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  2. Option type - Wikipedia

    en.wikipedia.org/wiki/Option_type

    In programming languages (especially functional programming languages) and type theory, an option type or maybe type is a polymorphic type that represents encapsulation of an optional value; e.g., it is used as the return type of functions which may or may not return a meaningful value when they are applied.

  3. Classpath - Wikipedia

    en.wikipedia.org/wiki/Classpath

    Classpath. Classpath is a parameter in the Java Virtual Machine or the Java compiler that specifies the location of user-defined classes and packages. The parameter may be set either on the command-line, or through an environment variable .

  4. Java package - Wikipedia

    en.wikipedia.org/wiki/Java_package

    java.text Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages. java.rmi Provides the RMI package. java.time The main API for dates, times, instants, and durations. java.beans The java.beans package contains classes and interfaces related to JavaBeans components. java.applet

  5. List of Java keywords - Wikipedia

    en.wikipedia.org/wiki/List_of_Java_keywords

    List of Java keywords. In the Java programming language, a keyword is any one of 68 reserved words [1] that have a predefined meaning in the language. Because of this, programmers cannot use keywords in some contexts, such as names for variables, methods, classes, or as any other identifier. [2]

  6. Java class file - Wikipedia

    en.wikipedia.org/wiki/Java_class_file

    A Java class file is a file (with the .class filename extension) containing Java bytecode that can be executed on the Java Virtual Machine (JVM).A Java class file is usually produced by a Java compiler from Java programming language source files (.java files) containing Java classes (alternatively, other JVM languages can also be used to create class files).

  7. Java syntax - Wikipedia

    en.wikipedia.org/wiki/Java_syntax

    Java syntax. The syntax of Java is the set of rules defining how a Java program is written and interpreted. The syntax is mostly derived from C and C++. Unlike in C++, in Java there are no global functions or variables, but there are data members which are also regarded as global variables. All code belongs to classes and all values are objects.

  8. Command-line argument parsing - Wikipedia

    en.wikipedia.org/wiki/Command-line_argument_parsing

    C. C uses argv to process command-line arguments. [1][2] An example of C argument parsing would be: #include <stdio.h> int main (int argc, char *argv[]) { int count; for (count = 0; count < argc; count++) puts (argv[count]); } C also has functions called getopt and getopt_long.

  9. List of Java bytecode instructions - Wikipedia

    en.wikipedia.org/wiki/List_of_Java_bytecode...

    This is a list of the instructions that make up the Java bytecode, an abstract machine language that is ultimately executed by the Java virtual machine. [ 1] The Java bytecode is generated from languages running on the Java Platform, most notably the Java programming language . Note that any referenced "value" refers to a 32-bit int as per the ...