Keywords In Java

Data Types
1) byte
2) short

3) int

4) long

long keyword is used to declare primitive long type of variables.

5) float

float keyword is used to declare primitive float type of variables.

6) double

double keyword is used to declare primitive double type of variables.

7) char

char keyword is used to declare primitive character type of variables.

8) boolean

boolean keyword is used to declare primitive boolean type of variables.

9) var

var keyword is used to declare a variable of any type. It is introduced from Java 10.

Control Flow Statements
10) if

if keyword is used to define if condition statements or blocks.

11) else

else keyword is used in if-else blocks.

12) for

13) while

14) do

do keyword is used in do-while loops.

15) switch

switch keyword is used to define switch blocks or switch expressions (From Java 12).

16) case

case keyword is used to define case labels in a switch block.

17) break

break keyword is used to break a loop or a block.

18) continue

continue keyword is used to stop the execution of current iteartion and start the execution of next iteration in a loop.

19) default

default keyword is used in switch blocks to define default case label and also used to define default methods (from Java 8).

20) yield

yield keyword (From Java 13) is used in switch expressions.

OOP Concepts

21) class

class keyword is used to define a class in Java.

22) new

new keyword is used while instantiating a class.

23) static

static keyword is used to define static members of a class.

24) interface

interface keyword is used to define an interface.

25) extends

extends keyword is used when a class is extending or inheriting another class.

26) implements

implements keyword is used to implement an interface.

27) super

super keyword is used to access super class members inside a sub class.

28) this

this keyword is used to access other members of the same class.

29) abstract

abstract keyword is used to define abstract classes and abstract methods.

30) final

final keyword is used to define final classes and final methods.

31) package

package keyword is used to specify a package for the current file.

32) enum

enum keyword is used to define enum types.

Access Modifiers
33) private

private keyword is used to define private fields, private methods and private constructors.

34) protected

protected keyword is used to define protected fields, protected methods and protected constructors.

35) public

public keyword is used to define public classes, public fields, public methods and public constructors.
Exception Handling

36) try

try keyword is used to define a try block.

37) catch

catch keyword is used to define a catch block.

38) finally

finally keyword is used to define a finally block.

39) throw

throw keyword is used to throw an exception manually.

40) throws

throws keyword is used to specify the exceptions which may be thrown by the current method.

Threads
41) synchronized

synchronized keyword is used to define synchronized blocks.

42) volatile

volatile keyword is used to define a volatile field whose value is always read from the main memory.

Java 9 Modules
43) module

module keyword is used to define a module.

44) exports

exports keyword is used to export all public members of a package in a module.

45) requires

requires keyword is used to specify required libraries inside a module.

46) open

open keyword is used to create an open module. An open module grants reflective access of all of its packages to other modules.

47) opens

It is used to expose specific packages for reflective access by other modules.

48) uses

It specifies the services consumed by the current module.

49) provides

It specifies services provided by the current module.

Java 17 Sealed Classes And Interfaces

50) sealed

sealed keyword is used to define sealed classes and interfaces.

51) non-sealed

non-sealed keyword is used to define non-sealed classes and interfaces.

52) permits

permits keyword is used to specify the sub classes that can extend the sealed class directly.

Others

53) void

void keyword is used to indicate that method returns nothing.

54) return

return keyword is used to return a value from a method or a block.

55) transient

transient keyword is used in serialization. A variable which is declared as transient will not be eligible for serialization.

56) strictfp

strictfp keyword is used to implement the strict precision of floating point calculations on different platforms. strictfp can be used with classes, interfaces and methods.

57) import

import keyword is used to import external resources into current Java file.

58) instanceOf

instanceOf is used to check whether an object is of specified type.

59) native

native keyword is used with a method to indicate that a particular method is implemented in native code using Java Native Interfaces(JNI).

60) record

61) assert


62) const

63) goto


64) _ (Underscore)