Java Keywords
Java Keywords
Java keywords are also known as reserved words. Keywords are particular words that act as a key to a code. These are predefined words by Java so they cannot be used as a variable or object name or class name.
List of Java Keywords
A list of Java keywords or reserved words are given below:
- abstract:Java abstract keyword 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: ava 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 the loop or switch statement. It breaks the current flow of the program at specified conditions.
- byte:Java byte keyword is used to declare a variable that can hold 8-bit data values.
- case:Java case keyword is used 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: ava 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.
- 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 the 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 64-bit floating-point number.
- 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 in
- final:Java final keyword 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.
- finally:Java finally keyword indicates a block of code in a try-catch structure. This block is always executed whether an 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 condition becomes 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 the 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:ava 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 the package and outside the package but through inheritance only. It can't be applied with 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 mainly used for memory management.
- strictfp:Java strictfp is used to restrict the floating-point calculations to ensure portability.
- super: Java super keyword 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 Java 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.
- synchronized:Java synchronized keyword is used to specify the critical sections or methods in multithreaded code.
