Java Technology Overview

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Questions and Answers

What is the role of the javac compiler in the Java programming language?

  • It interprets Java source code and executes it line by line.
  • It translates bytecode into machine code that can be directly executed by the processor.
  • It compiles Java source code into bytecode, which is then run by the Java Virtual Machine. (correct)
  • It creates a platform-specific executable file from the Java source code.

Which of the following statements is TRUE about the Java Virtual Machine (JVM)?

  • The JVM is a software environment that allows Java programs to run on different operating systems. (correct)
  • The JVM is a specific type of hardware that executes Java bytecode.
  • The JVM translates Java source code into machine code during execution.
  • The JVM is required for compiling Java source code into bytecode.

What is the primary advantage of using Java's API?

  • It allows developers to write code that is platform-independent.
  • It provides a set of pre-written code components that can be reused to build applications. (correct)
  • It allows developers to directly access the hardware resources of the underlying platform.
  • It simplifies the process of compiling Java source code into bytecode.

Which of the following is NOT a platform on which Java programs can run?

<p>DOS (D)</p> Signup and view all the answers

What is the purpose of the Java SE HotSpot VM's runtime optimization?

<p>To convert Java bytecode to machine code for faster execution. (C)</p> Signup and view all the answers

Why is Java considered a platform-independent programming language?

<p>Because Java source code is compiled into bytecode, which can be executed by the JVM on different platforms. (B)</p> Signup and view all the answers

What does the '.java' file extension indicate?

<p>A file containing source code written in the Java programming language. (A)</p> Signup and view all the answers

What is the difference between the Java platform and the Java Virtual Machine?

<p>The Java platform comprises the JVM, while the Java API is the set of libraries and tools that developers use to build Java applications. (B)</p> Signup and view all the answers

Flashcards

Java Virtual Machine

An abstract computing machine that enables executing Java bytecode.

Bytecode

An intermediate representation of Java source code that the JVM executes.

Java source files

Files containing Java code, ending with the .java extension, compiled to bytecode.

javac compiler

The Java compiler that converts .java files into .class files containing bytecode.

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Platform in Java

The hardware/software environment where a Java program runs, unique to Java.

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API in Java

A collection of pre-built software components that extends Java's capabilities.

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Cross-platform capability

Ability of Java applications to run on any OS without modification, due to JVM.

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Java Language Changes

Improvements in the language features introduced in SE 9 and later releases.

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Study Notes

Java Technology Overview

  • Java is both a programming language and a platform.
  • Java source code (.java files) is compiled into bytecode (.class files) by the javac compiler.
  • Bytecode is the machine language of the Java Virtual Machine (JVM).
  • The java launcher runs applications using the JVM.
  • Java programs are platform-independent; the same .class files can run on various OSs (Windows, Solaris, Linux, macOS).
  • JVMs like HotSpot optimize performance through runtime enhancements like identifying bottlenecks and recompiling code to native code.

Java Virtual Machine (JVM)

  • The JVM is the foundation of the Java platform.
  • The JVM is ported to different hardware platforms.
  • This allows a Java application to run on a variety of platforms without modification.

Java Platform Components

  • The Java platform comprises the JVM and the API.
  • The API is a vast library of ready-made software components organized into packages.
  • Packages contain related classes and interfaces.
  • The JVM and API insulate the program from the underlying hardware, making the code platform-independent.

Platform Independence vs. Performance

  • Java's platform independence can sometimes result in slightly slower performance compared to native code.
  • Ongoing advancements in compiler and JVM technologies are closing this performance gap without sacrificing portability.

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