public class Main {
public static void main(String[] args){
XClass x = new XClass();
ProduceX prodx = new ProduceX(x);
PrintX printx = new PrintX(x);
prodx.start();
printx.start();
}
}
class XClass {
private int x;
private boolean produced = false;
public XClass(){
this.x = 0;
}
public synchronized int modifyX(){
while(produced==true){
try{
wait();
}
catch(InterruptedException ie){}
}
x=x+1;
produced = true;
notifyAll();
return x;
}
public synchronized void printX(){
while(produced==false){
try{
wait();
}
catch(InterruptedException ie){}
}
produced = false;
System.out.println(Thread.currentThread().getName()+" prints "+x);
notifyAll();
}
}
class PrintX extends Thread{
private XClass x;
public PrintX(XClass x){
this.x = x;
}
public void printX(){
for(int i=0;i<10;i++){
x.printX();
}
}
}
class ProduceX extends Thread{
private XClass x;
public ProduceX(XClass x){
this.x = x;
}
public void run(){
for(int i=0;i<10;i++){
x.modifyX();
System.out.println(Thread.currentThread().getName()+" increases x to "+ x.modifyX());
}
}
}
The problem is similar to producer consumer. Here producex will increase x by 1, and will increase again until x is printed by printx. But, seems no result. Where is the bug?
