Java Keywords

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A Java keyword used in a class definition to specify that a class is not to be instantiated, but rather inherited by other classes.

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abstract

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A Java keyword used to resume program execution at the statement immediately following the current statement. If followed by a label, the program resumes execution at the labeled statement.

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break

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A Java keyword that defines a group of statements to begin executing if a value specified matches the value defined by a preceding switch keyword.

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case

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A Java keyword used to declare a block of statements to be executed in the event that a Java exception, or run time error, occurs in a preceding try block.

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catch

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A Java keyword used to declare a a single 16-bit Unicode character variable.

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char

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A Java keyword used to resume program execution at the end of the current loop. If followed by a label, it resumes execution where the label occurs.

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continue

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A Java keyword optionally used after all case conditions in a switch statement. If all case conditions are not matched by the value of the switch variable, this keyword will be executed.

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default

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A Java keyword used to declare a loop that will iterate a block of statements. The loop's exit condition can be specified with the while keyword.

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do

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A Java keyword used to define a a double-precision 64-bit IEEE 754 floating point variable.

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double

Hint 9

For decimal values, this data type is generally the default choice.

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A Java keyword used to execute a block of statements in the case that the test condition with the if keyword evaluates to false.

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else

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A Java keyword used to declare an enumerated type, whose legal values consist of a fixed set of constants.

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enum

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A Java keyword used to define an entity once and cannot change it or derive from it later.

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final

Hint 12

A class with this keyword cannot be subclassed, a method with this keyword cannot be overridden and a variable with this keyword cannot change from its initialized value.

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A Java keyword that executes a block of statements regardless of whether a Java Exception, or run time error, occurred in a block defined previously by the try keyword.

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finally

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A Java keyword used to define a a single-precision 32-bit IEEE 754 floating point number variable.

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float

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A Java keyword used to declare a loop that reiterates statements. The programmer can specify the statements to be executed, exit conditions, and initialization variables for the loop.

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for

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A Java keyword used to conduct a conditional test and execute a block of statements if the test evaluates to true.

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if

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A Java keyword included in the class declaration to specify any interfaces that are used by the current class.

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implements

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A Java keyword used at the beginning of a source file that can specify classes or entire packages to be referred to later without including their package names in the reference.

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import

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A Java keyword used to define a 32-bit signed two's complement integer variable.

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int

Hint 19

For integral values, this data type is generally the default choice unless there is a reason to choose something else.

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A Java keyword used to define a collection of method definitions and constant values. It can be implemented by other classes with the "implements" keyword.

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interface

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A Java keyword used to define a 64-bit signed two's complement integer variable.

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long

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

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native

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A Java keyword used to create an instance of a class.

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new

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A Java keyword used in a method or variable declaration. It signifies that the method or variable can only be accessed by other elements of its class

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private

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A Java keyword used in a method or variable declaration. It signifies that the method or variable can only be accessed by elements residing in its class, subclasses, or classes in the same package.

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protected

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A Java keyword used in a method or variable declaration. It signifies that the method or variable can be accessed by elements residing in other classes.

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public

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A Java keyword that causes the code to exit from the current method, and the control flow returns to where the method was invoked.

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return

Hint 27

It has two forms: one that returns a value, and one that doesn't.

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A Java keyword used to define a 16-bit signed two's complement integer variable.

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short

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A Java keyword used to define a variable as a class variable. Classes maintain one copy of class variables regardless of how many instances exist of that class.

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static

Hint 29

This keyword can also be used to define a method as a class method. Class methods are invoked by the class instead of a specific instance, and can only operate on class variables.

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A Java keyword used to access members of a class inherited by the class in which it appears.

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super

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A Java keyword 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.

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switch

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A keyword in the Java programming language that, when applied to a method or code block, guarantees that at most one thread at a time executes that code.

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synchronized

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A Java keyword that can be used to represent an instance of the class in which it appears. It can be used to access class variables and methods.

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this

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A Java keyword that enables the programmer to _____ an exception at that point in the code. The exception will be caught by the nearest try-catch clause that can catch that type of exception.

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throw

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A Java keyword used in method declarations that specify which exceptions are not handled within the method but rather passed to the next higher level of the program.

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throws

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A keyword in the Java programming language that indicates that a field is not part of the serialized form of an object.

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transient

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A Java keyword that defines a block of statements that may throw a Java language exception. If an exception is thrown, an optional catch block can handle specific exceptions thrown within that block. Also, an optional finally block will be executed regardless of whether an exception is thrown or not.

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try

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A Java keyword used in method declarations to specify that the method does not return any value. It can also be used as a nonfunctional statement.

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void

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A Java keyword used in variable declarations that specifies that the variable is modified asynchronously by concurrently running threads.

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volatile

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A Java keyword used to declare a loop that iterates a block of statements. The loop's exit condition is specified as part of this statement.

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while