Questions and Answers
What is the primary reason Java is considered a platform-independent language?
Which component is NOT included in the Java Development Kit (JDK)?
What does the Java Runtime Environment (JRE) allow users to do?
Which of the following is a responsibility of the Java Garbage Collector?
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What must be done to use external libraries in Java?
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Which of the following is NOT a principle of Object-Oriented Programming in Java?
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Which feature contributes to making Java a simple programming language?
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What results from compiling a Java program on one operating system and executing it on another?
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What does the acronym WORA stand for in Java programming?
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What is the role of the JAVA compiler JAVAC?
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Which statement best describes the Java Virtual Machine (JVM)?
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What key feature does Java have regarding code portability?
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Who developed the Java programming language?
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Which of the following statements about Java is NOT true?
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What makes Java a robust programming language?
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How does Java support code reusability?
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Study Notes
Overview of Java
- Class-based, object-oriented programming language with minimal implementation dependencies.
- Aim: Write once, run anywhere (WORA) - compiled code runs on any Java-supporting platform without recompilation.
- First released in 1995, developed by James Gosling at Sun Microsystems, later acquired by Oracle Corporation.
- Popular for desktop, web, and mobile application development due to its simplicity, robustness, and security features.
Java Features
- Platform Independent: Java compiles source code to bytecode, which is executed by the Java Virtual Machine (JVM) on various platforms (Windows, Linux, macOS) producing consistent output.
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Object-Oriented: Encourages organizing programs into collections of objects representing class instances, focusing on four main principles:
- Abstraction
- Encapsulation
- Inheritance
- Polymorphism
- Simplicity: Lacks complex features such as pointers, operator overloading, and explicit memory allocation, making it easier for developers.
Java Terminology
- Java Virtual Machine (JVM): Executes bytecode generated by the Java compiler, ensuring platform independence with different JVMs across operating systems.
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Bytecode: Intermediate code generated by the
javaccompiler, stored in.classfiles, executable by the JVM. - Java Development Kit (JDK): Comprehensive package including compiler, Java Runtime Environment (JRE), debuggers, and documentation necessary for creating and running Java applications.
- Java Runtime Environment (JRE): Part of JDK, allows execution of Java programs but does not compile them. Includes JVM, browser support, and plugins.
- Garbage Collector: Automatically manages memory by reclaiming memory occupied by unreferenced objects, simplifying memory management for programmers. Objects that are still referenced cannot be collected.
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Classpath: Directory path where Java runtime and compiler look for
.classfiles. Default provided libraries can be extended with external libraries added to the classpath.
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Description
This quiz explores the fundamentals of Java, a class-based, object-oriented programming language designed for versatility and ease of use. Participants will learn about its history, features, and the concept of 'write once, run anywhere' (WORA). Join to test your knowledge on Java's applications in various environments.
