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Usually asked only to fresh graduates and less experienced developers.
  Q31. What is a daemon thread? Give an Example ?
Ans. These are threads that normally run at a low priority and provide a basic service to a program or programs when activity on a machine is reduced. garbage collector thread is daemon thread.

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   Like         Discuss         Correct / Improve     java   threads   multi threading   operating system   daemon thread   garbage collection     Asked in 10 Companies      intermediate        frequent

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 Q32. What is race condition ?Operating System
Ans. A source of possible errors in parallel programming, where one thread can cause an error in another thread by changing some aspect of the state of the program that the second thread is depending on (such as the value of variable).

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   Like         Discuss         Correct / Improve     java.threads   multithreading   race condition   parallel programming   synchronization   ebay   concurrency     Asked in 10 Companies


 Q33. Difference between PATH and CLASSPATH ?Operating System
Ans. PATH is the variable that holds the directories for the OS to look for executables. CLASSPATH is the variable that holds the directories for JVM to look for .class files ( Byte Code ).

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 Q34. Should we create system software ( e.g Operating system ) in Java ?Core Java
Ans. No, Java runs on a virtual machine called JVM and hence doesn't embed well with the underlying hardware. Though we can create a platform independent system software but that would be really slow and that's what we would never need.

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   Like         Discuss         Correct / Improve     java   system software java   jvm   yes-no   yes no   java operating system   architecture


 Q35. Semaphores are used to solve problem of ... Operating system
a. Race Condition
b. Process Synchronization
c. Mutual Exclusion
d. All of above

Ans.d. All of above

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