2 threads a-b-a-b or b-a-b-a loop output

Code:

/** * Two threads loop print output A-b-a-b */public class Aandbfortothread {private static object o = new Object ();    private static int flag=0;    private static Boolean close=false;                Static Class A implements Runnable {@Override public void run () {synchronized (o) {                if (flag==0) {flag=1;                    } while (!close) {System.out.println ("A"); if (flag==1) {try {o.wait ();//Release Lock} catch (Inter                        Ruptedexception e) {e.printstacktrace ();                    } o.notify ();                        }else {o.notify ();                        try {o.wait ();                        } catch (Interruptedexception e) {e.printstacktrace (); }                    }                }               O.notify (); }}}} Static class B implements Runnable {@Override public void run () {if (flag==0            ) {flag=2;                    } synchronized (o) {while (!close) {System.out.println ("B");                        if (flag==1) {o.notify ();                        try {o.wait ();                        } catch (Interruptedexception e) {e.printstacktrace ();                        }}else{try {o.wait ();//Release lock                        } catch (Interruptedexception e) {e.printstacktrace ();                    } o.notify ();            }} o.notify (); }}} public static void Main (string[] args) {Thread A = new Thread (NEW A ());        Thread B = new Thread (new B ());        B.start ();        A.start ();        try {thread.sleep (10l);        } catch (Interruptedexception e) {e.printstacktrace ();        } close=true;        A.interrupt ();    B.interrupt (); }}

Output:

2 threads a-b-a-b or b-a-b-a loop output