public class Threads1{ int x = 0; public class Runner implements Runnable{ public void run(){ int current = 0; for(int i=0; i < 4; i++) { current = x; System.out.print(current + ", "); x = current + 2; } } } public static void main(String[ ] args) { new Thread1().go(); } public void go() { Runnable r1 = new Runner(); new Thread(r1).start(); new Thread(r1).start(); } }