Java J2ee Planet

What are three ways in which a thread can enter the waiting state? Or What are different ways in which a thread can enter the waiting state? A thread can enter the waiting state by the following ways: 1. Invoking its sleep() method, 2. By blocking on I/O 3. By unsuccessfully attempting to acquire an object's lock 4. By invoking an object's wait() method. 5. It can also enter the waiting state by invoking its (deprecated) suspend() method. What is the difference between yielding and sleeping? When a task invokes its yield() method, it returns to the ready state, either from waiting, running or after its creation. When a task invokes its sleep() method, it returns to the waiting state from a running state. How to create multithreaded program? Explain different ways of using thread? When a thread is created and started, what is its initial state? Or Extending Thread class or implementing Runnable Interface. Which is better? You have two ways to do so. First, making you...

Q1) Which part of the memory is involved in Garbage Collection? Stack or Heap? Ans) Heap Q2)What is responsiblity of Garbage Collector? Ans) Garbage collector frees the memory occupied by the unreachable objects during the java program by deleting these unreachable objects. It ensures that the available memory will be used efficiently, but does not guarantee that there will be sufficient memory for the program to run. Q3) Is garbage collector a dameon thread? Ans) Yes GC is a dameon thread. A dameon thread runs behind the application. It is started by JVM. The thread stops when all non-dameon threads stop. Q4)Garbage Collector is controlled by whom? Ans) The JVM controls the Garbage Collector; it decides when to run the Garbage Collector. JVM runs the Garbage Collector when it realizes that the memory is running low, but this behavior of jvm can not be guaranteed. One can request the Garbage Collection to happen f...