Keywords in Java - Java Tutorial - Beginner to advance - Part 04 - A to Z Java Tutorial
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Java Tutorial - Beginner to advance - Part 4
In this video, we will learn about all keywords in java.
Their are total 48 keywords in Java
abstract: Java abstract keyword is used to declare abstract class. Abstract class can provide the implementation of interface. It can have abstract and non-abstract methods.
boolean: Java boolean keyword is used to declare a variable as a boolean type. It can hold True and False values only.
break: Java break keyword is used to break loop or switch statement. It breaks the current flow of the program at specified condition.
byte: Java byte keyword is used to declare a variable that can hold an 8-bit data values.
case: Java case keyword is used to with the switch statements to mark blocks of text.
catch: Java catch keyword is used to catch the exceptions generated by try statements. It must be used after the try block only.
char: Java char keyword is used to declare a variable that can hold unsigned 16-bit Unicode characters
class: Java class keyword is used to declare a class.
continue: Java continue keyword is used to continue the loop. It continues the current flow of the program and skips the remaining code at the specified condition.
default: Java default keyword is used to specify the default block of code in a switch statement.
do: Java do keyword is used in control statement to declare a loop. It can iterate a part of the program several times.
double: Java double keyword is used to declare a variable that can hold a 64-bit floating-point numbers.
else: Java else keyword is used to indicate the alternative branches in an if statement.
enum: Java enum keyword is used to define a fixed set of constants. Enum constructors are always private or default.
extends: Java extends keyword is used to indicate that a class is derived from another class or interface.
final: Java final keyword is used to indicate that a variable holds a constant value. It is applied with a variable. It is used to restrict the user.
finally: Java finally keyword indicates a block of code in a try-catch structure. This block is always executed whether exception is handled or not.
float: Java float keyword is used to declare a variable that can hold a 32-bit floating-point number.
for: Java for keyword is used to start a for loop. It is used to execute a set of instructions/functions repeatedly when some conditions become true. If the number of iteration is fixed, it is recommended to use for loop.
if: Java if keyword tests the condition. It executes the if block if condition is true.
implements: Java implements keyword is used to implement an interface.
import: Java import keyword makes classes and interfaces available and accessible to the current source code.
instanceof: Java instanceof keyword is used to test whether the object is an instance of the specified class or implements an interface.
int: Java int keyword is used to declare a variable that can hold a 32-bit signed integer.
interface: Java interface keyword is used to declare an interface. It can have only abstract methods.
long: Java long keyword is used to declare a variable that can hold a 64-bit integer.
native: Java native keyword is used to specify that a method is implemented in native code using JNI (Java Native Interface).
new: Java new keyword is used to create new objects.
null: Java null keyword is used to indicate that a reference does not refer to anything. It removes the garbage value.
package: Java package keyword is used to declare a Java package that includes the classes.
private: Java private keyword is an access modifier. It is used to indicate that a method or variable may be accessed only in the class in which it is declared.
protected: Java protected keyword is an access modifier. It can be accessible within package and outside the package but through inheritance only. It can't be applied on the class.
public: Java public keyword is an access modifier. It is used to indicate that an item is accessible anywhere. It has the widest scope among all other modifiers.
return: Java return keyword is used to return from a method when its execution is complete.
short: Java short keyword is used to declare a variable that can hold a 16-bit integer.
static: Java static keyword is used to indicate that a variable or method is a class method. The static keyword in Java is used for memory management mainly.
strictfp: Java strictfp is used to restrict the floating-point calculations to ensure portability.
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