this code is from khalid mughal threads question
i m basically not able to understand what are synchronized blocks and methods...though theoratically clear but not when it comes to coding...
i would like to know what happens when the following code is run and why...
plz detail each line of code so that i m able to understand..specially the two methods....
public class myclass extends
Thread {
static Object lock1=new Object();
static Object lock2=new Object();
static volatile int i1,i2,j1,j2,k1,k2;
public void run()
{
while(true)
{
doit();
check();
}
}
void doit()
{
synchronized(lock1)
{
i1++;
}
j1++;
synchronized(lock2)
{
k1++;
k2++;
}
j2++;
synchronized(lock1)
{
i2++;
}
}
void check()
{
if(i1!=i2)
System.out.println("i");
if(j1!=j2)
System.out.println("j");
if(k1!=k2)
System.out.println("k");
}
public static void main(
String[] args)
{
new myclass().start();
new myclass().start();
}
}
