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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.
In Java, a foreach-construct was introduced in Java Development Kit (JDK) 1.5.0. [14] Official sources use several names for the construct. It is referred to as the "Enhanced for Loop", [14] the "For-Each Loop", [15] and the "foreach statement". [16] [17]: 264
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.
Java bytecode is the instruction set of the Java virtual machine (JVM), the language to which Java and other JVM-compatible source code is compiled. [1] Each instruction is represented by a single byte , hence the name bytecode , making it a compact form of data .
The Java 1.0 compiler was re-written in Java by Arthur van Hoff to comply strictly with the Java 1.0 language specification. [26] With the advent of Java 2 (released initially as J2SE 1.2 in December 1998 – 1999), new versions had multiple configurations built for different types of platforms.
The Java platform is a suite of programs that facilitate developing and running programs written in the Java programming language. A Java platform includes an execution engine (called a virtual machine), a compiler and a set of libraries; there may also be additional servers and alternative libraries that depend on the requirements.
The Java Development Kit (JDK) is a distribution of Java technology by Oracle Corporation. It implements the Java Language Specification ( JLS ) and the Java Virtual Machine Specification ( JVMS ) and provides the Standard Edition ( SE ) of the Java Application Programming Interface ( API ).
aload 1 dup mul As for most peephole optimizations, this is based on the relative efficiency of different instructions. In this case, dup (which duplicates and pushes the top of the stack ) is known/assumed to be more efficient than aload (which loads a local variable and pushes it onto the stack).