Discussion
Sample37 is run - what will be the output?
public class Sample37
{
static class Nested
{
synchronized void outer() { System.out.print("outer "); inner(); }
synchronized void inner() { System.out.print("inner"); }
}
public static void main(String[] args) throws InterruptedException
{
Thread t = new Thread(() -> new Nested().outer());
t.start();
t.join();
}
}
Answer: A
Java monitors are reentrant, so a thread already holding an object's lock may enter another synchronized method on it; the entry count simply increases. Without that, any such call, including one to a superclass method, would deadlock immediately.
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