List the features of the Java Programming language?
A few of the significant features of Java Programming Language are:
Easy: Java is a language that is considered easy to learn. One fundamental concept of OOP Java has a catch to understand.
Secured Feature: Java has a secured feature that helps develop a virus-free and tamper-free system for the users.
OOP: OOP stands for Object-Oriented Programming language. OOP signifies that, in Java, everything is considered an object.
What is a ClassLoader?
A classloader in Java is a subsystem of Java Virtual Machine, dedicated to loading class files when a program is executed; ClassLoader is the first to load the executable file.
What are the Memory Allocations available in JavaJava?
Java has five significant types of memory allocations.
- Class Memory
- Heap Memory
- Stack Memory
- Program Counter-Memory
- Native Method Stack Memory
Will the program run if we write static public void main?
Yes, the program will successfully execute if written so. Because, in Java, there is no specific rule for the order of specifiers
What is the default value stored in Local Variables?
Neither the Local Variables nor any primitives and Object references have any default value stored in them.
Define Copy Constructor in Java
A Copy Constructor in Java is a constructor that initializes an object through another object of the same class.
What is a Marker Interface?
An empty interface in Java is referred to as a Marker interface. Serializable and Cloneable are some famous examples of Marker Interface.
What is Object Cloning?
An ability to recreate an object entirely similar to an existing object is known as Object Cloning in Java. Java provides a clone() method to clone a current object offering the same functionality as the original object.
Can Java be said to be the complete object-oriented programming language
No, Java cannot be treated as a complete object-oriented programming language.
Define Wrapper Classes in Java.
In Java, when you declare primitive datatypes, then Wrapper classes are responsible for converting them into objects(Reference types).
Differentiate between instance and local variables.
For instance, variables are declared inside a class, and the scope of variables in javascript is limited to only a specific object.
A local variable can be anywhere inside a method or a specific block of code. Also, the scope is limited to the code segment where the variable is declared.
What is an Exception?
An Exception handling in Java is considered an unexpected event that can disrupt the program's normal flow. These events can be fixed through the process of Exception Handling.
What is the final keyword in Java?
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.
What are the differences between constructor and method of a class in Java?
Initializing the state of the object is done by constructors. A function Object () { [native code] }, like methods, contains a group of statements (or instructions) that are carried out when an object is created. A method is a group of statements that work together to complete a certain task and return the outcome to the caller. A method has the option of working without returning anything.
Can you call a constructor of a class inside another constructor?
Yes, a class may include any number of constructors, and each function Object ()
Why is it said that the length() method of String class doesn't return accurate results?
Since this char [] array is used by the Java String class internally, the length variable cannot be made public.
What are the different categories of Java Design patterns?
The three categories of Java design patterns are creational, structural, and behavioural design patterns.
