Producer Consumer (Threads)

Question

I had written the following program pasted below . When I try to execute this program I get the error as Canot Resolve Symbol
symbol : constructor Consumer(ProducerConsumer)
location: class Consumer
Consumer c = new Consumer(pc);
^
Similarly for Producer.
I want everything in one class so i am using the dataobject in the mainclass itself and then passing that object to the 2 thread constructors so that they can in their run method call the get and put methods which are basicaly synchronised
Please help me as to where am i going wrong...
import java.lang.Thread;
import java.io.*;
class Producer extends Thread{
private ProducerConsumer dob;
public void Producer(ProducerConsumer c){
dob = c;
public void run(){
for (int i=1;i<10;i++){
dob.put(i);
System.out.println("The value put by thread " + this.getName() + "is" + i);
class Consumer extends Thread{
private ProducerConsumer dob;
public void Consumer(ProducerConsumer c){
dob = c;
public void run(){
for (int i=1;i<10;i++){
int result = dob.get();
System.out.println("The value got by thread"+ this.getName() + "is ");
//dicy exit
System.exit(0);
public class ProducerConsumer extends Thread{
public static void main(String[] args){
ProducerConsumer pc = new ProducerConsumer();
Consumer c = new Consumer(pc);
c.start();
Producer p = new Producer(pc);
p.start();
private int value;
private boolean flag;
public synchronized int get(){
while (flag == false){
try {
wait();
System.out.println("Consumer is waiting");
catch (InterruptedException e) {}
flag = false;
notifyAll();
return this.value;
public synchronized void put(int value){
while (flag == true){
try {
wait();
System.out.println("Producer is waiting");
catch (InterruptedException e) {}
flag = true;
this.value = value;
notifyAll();
}

Answer 1

public void Consumer(ProducerConsumer c){Constructors are methods that do not have a return type. So change the line above to
public Consumer(ProducerConsumer c){
public class PC{
    private int value;
    private boolean flag;
    public synchronized int get(){
        while (flag == false){
            try {
                wait();
                System.out.println("Consumer is waiting");
            } catch (InterruptedException e) {
        flag = false;
        notifyAll();
        return this.value;
    public synchronized void put(int value){
        while (flag == true){
            try {
                wait();
                System.out.println("Producer is waiting");
            } catch (InterruptedException e) {
        flag = true;
        this.value = value;
        notifyAll();
    public static void main(String[] args){
        PC pc = new PC();
        Consumer c = new Consumer(pc);
        c.start();
        Producer p = new Producer(pc);
        p.start();
}