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What is the Relation between equals() and (==) Operator? (==) operator is a binary operator in java which compares the two objects based on their location in the memory. That means if two reference variables are pointing to the same object in the memory then applying (==) operator on those reference variables will return . . . Read more
Why do we have to override the equals() method in Java? We can use the equals method to check equality of two objects. The equals() method of java.lang.Object class acts the same as the == operator; that is, it tests for object identity rather than object equality. The implicit contract of the equals() method, however, is . . . Read more
What is the meaning of hashCode in Java? For every object a unique number generated by JVM which is nothing but hashCode. Hashcode won’t represent an address of the object. JVM will use hashCode while saving the object into hashing related data structures like HashTable, HashSet, HashSet, etc.. The main . . . Read more
What is Daemon thread and How to make Daemon thread? The threads which are executing in the background are called Demon threads. Ex… Garbage Collector, Signal Dispatcher, Attach Listener. The main objective of demon threads is to provide support for non-demon threads(main thread) For ex… If the main thread runs . . . Read more
Difference between yield(), join(), sleep() method? We can prevent thread execution by using the following method. yield() join() sleep() public static native void yield()Â yield() method causes to pause current executing thread to give the chance for waiting threads of the same priority. If there is no waiting thread or . . . Read more
Explain thread priority and what is default thread priority? Every thread in java has some priority. It may be default priority generated by JVM or customized priority provided by the programmer. The valid range of thread priorities is 1-10. where 1 is min priority and 10 is the max priority. . . . Read more
What is finally block in Java? It is not recommended to maintain cleanup code inside try block because there is no guarantee for the execution of every statement inside the try block. It is not recommended to maintain cleanup code inside the catch block. Because if there is no exception . . . Read more
What is the checked and unchecked exception? The exceptions which are checked by the compiler for smooth execution of the program are called checked exceptions. In our program, if there is a chance of raising checked exception then compulsory we should handle that checked exception either by try-catch or by . . . Read more
Explain Default exception handling in Java? Inside a method, if any exception occurs the method in which it is raised is responsible to create exception object by including the following information. Name of exception Description of exception Location at which exception occurs(Stack trace). After creating exception object method handover that . . . Read more
What is Volatile keyword in Java? Volatile is the modifier applies only to variables and we can’t apply anywhere else. If the value of a variable keeps on changing by multiple threads then there may be a chance of data inconsistency problem. We can solve this problem by using the . . . Read more