Java Keywords and reserved words - NareshIT

Like all the programming languages in Java the keywords come predefined, and they have a unique meaning. We also know them as the reserved keywords, and we cannot apply them to denote a variable or any of the identifiers or any method, or any class. Java has around 57 reserved keywords. There is a huge collection of keywords, and some of them have been abandoned, and are not used anymore. In this article, we discuss all the Java keywords in deep. Let’s dive deep and try to find the in-depth details of each Java keyword. And you can contact us for your Java training. Naresh I Technologies is the number one computer training institute in Hyderabad and among the top five computer training institutes in India. Contact us anytime for your Java training. ?

abstract

We declare an abstract class using this keyword. And an abstract class can have the abstract as well as the non-abstract methods. And these are the methods with the body.

for

For is a type of iteration, that has an initialization, a Boolean expression, an increment, or a decrement expression. A block of statements is repeatedly executed based on these three inputs for iteration. And you can also call it the for a loop. The same keyword is used for representing the enhanced for or for each loop as well. And these are the only two conditions when the keyword is being used.

continue

You can make use of the continue within the loop body only. And this gets executed, the ongoing iteration terminates, though the execution of the loop continues after that iteration.? You can use continue hence to skip certain iterations in a loop.

new

This is applied for the creation of an instance of a class, or creation of an object.?

default

This is applied in the switch statement to execute a block of code in the loop.

switch

This is applied for the execution of a statement when that matches with a certain case. There are multiple numbers of cases in a switch and one default case.

assert

This keyword was added in the 1.4 version. And it explains a predicate which is true or false for letting the developers feel it’s in all the cases is true. If it turns out to be false at run time then the execution aborts.

goto

This comes with no function, and the Java programming language does not support it anymore.

synchronized

The synchronized blocks are being marked by the Synchronized keyword. And the block synchronizes to some object. And all the blocks get synchronized on one object has one thread executing within them at one time.

package

This is used for grouping the same type of classes, subclasses, interfaces, and various subclasses which are together based on one functionality.

boolean

We can set these to true or false and as we like.

do

This is a control statement, and we use de while to iterate a block of a statement based on a set condition, and till it is satisfied.

if

We make use of this for testing an expression and executing a block of a statement based on the condition set by if. We also make use of it in the case of the if-else statement in Java. And we use it inside the if-else if ladder as well.

private

This is one of the access modifiers, and we use it to declare the methods and the data members as private. And when we do that hen that member is only accessible from within the class, where it has been declared.

this

It’s the keyword in Java that is used for representing the present instance of the class. We mainly use it for accessing other members that are members of the same class.

double

We declare a variable as double to represent the 64-bit double floating-point numbers.

implements

This is used for implementing an interface through a class.

protected

If a method or the data member is declared as private then it's only accessible inside that class or the package.

byte

This is applied to creating and throwing an exception.

else

This is applied for setting a condition that is in contradiction to the if condition.

import

This is used at the start for importing various libraries, classes, and methods.

throws

This is applied for declaring a method that specifies the exception which cannot be handled through a method.

case

This is applied inside the switch statements to represent each case inside the switch conditional statement.

enum

This was added in Java 5.0 and is used for enumeration purposes.

instanceof

This returns a true if and only when the runtime object type is interface or class compatible.

return

This is applied for completing the method execution. And it returns a value that is calculated by the method.

catch

We make use of the catch block got forming a catch block, and an exception is based on the catch block is generated in the try block.

extends

This indicates that the class is extending its immediate class.

transient

We declare an instance field through this, and that is not the part of the serialized form of an object that is the default.

int

This happens to be the data type that can hold a signed integer of 32 bit.

short

This is the data type that holds an integer of 16 bit.

try

We test a code block through try for an exception.

char

This holds a 16-bit unsigned integer and is a data type.

final

This is an entity that once declared as the final cannot change nor can be derived from the well along.

interface

This happens to be the Java that is being referred to as the abstract data type, and it leverages the Java collection to manipulate without any help through the representation detail.

static

The static keyword is used for memory management . And we use it with any variable, blocks, nested classes, or the blocks.

void

If a method returns a null value then we place the void keyword ahead of that method name in the declaration.

class

This is used for the creation of the new class, and we create an object with the help of it.

long

This is the data type that holds an integer value of 64 bit

finally

This means that a code block through exception handling is always executed.

volatile

This means that the variable can change asynchronously.

strictfp

This was added in the 1.2 version.

float

It’s the data type that holds a floating-point number that is as large as 32 bit.

native

This means that the method declaration is to be made from platform-dependent native code.

super

This refers to the members like method, variables, or the constructors of the superclass.

while

This is used to make the while loop. And we use it for iterating the code block repeatedly if the iteration count is not fixed.?

And with that, we come to the end of our article on the reserved keywords. Hope you now know all the keywords discussed above. Happy coding!

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FAQ'S

1. What are Java Keywords?

Java keywords are reserved words that have special meanings in the Java programming language. They are used to define the structure and syntax of the language. Keywords cannot be used as identifiers for variables, methods, or classes.

2. What are some common Java keywords?

Some common Java keywords include:

• Data types: int, double, boolean, char, String, etc.
• Control flow: if, else, for, while, do-while, switch, case, default
• Access modifiers: public, private, protected
• Class and object-oriented keywords: class, interface, abstract, extends, implements, new, this, super
• Exception handling: try, catch, finally, throw, throws

3. Can I use keywords as variable or method names?

No, you cannot use keywords as variable or method names in Java. Doing so will result in a compilation error. It's important to remember that keywords are reserved for specific purposes within the language and cannot be redefined.

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