CORE JAVA INTERVIEW. QUESTIONS AND ANSWERS. Table of Contents. 1) what are static blocks and static initalizers in Java?. Dear readers, these Java Interview Questions have been designed especially during your interview, normally questions start with some basic concept of the subject and later they continue based on further discussion and what you answer −. Basic Java Interview Questions and Answers for Freshers or Experienced Pdf. This interview section questions contains a brief introduction to the Java.
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No class can extend the final class. Q 38 What is a Thread? Ans: In Java, the flow of a execution is called Thread.
Every java program has at least one thread called main thread, the Main thread is created by JVM. The user can define their own threads by extending Thread class or by implementing Runnable interface. Threads are executed concurrently. Ans: There are two ways available in order to make a thread. The thread is available in java. We can overload the run method in our class. For that we should provide the implementation for run method which is defined in the interface.
Ans: Join method is used to join one thread with the end of the currently running thread. When it reaches the code t. Once it reaches the code t. It is a non-static method. Join method has overloaded version. Q 41 What does yield method of the Thread class do?
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So that equal priority threads have a chance to run. It is a static method. Yield method moves the thread back to the Runnable state only, and not the thread to sleep , wait or block. Ans: wait method is used to make the thread to wait in the waiting pool.
When a wait method is executed during a thread execution then immediately the thread gives up the lock on the object and goes to the waiting pool.
Wait method tells the thread to wait for a given amount of time. Then the thread will wake up after notify or notify all method is called. Wait and the other above-mentioned methods do not give the lock on the object immediately until the currently executing thread completes the synchronized code. It is mostly used in synchronization.
Ans: Given below are few differences between notify method and notifyAll method notify notifyAll This method is used to send a signal to wake up a single thread in the waiting pool. This method sends the signal to wake up all the threads in a waiting spool.
Q 44 How to stop a thread in java? Explain about sleep method in a thread? Ans: We can stop a thread by using the following thread methods. Sleeping Blocked Sleep: Sleep method is used to sleep the currently executing thread for the given amount of time. Once the thread is wake up it can move to the runnable state. So sleep method is used to delay the execution for some period.
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Please send me the interview questions pdf ebook.Ans: Thread has the following states: New. Moreover, Java does not even support automatic pass-by-value.
Hibernate supports JPA annotations, so code is independent of implementation and easily replaceable with other ORM tools. Please send me the ebook for Java interview questions pdf. It is used to provide the runtime environment. Please send me the java interview questions and answers pdf….. Sleeping Blocked Sleep: Sleep method is used to sleep the currently executing thread for the given amount of time.
There are three types of loops in Java: 1 For Loops For loops are used in java to execute statements repeatedly for a given number of times.