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Advance Java Tutorial Interview Questions

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Advance Java Tutorial Interview Questions

Java is called platform independent because of its byte codes which can run on any system irrespective of its underlying operating system.

In Java, constructor refers to a block of code which is used to initialize an object. It must have the same name as that of the class. Also, it has no return type and it is automatically called when an object is created.

There are two types of constructors:

  1. Default Constructor:In Java, a default constructor is the one which does not take any inputs. In other words, default constructors are the no argument constructors which will be created by default in case you no other constructor is defined by the user. Its main purpose is to initialize the instance variables with the default values. Also, it is majorly used for object creation. 
  2. Parameterized Constructor: The parameterized constructor in Java, is the constructor which is capable of initializing the instance variables with the provided values. In other words, the constructors which take the arguments are called parameterized constructors

The core purpose of the JDBC ResultSet Interface is the representation of a row in a table. Apart from that, it can also be used to alter the cursor pointer and churn info from the database.

   Java has five significant types of memory allocations.

  • Class Memory
  • Heap Memory
  • Stack Memory
  • Program Counter-Memory
  • Native Method Stack Memory

Java is not considered as a 100% object- oriented programming language because it still makes use of eight or more primitive data types like int, float double, etc.

In Java, when you declare primitive datatypes, then Wrapper classes are responsible for converting them into objects(Reference types). 

The term final is a predefined word in Java that is used while declaring values to variables. When a value is declared using the final keyword, then the variable’s value remains constant throughout the program’s execution.

Binding is a process of unifying the method call with the method’s code segment. Late binding happens when the method’s code segment is unknown until it is called during the runtime. 

Give a briefing on the life cycle of a thread.

The life cycle of a thread includes five stages, as mentioned below.

  1. New Born State
  2. Runnable State
  3. Running State
  4. Blocked State
  5. Dead State

The Daemon thread can be defined as a thread with the least priority. This Daemon thread is designed to run in the background during the Garbage Collection in Java.

The setDaemon() method creates a Daemon thread in Java.

  • The main objective of this process is to free up the memory space occupied by the unnecessary and unreachable objects during the Java program execution by deleting those unreachable objects.
  • This ensures that the memory resource is used efficiently, but it provides no guarantee that there would be sufficient memory for the program execution

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