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  2. Java version history - Wikipedia

    en.wikipedia.org/wiki/Java_version_history

    The Java language has undergone several changes since JDK 1.0 as well as numerous additions of classes and packages to the standard library.Since J2SE 1.4, the evolution of the Java language has been governed by the Java Community Process (JCP), which uses Java Specification Requests (JSRs) to propose and specify additions and changes to the Java platform.

  3. Java syntax - Wikipedia

    en.wikipedia.org/wiki/Java_syntax

    64-bit (8-byte) 0: float: java.lang.Float: floating point number ±1.401298E−45 through ±3.402823E+38 32-bit (4-byte) 0.0f [4] double: java.lang.Double: floating point number ±4.94065645841246E−324 through ±1.79769313486232E+308 64-bit (8-byte) 0.0: boolean: java.lang.Boolean: Boolean true or false: 1-bit (1-bit) false: char: java.lang ...

  4. List of Java keywords - Wikipedia

    en.wikipedia.org/wiki/List_of_Java_keywords

    As multiple inheritance is not allowed in Java, interfaces are used to circumvent it. An interface can be defined within another interface. long The long keyword is used to declare a variable that can hold a 64-bit signed two's complement integer. [5] [6] This keyword is also used to declare that a method returns a value of the primitive type ...

  5. List of Java bytecode instructions - Wikipedia

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

    1.0 push the constant 1.0 (a double) onto the stack ddiv 6f 0110 1111 value1, value2 → result divide two doubles dload 18 0001 1000 1: index → value load a double value from a local variable #index: dload_0 26 0010 0110 → value load a double from local variable 0 dload_1 27 0010 0111 → value load a double from local variable 1 dload ...

  6. Word (computer architecture) - Wikipedia

    en.wikipedia.org/wiki/Word_(computer_architecture)

    The z/Architecture, which is the 64-bit member of that architecture family, continues to refer to 16-bit halfwords, 32-bit words, and 64-bit doublewords, and additionally features 128-bit quadwords. In general, new processors must use the same data word lengths and virtual address widths as an older processor to have binary compatibility with ...

  7. Snake case - Wikipedia

    en.wikipedia.org/wiki/Snake_case

    Snake case (sometimes stylized autologically as snake_case) is the naming convention in which each space is replaced with an underscore (_) character, and words are written in lowercase. It is a commonly used naming convention in computing , for example for variable and subroutine names, and for filenames .

  8. Java performance - Wikipedia

    en.wikipedia.org/wiki/Java_performance

    Because of this, the lowest 3 bits of a heap reference will always be 0. By lowering the resolution of 32-bit references to 8 byte blocks, the addressable space can be increased to 32 GB. This significantly reduces memory use compared to using 64-bit references as Java uses references much more than some languages like C++. Java 8 supports ...

  9. Bit - Wikipedia

    en.wikipedia.org/wiki/Bit

    The bit is the most basic unit of information in computing and digital communication. The name is a portmanteau of binary digit.26 [1] The bit represents a logical state with one of two possible values. These values are most commonly represented as either " 1" or "0 ", but other representations such as true/false, yes/no, on/off, or +/− are ...