Java Keywords

A keyword used to make the assumed value of a condition explicit. If the condition is not true, an AssertionError is thrown.

An 8-bit integer. A keyword used to declare an expression, method return value, or variable of type byte.

A 16-bit Unicode character. A Java keyword used to declare an expression, method return value, or variable of type character.

A type that defines the implementation of a particular kind of object. A class definition defines instance and class fields, methods, and inner classes as well as specifying the interfaces the class implements and the immediate superclass of the class. If the superclass is not explicitly specified, the superclass is implicitly Object.

This keyword is not used by current versions of the Java programming language.

Used to resume program execution at the end of the current loop body. If followed by a label, continue resumes execution at the end of the enclosing labeled loop body.

Defines a group of statements to begin executing if the value defined by the enclosing switch statement does not match any value specified by a case keyword in the switch statement.

Used to declare a loop that will iterate a block of statements. The loop's exit condition is specified with the while keyword. The loop will execute once before evaluating the exit condition.

A 64-bit floating point value. A Java keyword used to declare an expression, method return value, or variable of type double-precision floating point number.

Used to define a statement or block of statements that are executed in the case that the test condition specified by the if keyword evaluates to false.

Define an entity once that cannot be changed nor derived from later. More specifically: a final class cannot be subclassed, a final method cannot be overridden, and a final variable can occur at most once as a left-hand expression. All methods in a final class are implicitly final.

Used to define a block of statements for a block defined previously by the try keyword. The finally block is executed after execution exits the try block and any associated catch clauses regardless of whether an exception was thrown or caught.

A 32-bit floating point value. A Java keyword used to declare an expression, method return value, or variable of type single-precision floating point number.

This keyword is not used by current versions of the Java programming language.

Used to conduct a conditional test and execute a block of statements if the test evaluates to true. If an optional block is defined with the else keyword, then the else block is executed if the test evaluates to false.

A 32-bit integer value. A Java keyword used to declare an expression, method return value, or variable of type integer.

Used in method declarations to specify that the method is not implemented in the same Java source file, but rather in another language.

A keyword used to create an instance of a class or array.

An access modifier used in a method, field or inner class declaration. It signifies that the member can only be accessed by elements residing in its class, subclasses, or classes in the same package.

Used to finish the execution of a method. It can be followed by a value required by the method definition that is returned to the caller.

A 16-bit integer value. Used to declare an expression, method return value, or variable of type short integer.

A Java keyword used to restrict the precision and rounding of floating point calculations to ensure portability.

Used to evaluate a variable that can later be matched with a value specified by the case keyword in order to execute a group of statements.

A reference literal value.

A boolean literal value.