Java's synchronised keyword

Using the synchronised keyword in Java does not produce the desired results.

I attempted to build thread synchronisation in Java using the synchronised keyword, but I am not receiving the intended results. Variable cnt should have a final value of 20,000, however this is not the case.

package MultiThreading;


class Runner extends Thread [

private static int cnt=0;

public synchronized void func() [
cnt++;
]

public void run() [
for(int i=0; i