Java Fundamentals

Ques. : What is Java?
Ques. : List important features of Java 12 release?
Ques. : List various versions of Java.
Ques. : What is difference between Path and Classpath variables in Java?
Ques. : What are the difference between C++ and Java?
Ques. : List major features of Java?
Ques. : What is the difference between JDK, JVM and JRE?
Ques. : Explain JIT concept in Java.
Ques. : What is WORA concept in Java?
Ques. : What do you mean by platform independence of Java?
Ques. : Explain the term Platform?
Ques. : What is the name of Java Compiler?
Ques. : What is the name of Java Interpreter?
Ques. : What is the extension name of Java?
Ques. : Can we override the static methods in Java?
Ques. : Explain the structure of  main method in Java?
Ques. : Why is the main method static in Java?
Ques. : Can we execute a program without main() method in Java?
Ques. : What is the default value of the local variables?
Ques. : What is the various access specifiers in java? Which one is applied by default in Java                Program.
Ques. : Can we overload java main method?
Ques. : What is ternary operator in java?
Ques. : What is the use of System class?
Ques. : What are the Java IDE’s?
Ques. : Is delete, next, main, exit or null keyword in java?

Class & Object

Ques. : What is a Class & Object in Java?
Ques. : What is inner class in java?
Ques. : What is anonymous inner class?
Ques. : Can we have multiple public classes in a java source file?
Ques. : What is the abstraction in Java?
Ques. : What is the encapsulation in Java?
Ques. : What is instance of keyword?
Ques. : What is this keyword in java?
Ques. : What is method overloading in Java?
Ques. : What is the final method/final class/final variable in Java?
Ques. : What is the difference between final, finally and finalize in java?
Ques. : What is the difference between Local variable, Instance variable and Class variables?
Ques. : What is the static method and variables in java?
Ques. : Can we declare a class as static?
Ques. : What is the use of System class?
Ques. : What is Wrapper Class in Java?
Ques. : Why are the objects immutable in java?
Ques. : What are the advantages of Java inner classes?
Ques. : What is a nested class?
Ques. : Is there any difference between nested classes and inner classes?
Ques. : What is object cloning?

Array

Ques. : What is Collection framework in Java?
Ques. : What is Vector and Array List in Java?
Ques. : What is Serialization and Deserialization in Java?
Ques. : What are autoboxing and unboxing?

Constructor & Garbage Collection

Ques. : What is constructor and Garbage Collector in java? How many types of Constructors                  are used in Java?
Ques. : What is default constructor?
Ques. : What is gc()?
Ques. : What is the purpose of the finalize() method?

String & String Buffer

Ques. : What is the difference between string & string buffer in Java?
Ques. : What is String Pool?
Ques. : How many ways can we create the string object?
Ques. : What is the purpose of toString() method in Java?
Ques. : Why CharArray() is preferred over String to store the password?

Inheritance

Ques. : What is method overriding in Java?
Ques. : What is the Inheritance in java? How many types of Inheritance implemented in Java?
Ques. : Why is multiple inheritance not supported in java?
Ques. : What is Super key in Java?
Ques. : What are the differences between this and super keyword?

Package & Interface

Ques. : What is Java Package and which package is imported by default?
Ques. : What is Interface in Java?
Ques. : Can an interface implement or extend another interface in Java?
Ques. : What is the difference between abstract class and interface in Java?
Ques. : What is package keyword in Java?

Polymorphism

Ques. : What is Polymorphism in Java? Explain its types.
Ques. : What is an abstract class in Java?

Multithreading

Ques. : What is a Thread in Java?
Ques. : What is a daemon Thread in Java?
Ques. : What is Thread Scheduler in java?
Ques. : What do you understand by thread pool?
Ques. : What is a multi threading in Java?
Ques. : How do you make a thread in Java?
Ques. : How do you stop a thread in java?
Ques. : What is thread life cycle in Java?
Ques. : What is Synchronization?

Java I/O

Ques. : What is the purpose of a Transient & Volatile Variable?
Ques. : What do you understand by an IO stream?

Exception Handling

Ques. : What is Exception Handling? What are its importance.
Ques. : Explain the hierarchy of Java Exception classes?
Ques. : What is the difference between Error and Exception?

JDBC Connectivity

Ques. : What is JDBC Connectivity?
Ques. : What is the role of JDBC Driver in connectivity?
Ques. : What are the JDBC API components?

Applets

Ques. : What is an applet in Java?
Ques. : Difference between notify() method and notifyAll() method in Java.

Advanced Java/Swing & AWT

Ques. : What is a JavaBean?
Ques. : What is RMI?

Miscellaneous

Ques. : What is Classloader & its different types in Java?
Ques. : What is Enum in Java?
Ques. : What is Java Annotations?
Ques. : What is composition in java?
Ques. : How to run a JAR file through command prompt?

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Categories: Java

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