Java multithreaded synchronization--producer consumer issues

This is a model of a producer consumer problem in a Java video tutorial by a horse soldier teacher.

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2. Public class produceconsumer{
4. public static void Main (string[] args) {
6. Syncstack ss = new Syncstack ();
8. Producer Pro = new Producer (ss);
10. Consumer con = new Consumer (ss);
12. new Thread (PRO). Start ();
14. new Thread (Con). Start ();
18. }
20. }
24. Class product{
26. int id;
28. Public Product (int id) {
30. this.id = ID;
32. }
34. Public String toString () {
36. return "Product:" + ID;
38. }
40. }
44. Class syncstack{
46. int index = 0;
48. product[] Arrpro = new product[6];
52. public synchronized void push (Product p) {
54. While (index = = arrpro.length) {
56. try {
58. this.wait ();
60. } catch (Interruptedexception e) {
62. //TODO auto-generated catch block
64. E.printstacktrace ();
66. }
68. }
72. this.notify ();
74. Arrpro[index] = p;
76. index++;
78. }
82. public Synchronized Product pop () {
84. While (index = = 0) {
86. try {
88. this.wait ();
90. } catch (Interruptedexception e) {
92. //TODO auto-generated catch block
94. E.printstacktrace ();
96. }
98. }
102. this.notify ();
104. index--;
106. return Arrpro[index];
108. }
112. }
116. Class Producer implements runnable{
118. Syncstack SS = null;
120. Public Producer (Syncstack ss) { //holds a reference to Syncstack
122. THIS.SS = SS;
124. }
126. @Override
128. public Void Run () {
130. For (int i=0; i<; i++) {
132. Product P = New product (i);
134. Ss.push (P);
136. System.out.println ("produced:" + P);
138. try {
140. Thread.Sleep (100);
142. } catch (Interruptedexception e) {
144. E.printstacktrace ();
146. }
150. }
154. }
156. }
160. Class Consumer implements runnable{
164. Syncstack SS = null;
166. Public Consumer (Syncstack ss) { //holds a reference to Syncstack
168. THIS.SS = SS;
170. }
172. @Override
174. public Void Run () {
176. For (int i=0; i<; i++) {
178. Product p = ss.pop ();
180. System.out.println ("consumed:" + P);
182. try {
184. Thread.Sleep (1000);
186. } catch (Interruptedexception e) {
188. E.printstacktrace ();
190. }
194. }
198. }
200. }

Java multithreaded synchronization--producer consumer issues