What are the different Java interview questions you need to know?
1) What is the number of memory types allocated by JVM? Many types: 1. Stack 2. Heap 3. Native Method Stack 4. Program Counter Register 5. Class(Method) Area 2) What is platform?
A system is generally the components or application atmosphere in which a program operates. There are two types of system software-based and hardware-based Java provides softwarebased system.
3) What gives Java its 'write once and run anywhere' nature? The bytecode Java is collected to be a byte program code which is the advanced language between source program code and device program code. This byte program code is not system particular and hence can be fed to any system.
5) What is classloader? The classloader is a subsystem of JVM that is used to fill sessions and connections.There are various kinds of classloaders e.g. Bootstrap classloader, Expansion classloader, Program classloader, Plug-in classloader etc. 6) What is the distinction between
7) Is next, delete, exit, main or null keyword in Java? No. 8) Will the String array of Main method is empty or null; if any arguments are not provided on the command line? It is empty, but not null.
11) Does constructor come back any value? yes, that is present example (You cannot use return type yet it gives a value). 12) Is constructor inherited? No, constructor is not inherited
15) Why main method is static? As it is not required for the object to instantiate a static method and if it was non static method, object is first created by jvm and then it calls the main function and it will lead to the problem of extra allocation of memory. 16) What is static block?