Keyword| Meaning
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abstract| Specifies that a class or method will be implemented later, in a subclass
assert| Assert describes a predicate placed in a java program to indicate that the developer thinks that the predicate is always true at that place.
boolean| A data type that can hold True and False values only
break| A control statement for breaking out of loops.
byte| A data type that can hold 8-bit data values
case| Used in switch statements to mark blocks of text
catch| Catches exceptions generated by try statements
char| A data type that can hold unsigned 16-bit Unicode characters
class| Declares a new class
continue| Sends control back outside a loop
default| Specifies the default block of code in a switch statement
do| Starts a do-while loop
double| A data type that can hold 64-bit floating-point numbers
else| Indicates alternative branches in an if statement
enum| A Java keyword is used to declare an enumerated type. Enumerations extend the base class.
extends| Indicates that a class is derived from another class or interface
final| Indicates that a variable holds a constant value or that a method will not be overridden
finally| Indicates a block of code in a try-catch structure that will always be executed
float| A data type that holds a 32-bit floating-point number
for| Used to start a for loop
if| Tests a true/false expression and branches accordingly
implements| Specifies that a class implements an interface
import| References other classes
instanceof| Indicates whether an object is an instance of a specific class or implements an interface
int| A data type that can hold a 32-bit signed integer
interface| Declares an interface
long| A data type that holds a 64-bit integer
native| Specifies that a method is implemented with native (platform-specific) code
new| Creates new objects
null| This indicates that a reference does not refer to anything
package| Declares a Java package
private| An access specifier indicating that a method or variable may be accessed only in the class it’s declared in
protected| An access specifier indicating that a method or variable may only be accessed in the class it’s declared in (or a subclass of the class it’s declared in or other classes in the same package)
public| An access specifier used for classes, interfaces, methods, and variables indicating that an item is accessible throughout the application (or where the class that defines it is accessible)
return| Sends control and possibly a return value back from a called method
short| A data type that can hold a 16-bit integer
static| Indicates that a variable or method is a class method (rather than being limited to one particular object)
strictfp| A Java keyword is used to restrict the precision and rounding of floating-point calculations to ensure portability.
super| Refers to a class’s base class (used in a method or class constructor)
switch| A statement that executes code based on a test value
synchronized| Specifies critical sections or methods in multithreaded code
this| Refers to the current object in a method or constructor
throw| Creates an exception
throws| Indicates what exceptions may be thrown by a method
transient| Specifies that a variable is not part of an object’s persistent state
try| Starts a block of code that will be tested for exceptions
void| Specifies that a method does not have a return value
volatile| This indicates that a variable may change asynchronously
while| Starts a while loop