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Java question

 
Java ques interview


Ques:-List any five features of Java?
 Ans :-Some features include Object Oriented, Platform Independent, Robust, Interpreted, Multi-threaded
Ques . write full form of jdbc & odbc ?
 Ans :-  JDBC -java database connectivity.
            ODBC - open database connectivity

 Ques:- what are types of packages ?
Ans: 1. Pre-defined packages 2. User defined packages

 Ques :-Define class?
 Ans:- A class is a blue print from which individual objects are created. A class can contain fields and methods to describe the behavior of an object.

 Ques:- Denfie string bulider?
Ans :- Use StringBuilder whenever possible because it is faster than StringBuffer. But, if thread safety is necessary then use StringBuffer objects.

 Ques :- What is Singleton class?
 Ans:Singleton class control object creation, limiting the number to one but allowing the flexibility to create more objects if the situation changes.

  Ques :-When super keyword is used?
Ans : If the method overrides one of its superclass's methods, overridden method can be invoked through the use of the keyword super. It can be also used to refer to a hidden field.


Ques :Define immutable object?
Ans :An immutable object can’t be changed once it is created.

 Ques :-Explain the usage of this() with constructors?
 Ans "It is used with variables or methods and used to call constructer of same class.

 Ques :-What is JIT compiler?
 Ans :Just-In-Time(JIT) compiler:It is used to improve the performance. JIT compiles parts of the byte code that have similar functionality at the same time, and hence reduces the amount of time needed for compilation.Here the term “compiler” refers to a translator from the instruction set of a Java virtual machine (JVM) to the instruction set of a specific CPU.

 Ques :- What is class laoder?
Ans : The class loader is a subsystem of JVM  that is used for load classes and interface.

Ques : What are the important features of Java 8 release?
Ans : Java 8 has been released in March 2014, so it’s one of the hot topic in java interview questions.    Java 8 has been one of the biggest release after Java 5 annotations and generics.

Ques : Can we constructor inherited?

  Ans :-No

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