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Questions and Answers
What is the primary purpose of Java?
What is the primary purpose of Java?
To write once and run anywhere (WORA)
Who developed Java?
Who developed Java?
James Gosling
Which of these statements about Java is true?
Which of these statements about Java is true?
Java applications are compiled to bytecode.
Java applications are compiled to bytecode.
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What does JVM stand for?
What does JVM stand for?
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Java code is compiled to __________.
Java code is compiled to __________.
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What is included in the Java Development Kit (JDK)?
What is included in the Java Development Kit (JDK)?
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What is the role of the Garbage Collector in Java?
What is the role of the Garbage Collector in Java?
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You can compile a Java program without JDK installed.
You can compile a Java program without JDK installed.
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Match the following parts of Java with their definitions:
Match the following parts of Java with their definitions:
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Study Notes
Introduction to Java
- Java is a class-based, object-oriented programming language focused on minimal implementation dependencies.
- It supports the concept of "Write Once, Run Anywhere" (WORA), allowing compiled Java code to run on any platform that supports Java without recompilation.
- Released in 1995 and developed by James Gosling at Sun Microsystems, which is now part of Oracle Corporation.
- Noted for its simplicity, robustness, and security, making it popular for enterprise-level applications.
- Java applications generate bytecode, which is executed by the Java Virtual Machine (JVM).
Java Terminology
- Java Virtual Machine (JVM): Executes bytecode generated by the Java compiler (JAVAC) and ensures platform independence.
- Bytecode: The compiled form of Java source code, saved as a .class file, ready for execution by the JVM.
- Java Development Kit (JDK): A comprehensive toolkit including the compiler, Java Runtime Environment (JRE), debuggers, and more, necessary for creating and running Java programs.
- Java Runtime Environment (JRE): Component of JDK required to run Java applications, includes JVM and support browser, applet, and plugins but not compilation.
- Garbage Collector: Automatic memory management tool in Java that reclaims memory from unreferenced objects, simplifying memory management for programmers.
- ClassPath: The file path where the Java runtime and compiler look for .class files, defaults include JDK libraries; external libraries must be added to this path.
Features of Java
- Platform Independent: Java’s bytecode can execute on any operating system (Windows, Linux, macOS) without modification due to the unique JVM for each OS.
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Object-Oriented Programming Language: Utilizes objects and classes, based on four main concepts:
- Abstraction: Hiding complex realities while exposing only the necessary parts.
- Encapsulation: Bundling data with methods that operate on that data.
- Inheritance: Mechanism for a new class to inherit properties and behavior from an existing class.
- Polymorphism: Ability to present the same interface for different underlying data types.
- Simplicity: Lacks complex features such as pointers, operator overloading, and multiple inheritance, making it easier to learn and use.
- Robustness: Designed to detect and handle errors early, with extensive error-checking capabilities, improving reliability.
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Description
Explore the fundamentals of Java in this quiz based on Unit 1 of the Core JAVA curriculum. Learn about Java's object-oriented principles and its significance in application development. Test your knowledge on the key concepts that make Java a versatile programming language.
