Is it possible? Q33. for better understanding. Java is not so interactive with hardware. Q98. It physically exists. Give an example of use of Pointers in Java class. Q10. Q19. Is the following class declaration correct? In below example, a constant with the name const_val is declared and assigned avalue: When a method is declared as final,it can NOT be overridden by the subclasses.This method are faster than any other method,because they are resolved at complied time. How are destructors defined in Java? Give a practical example of its usage. What is ternary operator? super can be used to invoke the immediate parent class method. How can I do so? Ans: Memory isn't allocated before creation of objects. Therefore, the college name will be defined as static. Ans: In java, we can pass argument to a function only by value and not by reference. The method is not provided by the compiler in any case. Program compiles. s1 and s3 are references to same object. Collections interview questions. If an application has multiple classes in it, is it okay to have a main method in more than one class? Ans: If we want certain variables of a class not to be serialized, we can use the keyword transient while declaring them. super() can be used to invoke immediate parent class constructor. Inheritance provides code reusability. The bytecode. The primary difference between a stack and a queue is that stack is based on Last in First out (LIFO) principle while a queue is based on FIFO (First In First Out) principle. The name of the constructor must be similar to the class name. No, this cannot be assigned to any value because it always points to the current class object and this is the final reference in Java. Ans: In java, there is no way to find out the exact size of an object on the heap. In the below example, if rank is 1, status is assigned a value of "Done" else "Pending". Ans: Stack and Queue both are used as placeholder for a collection of data. Q20. Ans: main method is an entry point of Java class and is required for execution of the program however; a class gets compiled successfully even if it doesn't have a main method. Ans: Yes, a class can have multiple constructors with different parameters. Yes, we can modify the throws clause of the superclass method while overriding it in the subclass. Can we override static methods of a class? It's called only once for an object at the time of object creation and hence, we can't invoke the constructor again for an object after its creation. The purpose of the default constructor is to assign the default value to the objects. The base class can hide some data from the derived class by making it private. Ans: The primary difference between an abstract class and interface is that an interface can only possess declaration of public static methods with no concrete implementation while an abstract class can have members with any access specifiers (public, private etc) with or without concrete implementation. More Details. The method() is overloaded in class Base whereas it is derived in class Derived with the double type as the parameter. How garbage collection is done in Java? Classes implement this interface to enable multi threading. Ans: An infinite loop runs without any condition and runs infinitely. JVM is an acronym for Java Virtual Machine; it is an abstract machine which provides the runtime environment in which Java bytecode can be executed. Can we call a non-static method from inside a static method? However, we must notice that we cannot decrease the accessibility of the method.
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