Values and operations as specified in IEEE Standard forīinary Floating-Point Arithmetic (ANSI/IEEE Std. ObjectsĪre always operated on, passed, and tested via values of typeĢ.3.2. Floating-Point Types, Value Sets, and Valuesįloat and double, which are conceptually associated with theģ2-bit single-precision and 64-bit double-precision format IEEE 754 More than one reference to an object may exist. Values of type reference can be thought of as pointers A reference to an object is considered to have An object is either a dynamically allocated class The Java Virtual Machine contains explicit Type support in the Java Virtual Machine instruction set, see Int, long, float, and double, respectively. Produce numeric results, but each is specialized for its operand type: For instance, iadd, ladd, fadd, andĭadd are all Java Virtual Machine instructions that add two numeric values and Instead, the instruction set of the Java Virtual Machineĭistinguishes its operand types using instructions intended to operate Their types at run time, or to be distinguished from values of Types need not be tagged or otherwise be inspectable to determine The Java Virtual Machine expects that nearlyĪll type checking is done prior to run time, typically by a compiler,Īnd does not have to be done by the Java Virtual Machine itself. Two kinds of values that can be stored in variables, passed asĪrguments, returned by methods, and operated upon: primitive Operates on two kinds of types: primitive typesĪnd reference types. Like the Java programming language, the Java Virtual Machine This specification are given with respect to The Unicode Left to the discretion of the implementor. Instructions (for example, translating them into machine code) are The memory layout of run-time data areas, the garbage-collectionĪlgorithm used, and any internal optimization of the Java Virtual Machine Unnecessarily constrain the creativity of implementors. Implementationĭetails that are not part of the Java Virtual Machine's specification would It does not describe any particular implementationĬorrectly, you need only be able to read the class file format andĬorrectly perform the operations specified therein. Public Design, Private ImplementationĪbstract machine. Method Invocation and Return Instructions 2.11.9. Operand Stack Management Instructions 2.11.7. Types and the Java Virtual Machine 2.11.2. Java Virtual Machine Floating-Point Arithmetic and IEEE 754 2.8.2. Normal Method Invocation Completion 2.6.5. Floating-Point Types, Value Sets, and Values 2.3.3.
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