Which is true is a(), b() & c() can be called at any time 1> i.v is guaranteed always to be 0 or 1 2> j.v is guaranteed always to be 0 or 1 3> k.v is guaranteed always to be 0 or 1 4> j.v will always be >= k.v at any given time 5> k.v will always be >= j.v at any given time I felt a,b,& c are all true as all methods are synchronized and hence when the thread is in a() only i is inc & dec so j & k remain unchanged similarly b() & c(). But the answer given is only a & b. Can someone please explain how this works?
class Counter{ int v = 0; synchronized void inc() {v++;} synchronized void dec() {v--;} } public class test extends Thread{ Counter i; Counter j; Counter k; public synchronized void a(){ i.inc(); System.out.println("a"); i.dec(); }
public synchronized void b(){ i.inc(); j.inc(); k.inc(); System.out.println("b"); i.dec(); j.dec(); k.dec(); } public synchronized void c(){ k.inc(); System.out.println("c"); k.dec(); } } Thanks V Iyer
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