Java Questions

31. What are the different scopes for java variables? The different scopes for java variables are as follows:- Local Instance Static

21) What is the difference between instanceof() and isInstance()? instanceof() is used to see whether the object can be typecast without making use of the exception. isInstance() is to check …

11) What are the disadvantages of threads? The main disadvantage of using thread is that it is operating system dependent. It require to follow CPU cycle that various from system …

 1) What is an object? An object is an entity, which consist of attributes, behaviors and qualities that describe the object.

41. What is the Collections API? The Collections API is a set of classes and interfaces that support operations on collections of objects. One example of class in Collections API …

31. What are the three types of priority? MAX_PRIORITY which is 10, MIN_PRIORITY which is 1, NORM_PRIORITY which is 5.

21. What is the difference between an array and a vector? Number of elements in an array are fixed at the construction time, whereas the number of elements in vector …

11. What are the access modifiers in Java? There are 3 access modifiers. Public, protected and private, and the default one if no identifier is specified is called friendly, but …

1. What is a class? A class is a blueprint, or prototype, that defines the variables and the methods common to all objects of a certain kind.