Keywords in Java are reserved words that have predefined meanings and functionalities in the Java programming language.
These words cannot be used as identifiers (such as variable names, class names, method names, etc.) because they are already used by the language for specific purposes.
Here's a list of Java keywords:
boolean: it stores boolean data type.
byte: it stores byte data type.
short: it stores short data type.
int: it stores int data type.
long: it stores long data type.
float: it stores float data type.
double: it stores double data type.
char: it stores char data type.
if: Used to execute a block of code if a condition is `true`, otherwise `else` block if the condition is `false`.
else: Used to execute a block of code if a condition is `true`, otherwise `else` block if the condition is `false`.
switch: Evaluates an expression and executes code blocks based on the value of the expression.
case: Used to define specific values or conditions that the switch expression may match.
default: Used as a fallback option when none of the case values match the switch expression.
while: Executes a block of code as long as a specified condition is true.
do: Similar to a while loop but executes the code block at least once, and then repeats it as long as a specified condition is true.
for: Used to execute a block of code repeatedly for a specified number of times.
break: Used to exit a loop or switch statement prematurely.
continue: Skips the remaining code inside a loop and proceeds to the next iteration.
return: Exits from a method, optionally returning a value.
class: The class keyword is used to declare a new class.
extends: The extends keyword is used to create a subclass that inherits attributes and methods from a superclass.
implements: The implements keyword is used by a class to implement an interface.
interface: The interface keyword is used to declare an interface, which is a reference type similar to a class that can contain only constants, method signatures, default methods, static methods, and nested types.
abstract: The abstract keyword is used to declare an abstract class or method.
new: The new keyword is used to create new instances of classes.
this: The `this` keyword is a reference to the current object within a method or constructor.
super: The super keyword is a reference to the superclass of the current object.
try: Used to enclose the code that might throw exceptions.
catch: Used to handle exceptions that are thrown within the corresponding try block.
finally: An optional block used to execute code that should always run, regardless of whether an exception is thrown or caught.
throw: Used to explicitly throw an exception within a method.
throws: Used in method declarations to indicate that the method might throw certain types of exceptions.
public: The public modifier is an access modifier that makes the associated class, method, or variable accessible from any other class.
private: the private modifier is an access modifier that restricts access to the associated class member (method or variable) within the same class.
protected: The protected modifier is an access modifier that allows access to the associated class member within the same package or by subclasses (in any package).
static: The static modifier is used to create class-level members (methods and variables) that belong to the class rather than instances of the class.
final: The final modifier is used to indicate that the associated class, method, or variable cannot be subclassed, overridden, or reassigned, respectively.
abstract: The abstract modifier is used to declare abstract classes or methods.
synchronized: The synchronized modifier is used to control access to critical sections of code by allowing only one thread to execute the synchronized code block at a time.
volatile: The volatile modifier is used to indicate that a variable's value may be modified by multiple threads.
transient: The transient modifier is used to indicate that a variable should not be serialized during object serialization.
native: The native modifier is used to declare a method that is implemented in platform-dependent native code.
strictfp: The `strictfp` modifier is used to ensure that floating-point calculations in the associated class or method adhere to the IEEE 754 standard. It guarantees consistent floating-point calculations across different platforms.
package: It is used to declare a Java package, which is a way of organizing classes and interfaces into namespaces.
import: It makes classes and interfaces from another package accessible in the current source file.
void: The void keyword is used in method declarations to specify that the method does not return any value.
null: The null keyword defines a reference that does not refer to any object.
These keywords serve specific purposes within the Java language and are essential for defining the structure, behaviour, and control flow of Java programs.
It's important to note that Java is case-sensitive, so keywords must be used exactly as specified. Additionally, some keywords, such as true, false, and null, are literals rather than reserved words but still hold special significance in the language.