
+        try {
+            System.out.println(deque.dequeueFront()); 
+        } catch (IllegalStateException ignore) { 
+            System.out.println("No dequeueFront."); // No dequeueFront. 2 points. 
+        } 
+        try { System.out.println(deque.dequeueRear());
+        } catch (IllegalStateException ignore) { 
+            System.out.println("No dequeueRear."); // No dequeueRear. 2 points. 
+        }
+//Enqueueing to the rear and dequeueing from the rear makes the DEQUE act
+// like a stack. 
+        deque.enqueueRear("A");
+        deque.enqueueRear("B"); 
+        deque.enqueueRear("C");
+
+        System.out.println(deque.isEmpty()); // false 2 points.
+
+        System.out.println(deque.dequeueRear()); // C 2 points.
+        System.out.println(deque.dequeueRear()); // B 2 points.
+        System.out.println(deque.dequeueRear()); // A 2 points.
+        System.out.println(deque.isEmpty()); // true 2 points.
+// Enqueueing to the rear and dequeueing from the front makes the DEQUE act
+// like a queue.
+        deque.enqueueRear("A"); 
+        deque.enqueueRear("B"); 
+        deque.enqueueRear("C");
+
+        System.out.println(deque.dequeueFront()); // A 2 points.
+        System.out.println(deque.dequeueFront()); // B 2 points.
+        System.out.println(deque.dequeueFront()); // C 2 points.
+
+        System.out.println(deque.isEmpty()); // true 2 points.
+//Enqueueing to the front and dequeueing from the front makes the DEQUE act
+//like a stack. 
+        deque.enqueueFront("A"); 
+        deque.enqueueFront("B");
+        deque.enqueueFront("C"); 
+
+        System.out.println(deque.dequeueFront()); // C 2 points.
+        System.out.println(deque.dequeueFront()); // B 2 points.
+        System.out.println(deque.dequeueFront()); // A 2 points.
+
+        System.out.println(deque.isEmpty()); // true 2 points.
+
+// Enqueueing to the front and dequeueing from the rear makes the DEQUE act
+// like a queue.
+        deque.enqueueFront("A"); 
+        deque.enqueueFront("B"); 
+        deque.enqueueFront("C");
+
+        System.out.println(deque.dequeueRear()); // A 2 points.
+        System.out.println(deque.dequeueRear()); // B 2 points.
+        System.out.println(deque.dequeueRear()); // C 2 points.
+
+        System.out.println(deque.isEmpty()); // true 2 points. 
+    }
+}
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