Java Programming: Core Features, JVM Architecture, Multithreading, Exception Handling & Event-Driven GUI - Computer Application | Agrigyan

• Java Exception Handling Keywords:
• throw: Keyword used to explicitly throw or generate an exception from any method or block of code (e.g., throw new ArithmeticException("Divide by zero");).
• throws: Keyword used in method signatures to declare the exceptions that the method might throw.
• try: Encloses the block of code to monitor for exceptions.
• catch: Handles the specific exception thrown by a try block.
• Conclusion: An exception is explicitly generated using throw (Option 3).

Correct option: (3) Throw

• Hadoop Distributed File System (HDFS):
• Apache Hadoop and its core storage component, the Hadoop Distributed File System (HDFS), were created by Doug Cutting and Mike Cafarella and are implemented natively in Java.
• The NameNode, DataNodes, and Secondary NameNode run as Java Virtual Machine (JVM) daemon processes.
• Conclusion: Written in JAVA (Option 2).

Correct option: (2) JAVA

• Java Design Principles - Absence of Explicit Pointers:
• Java was designed to be secure, robust, and platform-independent:
• It intentionally eliminated explicit pointers and pointer arithmetic present in C/C++ to prevent memory leaks, buffer overflows, and unauthorized direct memory access.
• Memory management is handled automatically via references and garbage collection.
• Real Java features include: Object-oriented, Portable, Dynamic and Extensible.
• Conclusion: Use of pointers is NOT a Java feature (Option 2).

Correct option: (2) Use of pointers

• Prefix Increment Operator Evaluation in Java:
• Given variable: int g = 3;
• Expression to evaluate: ++g * 8
• In Java operator precedence, the prefix increment operator (++) has higher precedence than multiplication (*):
• ++g increments the value of g from 3 to 4 before its value is used in the expression.
• The incremented value (4) is then multiplied by 8:

• The result printed on screen is 32.
• Conclusion: 32 (Option 1).

Correct option: (1) 32