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Java MCQ: Which of these keywords is used to define interfaces in Java? a) interface b) intf c) implement d) None of the above Answer: a) interface Explanation: The interface keyword in Java is used to define an interface, which is a reference type that can contain only abstract methods, static methods, default methods, and […]

Java MCQ: Which of these are selection statements in Java? a) if b) switch c) break d) a and b Answer: d) a and b Explanation: The if and switch statements in Java are selection statements that allow the program to make decisions and execute specific blocks of code based on conditions. Reference links: https://www.rameshfadatare.com/learn-java-programming/

Java MCQ: Which exception is thrown when Java is out of memory? a) MemoryError b) OutOfMemoryError c) NullPointerException d) IOException Answer: b) OutOfMemoryError Explanation: When the Java Virtual Machine (JVM) runs out of memory, it throws an OutOfMemoryError. This error indicates that the JVM cannot allocate an object because it is out of memory and

Java MCQ: What is the extension of compiled Java classes? a) .js b) .class c) .java d) .exe Answer: b) .class Explanation: Compiled Java classes are stored in files with the .class extension. These files contain bytecode, which can be executed by the Java Virtual Machine (JVM). Reference links: https://www.rameshfadatare.com/learn-java-programming/ https://www.javaguides.net/p/java-tutorial-learn-java-programming.html

Java MCQ: What is Truncation in Java? a) Removing decimal part from a number b) Rounding off a number c) Converting float to int d) None of the above Answer: a) Removing decimal part from a number Explanation: Truncation in Java refers to the process of removing the fractional part (decimal part) from a number,

Java MCQ: What is not the use of the “this” keyword in Java? a) Referring to the current class instance variable b) Invoking the current class constructor c) Invoking the current class method d) Passing itself to the method Answer: c) Invoking the current class method Explanation: The this keyword in Java is used to

Java MCQ: Which of the following is not an OOPS concept in Java? a) Inheritance b) Encapsulation c) Polymorphism d) Compilation Answer: d) Compilation Explanation: Compilation is not an object-oriented programming (OOP) concept. The main OOP concepts in Java are Inheritance, Encapsulation, Polymorphism, and Abstraction. Reference links: https://www.rameshfadatare.com/learn-java-programming/ https://www.javaguides.net/p/java-tutorial-learn-java-programming.html

Java MCQ: Which environment variable is used to set the Java path? a) JAVA_HOME b) PATH c) CLASSPATH d) JRE_HOME Answer: a) JAVA_HOME Explanation: The JAVA_HOME environment variable is used to set the path to the Java Development Kit (JDK) installation directory. This variable is often required by Java applications to locate the correct Java

Java MCQ: What is the extension of Java code files? a) .js b) .txt c) .class d) .java Answer: d) .java Explanation: Java source code files have the extension .java. These files are compiled by the Java compiler into bytecode files with the extension .class. Reference links: https://www.rameshfadatare.com/learn-java-programming/ https://www.javaguides.net/p/java-tutorial-learn-java-programming.html

Java MCQ: Which of these cannot be used for a variable name in Java? a) identifier b) keyword c) variable d) method Answer: b) keyword Explanation: In Java, keywords cannot be used as variable names because they have predefined meanings in the language. Examples of keywords include int, class, public, and void. Reference links: https://www.rameshfadatare.com/learn-java-programming/

Java MCQ: Which one of the following is not a Java feature? a) Object-oriented b) Use of pointers c) Portable d) Dynamic Answer: b) Use of pointers Explanation: Java does not support the use of pointers, unlike C or C++. Pointers can lead to complex code and security vulnerabilities, which is why Java manages memory

Java MCQ: Which component is used to compile, debug and execute Java programs? a) JDK b) JRE c) JVM d) IDE Answer: a) JDK Explanation: The Java Development Kit (JDK) is the software development environment used to compile, debug, and execute Java programs. It includes the Java compiler, libraries, and tools necessary for Java development.

Java MCQ: Which statement is true about Java? a) Java is platform-independent b) Java is a procedure-oriented programming language c) Java does not support multithreading d) Java does not support the development of web applications Answer: a) Java is platform-independent Explanation: Java is platform-independent due to its use of the Java Virtual Machine (JVM), which

Java MCQ: Who invented Java Programming? a) James Gosling b) Dennis Ritchie c) Bjarne Stroustrup d) Guido van Rossum Answer: a) James Gosling Explanation: James Gosling, often referred to as the “father of Java,” invented Java programming language in 1995 while working at Sun Microsystems. Java was designed to be a platform-independent, object-oriented language with

Java MCQ: Which of the following is used to find and fix bugs in the program? a) Debugger b) Compiler c) JVM d) Interpreter Answer: a) Debugger Explanation: A debugger is a tool that is used to find and fix bugs in a program. It allows the developer to run the program step-by-step, inspect variables,

Java MCQ: What does the operator >>> do? a) Zero-fill right shift b) Signed right shift c) Left shift d) Signed left shift Answer: a) Zero-fill right shift Explanation: The >>> operator in Java is the zero-fill right shift operator. It shifts the bits of the operand to the right and fills the leftmost bits

Java MCQ: Which of the following statements are true about the finalize() method? a) It is called before an object is garbage collected b) It can be overridden in a subclass c) It is used to clean up resources before object destruction d) All of the above Answer: d) All of the above Explanation: All

Java MCQ: Identify the interface which is used to declare core methods in Java? a) java.lang.Object b) java.util.List c) java.lang.Runnable d) java.lang.Comparable Answer: d) java.lang.Comparable Explanation: The Comparable interface in Java is used to declare core methods for comparing objects. It defines the compareTo() method, which allows objects to be ordered. This interface is essential

Java MCQ: Where is the System class defined? a) java.lang package b) java.util package c) java.io package d) java.net package Answer: a) java.lang package Explanation: The System class is defined in the java.lang package, which is automatically imported into every Java program. This class provides access to system resources such as standard input, output, and

Java MCQ: Which of the following exception is thrown when a divide by zero statement is executed? a) ArithmeticException b) NullPointerException c) IOException d) ClassNotFoundException Answer: a) ArithmeticException Explanation: In Java, ArithmeticException is thrown when an exceptional arithmetic condition occurs, such as dividing by zero. This is a common runtime exception that does not require

Java MCQ: Exception created by try block is caught in which block? a) catch b) throw c) finally d) finalize Answer: a) catch Explanation: In Java, exceptions that are thrown within a try block are caught and handled by the corresponding catch block. The catch block allows you to define a response to the specific

Java MCQ: What is Runnable? a) An interface b) A class c) A method d) A package Answer: a) An interface Explanation: The Runnable interface in Java is used to define a task that can be executed by a thread. It has a single method, run(), that must be implemented by any class that implements

Java MCQ: When is the finalize() method called? a) Before garbage collection b) After garbage collection c) Before object creation d) After object creation Answer: a) Before garbage collection Explanation: The finalize() method is called by the garbage collector on an object when it determines that there are no more references to the object. It

Java MCQ: What is the implicit return type of a constructor? a) No return type b) void c) Object d) Class type Answer: a) No return type Explanation: Constructors in Java do not have a return type, not even void. They are used to initialize objects when they are created, and the return type is

Java MCQ: What is the variables declared in a class for the use of all methods of the class called? a) Instance variables b) Local variables c) Static variables d) Global variables Answer: a) Instance variables Explanation: Instance variables are declared within a class but outside of any method. They are used by all methods