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2. List of Java keywords - Wikipedia

   en.wikipedia.org/wiki/List_of_Java_keywords

   assert (added in J2SE 1.4) [4] Assert describes a predicate (a true–false statement) placed in a Java program to indicate that the developer thinks that the predicate is always true at that place. If an assertion evaluates to false at run-time, an assertion failure results, which typically causes execution to abort.

3. List of Java bytecode instructions - Wikipedia

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

   push the constant 0.0 (a double) onto the stack dconst_1 0f 0000 1111 → 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 ...

4. Java syntax - Wikipedia

   en.wikipedia.org/wiki/Java_syntax

   Unlike C++, Java has no global functions or variables, but has data members which are also regarded as global variables. All code belongs to classes and all values are objects . The only exception is the primitive data types , which are not considered to be objects for performance reasons (though can be automatically converted to objects and ...

5. Assertion (software development) - Wikipedia

   en.wikipedia.org/wiki/Assertion_(software...

   In computer programming, specifically when using the imperative programming paradigm, an assertion is a predicate (a Boolean-valued function over the state space, usually expressed as a logical proposition using the variables of a program) connected to a point in the program, that always should evaluate to true at that point in code execution.

6. Uninitialized variable - Wikipedia

   en.wikipedia.org/wiki/Uninitialized_variable

   Java does not have uninitialized variables. Fields of classes and objects that do not have an explicit initializer and elements of arrays are automatically initialized with the default value for their type (false for boolean, 0 for all numerical types, null for all reference types). [ 4 ]

7. Instance variable - Wikipedia

   en.wikipedia.org/wiki/Instance_variable

   [1] [2] An instance variable has similarities with a class variable, [3] but is non-static. An instance variable is a variable which is declared in a class but outside of constructors, methods, or blocks. Instance variables are created when an object is instantiated, and are accessible to all the constructors, methods, or blocks in the class.

8. Class variable - Wikipedia

   en.wikipedia.org/wiki/Class_variable

   Thus in some languages, static member variable or static member function are used synonymously with or in place of "class variable" or "class function", but these are not synonymous across languages. These terms are commonly used in Java , C# , [ 5 ] and C++ , where class variables and class methods are declared with the static keyword , and ...

9. Primitive wrapper class in Java - Wikipedia

   en.wikipedia.org/.../Primitive_wrapper_class_in_Java

   With Java 5.0, additional wrapper classes were introduced in the java.util.concurrent.atomic package. These classes are mutable and cannot be used as a replacement for the regular wrapper classes. Instead, they provide atomic operations for addition, increment and assignment. The atomic wrapper classes and their corresponding types are: