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List of JAVA keyword


List of Java keywords (reserved words)

abstractIt is used to declare an abstract class. An abstract class can provide the implementation of the interface. It can have abstract and non-abstract methods.
boolean It is used to declare a variable as a boolean type. It can hold True and False values only.
breakIt is used to break the loop or switch statement. It breaks the current flow of the program at specified conditions.
byteIt is used to declare a variable that can hold 8-bit data values.
caseIt is used with the switch statements to mark blocks of text.
catchIt is used to catch the exceptions generated by try statements. It must be used after the try block only.
charIt is used to declare a variable that can hold unsigned 16-bit Unicode characters.
classIt is used to declare a class.
continueIt is used to continue the loop. It continues the current flow of the program and skips the remaining code at the specified condition.
defaultIt is used to specify the default block of code in a switch statement.
doIt is used in the control statement to declare a loop. It can iterate a part of the program several times.
doubleIt is used to declare a variable that can hold 64-bit floating-point number.
elseIt is used to indicate the alternative branches in an if statement.
enumIt is used to define a fixed set of constants. Enum constructors are always private or default.
extendsIt is used to indicate that a class is derived from another class or interface.
finalIt is used to indicate that a variable holds a constant value. It is used with a variable. It is used to restrict the user from updating the value of the variable.
finallyIt indicates a block of code in a try-catch structure. This block is always executed whether an exception is handled or not.
floatIt is used to declare a variable that can hold a 32-bit floating-point number.
forIt is used to start a for loop. It is used to execute a set of instructions/functions repeatedly when some condition becomes true. If the number of iteration is fixed, it is recommended to use for loop.
if The if keyword tests the condition. It executes the if block if the condition is true.
implementsIt is used to implement an interface.
importThe import keyword makes classes and interfaces available and accessible to the current source code.
instanceofIt is used to test whether the object is an instance of the specified class or implements an interface.
intIt is used to declare a variable that can hold a 32-bit signed integer.
interfaceIt is used to declare an interface. It can have only abstract methods.
longIt is used to declare a variable that can hold a 64-bit integer.
nativeIt is used to specify that a method is implemented in native code using JNI (Java Native Interface).
newIt is used to create new objects.
nullIt is used to indicate that a reference does not refer to anything. It removes the garbage value.
packageIt is used to declare a Java package that includes the classes.
privateIt 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.
protectedIt is an access modifier. It can be accessible within the package and outside the package but through inheritance only. It can't be applied with the class.
publicIt is an access modifier. It is used to indicate that an item is accessible anywhere. It has the widest scope among all other modifiers.
returnIt is used to return from a method when its execution is complete.
shortIt is used to declare a variable that can hold a 16-bit integer.
staticIt is used to indicate that a variable or method is a class method. The static keyword in Java is mainly used for memory management.
strictfpIt is used to restrict the floating-point calculations to ensure portability.
superIt is a reference variable that is used to refer to parent class objects. It can be used to invoke the immediate parent class method.
switch The switch keyword contains a switch statement that executes code based on test value. The switch statement tests the equality of a variable against multiple values.
synchronizedIt is used to specify the critical sections or methods in multithreaded code.
thisthis can be used to refer the current object in a method or constructor.
throwIt is used to explicitly throw an exception. The throw keyword is mainly used to throw custom exceptions. It is followed by an instance.
throwsIt is used to declare an exception. Checked exceptions can be propagated with throws.
transientIt is used in serialization. If you define any data member as transient, it will not be serialized.
tryIt is used to start a block of code that will be tested for exceptions. The try block must be followed by either catch or finally block.
voidIt is used to specify that a method does not have a return value.
volatileIt is used to indicate that a variable may change asynchronously.
whileIt is used to start a while loop. This loop iterates a part of the program several times. If the number of iteration is not fixed, it is recommended to use the while loop.

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