Thread code produces different output

[naveen yadav]

Following Code 1 and Code2 is expected to produce same output. Code 1 works as expected but code 2 does not.

Why Code 2 produces "11" every time.


Code 1

public class Pregnant extends Thread {
 int x = 0;
 public static void main(String[] args) {
 Runnable r1 = new Pregnant();
 new Thread(r1).start();
new Thread(r1).start();
}
public void run() {
 for(int j = 0; j < 3; j++) {
 x = x + 1;
x = x + 10;
 System.out.println(Thread.currentThread().getName() +": " +x );
 x = x + 100;
 } } }
 

Output values :
11
22
133
244
466
355






Code 2

public class Skip {
 
 public static void main(String[] args) throws Exception {
 
 Jump ob = new Jump();
 Thread t1 = new Thread(ob);
 Thread t2 = new Thread(ob);
 t1.start(); 
 t2.start();
 } }
 class Jump implements Runnable {
 
int ctr=0;
 
public void run() {

 for(int i = 0; i < 3; i++) {
ctr = ctr=+1;
ctr = ctr+10;
System.out.println(Thread.currentThread().getName() + "ctr ="+ctr);
ctr = ctr+100; 
 } } }

Output values : 11 six times . Why ?

[Tim Moores]

The problem is in line 18 of class Skip.

[naveen yadav]

yes it typing mistake. otherwise Both codes woks exactly same as expected.

thanks Tim

[O. Ziggy]

What was the mistake? i cant see it..