Java Features Lecture 1
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Questions and Answers

What is a similarity between Java and C/C++?

  • Dynamic memory allocation
  • Syntax (correct)
  • Multiple inheritance
  • Operator overloading

    • What is a benefit of Java's formal OOP type system?

  • Easier code development
  • Better code structure and consistency (correct)
  • Faster code execution
  • Improved network communication

    • Why is Java considered network-friendly?

  • Due to its multi-threaded nature
  • Due to built-in networking operations (correct)
  • Due to its portable nature
  • Due to its platform independence

    • What is a benefit of Java's robustness?

    <p>Improved security against malicious code</p> Signup and view all the answers

    What does the JVM 'verifier' check for?

    <p>Code structure and correctness</p> Signup and view all the answers

    What is the purpose of Java's dynamic checking?

    <p>To detect and prevent common bugs and security problems</p> Signup and view all the answers

    Why does Java have slightly worse performance than C?

    <p>Due to its additional checking for errors</p> Signup and view all the answers

    What is a benefit of Java's memory management?

    <p>Improved security against buffer overflow</p> Signup and view all the answers

    What led to a completely new way of looking at software development?

    <p>The massive growth of the Internet and the World-Wide Web</p> Signup and view all the answers

    What were some of the limitations of C and C++?

    <p>They were compiled, had no robust memory model, and no garbage collector</p> Signup and view all the answers

    What is one of the ways Java makes things easier for the programmer?

    <p>By putting more work on the CPU</p> Signup and view all the answers

    What is one of the original Java buzzwords?

    <p>Simple</p> Signup and view all the answers

    What is the core language of Java responsible for?

    <p>Handling variables, arrays, and objects</p> Signup and view all the answers

    What is the role of the JVM in Java?

    <p>To run the core language</p> Signup and view all the answers

    What is one of the benefits of Java's standard library classes?

    <p>They provide off-the-shelf code to perform basic tasks</p> Signup and view all the answers

    What is the result of Java programmers having access to a large set of standard library classes?

    <p>They are more productive</p> Signup and view all the answers

    Study Notes

    Java Features

    • Java emerged in 1995 as a response to the growth of the Internet and World-Wide Web, catering to the need for software that can run on different platforms like Windows, Linux, and Solaris.

    Design Goals of Java

    • Java aimed to address the limitations of languages like C and C++, which had compiled, no robust memory model, no garbage collector, and limited support of built-in libraries.

    Java Buzzwords

    • Java is described as a simple, object-oriented, distributed, interpreted, robust, secure, architecture-neutral, portable, high-performance, multithreaded, and dynamic language.

    Java Language and Libraries

    • Java consists of two parts: the core language (variables, arrays, objects) and the libraries (standard library classes that provide "off the shelf" code).
    • The Java Virtual Machine (JVM) runs the core language.
    • The core language is simple enough to run on small devices like phones, smart cards, and PDAs.
    • Java libraries include useful built-in classes like String, ArrayList, HashMap, StringTokenizer, and Date.

    Simple

    • Java has a similar syntax to C/C++, but is simpler with no operator overloading, no pointers, and no multiple inheritance.
    • Java's memory management is simpler than C or C++.

    Object-Oriented

    • Java is fundamentally based on object-oriented programming (OOP) notions of classes and objects.
    • Java uses a formal OOP type system that must be obeyed at compile-time and run-time.

    Distributed/Network Oriented

    • Java is network-friendly due to its portable, threaded nature, and built-in networking operations in the Java libraries.

    Robust/Secure/Safe

    • Java is robust, secure, and safe, with features like:
      • Verification of code structure by the JVM "verifier" to prevent unintentional errors and malicious code.
      • Dynamic checking at runtime for pointer and array access to prevent memory errors.
      • Prevention of common bugs and security problems like buffer overflow.
      • Easier debugging due to runtime checks that catch errors.

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    Introduction to Java language features, covering design goals and platform independence.

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