Keyword Java

Question 1

abstract

Answer 1

Specifies that a class or method will be implemented later, in a subclass.

Question 2

assert

Answer 2

Describes a predicate placed in a java program to indicate that the developer thinks that the predicate is always true at that place.

Question 3

boolean

Answer 3

A data type that can hold True and False values only.

Question 4

break

Answer 4

A control statement for breaking out of loops.

Question 5

byte

Answer 5

A data type that can hold 8-bit data values.

Question 6

case

Answer 6

Used in switch statement to mark blocks of text.

Question 7

catch

Answer 7

Catches exceptions generated by try statements.

Question 8

char

Answer 8

A data type that can hold unsigned 16-bit Unicode characters.

Question 9

class

Answer 9

Declares a new class.

Question 10

continue

Answer 10

Sends control back outside a loop.

Question 11

default

Answer 11

Specifies the default block of code in a switch statement.

Question 12

do

Answer 12

Starts a do-while loop.

Question 13

double

Answer 13

A data type that can hold 64-bit floating-point numbers.

Question 14

else

Answer 14

Indicates alternative branches in an if statement.

Question 15

enum

Answer 15

Used to declare an enumerated type. Enumerations extend the base class.

Question 16

extends

Answer 16

Indicates that a class is derived from another class or interface.

Question 17

final

Answer 17

Indicates that a variable holds a constant values or that a method will not be overridden.

Question 18

finally

Answer 18

Indicates a block of code in a try-catch structure that will always be executed.

Question 19

float

Answer 19

A data type that holds a 32-bit floating - point number.

Question 20

for

Answer 20

Used to start a for loop.

Question 21

if

Answer 21

Test a true/false expression and branches accordingly.

Question 22

implements

Answer 22

Specifies that a class implements an interface.

Question 23

import

Answer 23

References other classes.

Question 24

instanceof

Answer 24

Indicates whether an object is an instance of a specific class or implements an interface.

Question 25

int

Answer 25

A data type that can hold 32-bit signed integer.

Question 26

interface

Answer 26

Declares an interface.

Question 27

long

Answer 27

A data type that holds a 64-bit integer.

Question 28

native

Answer 28

Specifies that a method is implemented with native (platform-specific) code

Question 29

new

Answer 29

Creates new objects.

Question 30

null

Answer 30

This indicates that a reference does not refer to anything.

Question 31

package

Answer 31

Declares a Java package.

Question 32

private

Answer 32

An access specifier indicating that a method or variable may be accessed only in the class it’s declared in.

Question 33

protected

Answer 33

An access specifier indicating that a method or variable may only be accessed in the class it’s declared in.

Question 34

public

Answer 34

An access specifier used for classes, interfaces, methods, and variables indicating that an item is accessible throughout the application (or where the class that defines it is accessible)

Question 35

return

Answer 35

Sends control and possibly a return value back from a called method.

Question 36

short

Answer 36

A data type that can hold a 16-bit integer.

Question 37

static

Answer 37

Indicates that a variable or method is a class method, rather than being limited to one particular object.

Question 38

strictfp

Answer 38

A java keyword is used to restrict the precision and rounding of floating-point calculations to ensure portability.

Question 39

super

Answer 39

Refers to a class’s base class (used in a method or class constructor)

Question 40

switch

Answer 40

A statement that executes code based on a test value.

Question 41

synchronized

Answer 41

Specifies critical sections or methods in multithreaded code.

Question 42

this

Answer 42

Refers to the current object in a method or constructor.

Question 43

throw

Answer 43

Creates an exception

Question 44

throws

Answer 44

Indicates what exceptions may be thrown by a method.

Question 45

transient

Answer 45

Specifies that a variable is not part of an object’s persistent state.

Question 46

try

Answer 46

Starts a block of code that will be tested for exceptions.

Question 47

void

Answer 47

Specifies that a method does not have a return value.

Question 48

volatile

Answer 48

This indicates that a variable may change asynchronously.

Question 49

while

Answer 49

starts a while loop.