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  2. Java performance - Wikipedia

    en.wikipedia.org/wiki/Java_performance

    Very different and hard-to-compare scenarios arise from these two different approaches: static vs. dynamic compilations and recompilations, the availability of precise information about the runtime environment and others. Java is often compiled just-in-time at runtime by the Java virtual machine, but may also be compiled ahead-of-time, as is

  3. Initialization-on-demand holder idiom - Wikipedia

    en.wikipedia.org/wiki/Initialization-on-demand...

    The implementation of the idiom relies on the initialization phase of execution within the Java Virtual Machine (JVM) as specified by the Java Language Specification (JLS). [3] When the class Something is loaded by the JVM, the class goes through initialization. Since the class does not have any static variables to initialize, the ...

  4. Java code coverage tools - Wikipedia

    en.wikipedia.org/wiki/Java_Code_Coverage_Tools

    instrument classes for coverage either offline (before they are loaded) or on the fly (using an instrumenting application classloader). Supported coverage types: class, method, line, basic block. EMMA can detect when a single source code line is covered only partially. Coverage stats are aggregated at method, class, package, and "all classes ...

  5. Class-based programming - Wikipedia

    en.wikipedia.org/wiki/Class-based_programming

    In class-based programming, inheritance is done by defining new classes as extensions of existing classes: the existing class is the parent class and the new class is the child class. If a child class has only one parent class, this is known as single inheritance , while if a child class can have more than one parent class, this is known as ...

  6. Java (programming language) - Wikipedia

    en.wikipedia.org/wiki/Java_(programming_language)

    Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (), [16] meaning that compiled Java code can run on all platforms that support Java without the need to recompile. [17]

  7. Lazy evaluation - Wikipedia

    en.wikipedia.org/wiki/Lazy_evaluation

    Java's lambda expressions are just syntactic sugar. Anything that can be written with a lambda expression can be rewritten as a call to construct an instance of an anonymous inner class implementing the interface, [ a ] and any use of an anonymous inner class can be rewritten using a named inner class, and any named inner class can be moved to ...

  8. Multiple inheritance - Wikipedia

    en.wikipedia.org/wiki/Multiple_inheritance

    In OCaml, parent classes are specified individually in the body of the class definition. Methods (and attributes) are inherited in the same order, with each newly inherited method overriding any existing methods. OCaml chooses the last matching definition of a class inheritance list to resolve which method implementation to use under ambiguities.

  9. Java syntax - Wikipedia

    en.wikipedia.org/wiki/Java_syntax

    If a class does not specify its superclass, it implicitly inherits from java.lang.Object class. Thus all classes in Java are subclasses of Object class. If the superclass does not have a constructor without parameters the subclass must specify in its constructors what constructor of the superclass to use. For example: