quiz 1

Which of the following option leads to the portability and security of Java?

• 1. Bytecode is executed by JVM

• 1. The applet makes the Java code secure and portable

• 1. Use of exception handling

• 1. Dynamic binding between objects

Answer explanation

Bytecode is executed by the Java Virtual Machine (JVM), which allows Java programs to run on any platform that has a JVM, ensuring portability. Additionally, the JVM provides a secure environment for executing Java code.

Which of the following is not a Java features?

• 1. Dynamic

• 1. Architecture Neutral

• 1. Use of pointers

• 1. Object-oriented

Answer explanation

Java does not use pointers, which are a feature of languages like C and C++. Instead, Java uses references to manage memory, making it safer and easier to use. Thus, 'Use of pointers' is not a Java feature.

Which of the following statements is true about Java's memory management?

• 1. Java requires explicit deallocation of memory

• 1. Java has automatic garbage collection

• 1. Java uses manual memory management

• 1. Java does not support memory management

Answer explanation

Java has automatic garbage collection, which means it automatically manages memory allocation and deallocation, freeing developers from the need for explicit memory management.

What is the primary purpose of the Java Virtual Machine (JVM)?

• 1. To compile Java code into machine code

• 1. To execute Java bytecode

• 1. To provide a user interface for Java applications

• 1. To manage Java libraries

Answer explanation

The primary purpose of the Java Virtual Machine (JVM) is to execute Java bytecode, which allows Java programs to run on any device that has a JVM, ensuring platform independence.

Which of the following is a characteristic of Java's platform independence?

• 1. Java code requires a specific hardware configuration

• 1. Java code is only executable on Windows

• 1. Java code must be recompiled for each operating system

• 1. Java code can run on any operating system without modification

Answer explanation

Java's platform independence means that Java code can run on any operating system without modification, thanks to the Java Virtual Machine (JVM) which abstracts the underlying hardware and OS specifics.