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Bsc 1st Year Java Important Questions 2024
What is Java? Why is Java a platform-independent language?
Java is a high-level, class-based, object-oriented programming language designed to have as few implementation dependencies as possible. It is platform-independent because of its ability to run on any device that has the Java Virtual Machine (JVM) installed.
List the features of the Java Programming language.
Java is known for its simplicity, object-oriented nature, portability, platform independence, security, robustness, multithreading, and high performance.
What do you get in the Java download file? How do they differ from one another?
The Java download file typically includes the Java Runtime Environment (JRE) and the Java Development Kit (JDK). The JRE is used to run Java applications, while the JDK is used to develop them.
What is a ClassLoader?
A ClassLoader in Java is a part of the Java Runtime Environment that dynamically loads Java classes into the Java Virtual Machine.
What are the Memory Allocations available in Java?
Java memory allocation includes Stack Memory and Heap Memory. Stack Memory is used for static memory allocation, and Heap Memory is used for dynamic memory allocation.
What are the differences between Heap and Stack Memory in Java?
Stack Memory is used for static memory allocation and method execution, while Heap Memory is used for dynamic memory allocation of Java objects and JRE classes.
Will the program run if we write static public void main?
Yes, the program will run if we write static public void main instead of public static void main because the order of specifiers does not matter in Java.
What is the default value stored in Local Variables?
Local variables in Java do not have a default value and must be initialized before use.
Explain the expected output of the following code segment.
This question typically involves analyzing a given code segment to predict its output.
What is an Association?
Association in Java is a relationship between two separate classes that are established through their objects.
What do you mean by aggregation?
Aggregation is a special form of association where one class is a part of another class. It represents a “has-a” relationship.
Define Copy Constructor in Java.
A Copy Constructor in Java is a constructor that initializes an object using another object of the same class.
What is a Marker Interface?
A Marker Interface in Java is an interface with no methods or fields. It is used to signal to the JVM or compiler that the objects of the implementing class have some special behavior.
What is Object Cloning?
Object Cloning in Java is the process of creating an exact copy of an object.
Can Java be said to be the complete object-oriented programming language?
Java is not considered a complete object-oriented programming language because it uses primitive data types, which are not objects.
What is an object-oriented paradigm?
The object-oriented paradigm is a programming model organized around objects rather than actions and data rather than logic.
Define Wrapper Classes in Java.
Wrapper Classes in Java are classes that provide a way to use primitive data types (int, char, etc.) as objects.
What is a singleton class in Java? And How to implement a singleton class?
A singleton class in Java is a class that can have only one object (an instance of the class) at a time. It is implemented by making the constructor private and providing a static method that returns the instance of the class.
Define package in Java.
A package in Java is a namespace that organizes a set of related classes and interfaces.
Can you implement pointers in a Java Program?
No, Java does not support pointers as they are used in C/C++ because pointers can lead to unsafe code.
Differentiate between instance and local variables.
Instance variables are declared in a class but outside a method, constructor, or block, and they are created when an object is created. Local variables are declared inside a method, constructor, or block and are created when the method, constructor, or block is entered.
Explain Java String Pool.
Java String Pool is a special memory region where Java stores string literals. When a new string is created, the JVM checks the pool first. If the string already exists, the reference to the pooled instance is returned.
What is an Exception?
An Exception in Java is an event that disrupts the normal flow of the program’s instructions.
What is the final keyword in Java?
The final keyword in Java is used to declare constants, prevent method overriding, and prevent inheritance.
What happens when the main() isn’t declared as static?
If the main() method is not declared as static, the program will compile but not run because the JVM cannot invoke the main() method without creating an instance of the class.
Why is the main method static in Java?
The main method is static in Java so that it can be called without creating an instance of the class, which is necessary for the JVM to start the program.
What part of memory – Stack or Heap – is cleaned in the garbage collection process?
The Heap memory is cleaned in the garbage collection process.
What are the differences between constructor and method of a class in Java?
A constructor is used to initialize an object, while a method is used to perform a specific function. Constructors do not have a return type, while methods do.
Which among String or String Buffer should be preferred when there are a lot of updates required to be done in the data?
StringBuffer should be preferred when there are a lot of updates required because it is mutable and can be modified without creating new objects.
How does an exception propagate in the code?
An exception propagates in the code by moving up the call stack until it is caught by a matching catch block or until it reaches the top of the call stack, resulting in program termination.
Also Read: 1st year computer chapter 1 important long questions
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