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Java Keywords

The Java programming language has 50 keywords. Each keyword has a specific meaning in the language. You can't use a keyword for anything other than its pre-assigned meaning. The following table lists Java's keywords.

Keyword What It Does
abstract Indicates that the details of a class, a method, or an interface are given elsewhere in the code.
assert Tests the truth of a condition that the programmer believes is true.
boolean Indicates that a value is either true or false.
break Jumps out of a loop or switch.
byte Indicates that a value is an 8-bit whole number.
case Introduces one of several possible paths of execution in a switch statement.
catch Introduces statements that are executed when something interrupts the flow of execution in a try clause.
char Indicates that a value is a character (a single letter, digit, punctuation symbol, and so on) stored in 16 bits of memory.
class Introduces a class a blueprint for an object.
const You can’t use this word in a Java program. The word has no meaning but, because it’s a keyword, you can’t create a variable named const.
continue Forces the abrupt end of the current loop iteration and begins another iteration.
default Introduces a path of execution to take when no case is a match in a switch statement.
do Causes the computer to repeat some statements over and over again (for instance, as long as the computer keeps getting unacceptable results).
double Indicates that a value is a 64-bit number with one or more digits after the decimal point.
else Introduces statements that are executed when the condition in an if statement isn’t true.
enum Creates a newly defined type a group of values that a variable can have.
extends Creates a subclass a class that reuses functionality from a previously defined class.
final Indicates that a variable’s value cannot be changed, that a class’s functionality cannot be extended, or that a method cannot be overridden.
finally Introduces the last will and testament of the statements in a try clause.
float Indicates that a value is a 32-bit number with one or more digits after the decimal point.
for Gets the computer to repeat some statements over and over again (for instance, a certain number of times).
goto You can’t use this word in a Java program. The word has no meaning. Because it’s a keyword, you can’t create a variable named goto.
if Tests to see whether a condition is true. If it’s true, the computer executes certain statements; otherwise, the computer executes other statements.
implements Indicates that a class provides bodies for methods whose headers are declared in an interface.
import Enables the programmer to abbreviate the names of classes defined in a package.
instanceof Tests to see whether a certain object comes from a certain class.
int Indicates that a value is a 32-bit whole number.
interface Introduces an interface. An interface is like a class but, for the most part, an interface’s methods have no bodies.
long Indicates that a value is a 64-bit whole number.
native Enables the programmer to use code that was written in a language other than Java.

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