Reserved Keywords

Question 1

abstract

Answer 1

a non-access modifer. Used for classes and methods: an abstract class cannot be used to create objects -> (Must be inherited from another class). An abstract method can only be used in an abstract class, and it does not have a body. The body is provided by the subclass.

Question 2

assert

Answer 2

For debugging -> used to verify that a certain assumption about the program is true. (assert (i == 0))

Question 3

break

Answer 3

used to break out of a loop or switch block

Question 4

case

Answer 4

Marks a block of code in switch statement

Question 5

catch

Answer 5

Catches exceptions generated by try statements

Question 6

class

Answer 6

Defines a class

Question 7

continue

Answer 7

Continues to next iteration of a loop

Question 8

final

Answer 8

Defines a constant -> value is non-changeable, impossible to inherit or override

Question 9

default

Answer 9

Specifies the default block of code in a switch

statement

Question 10

do

Answer 10

Used together with while to create a do-while loop

Question 11

else

Answer 11

used in conditional statements

Question 12

exports

Answer 12

Exports a package with a module

Question 13

extends

Answer 13

Extend from parent class

Question 14

finally

Answer 14

Used with exceptions, block of code that will be executed no matter if there is an exception or not

Question 15

implements

Answer 15

implements an interface

Question 16

import

Answer 16

used to import a package, class or interface

Question 17

instanceof

Answer 17

Checks whether an object is an instance of a specific class or an interface

Question 18

native

Answer 18

Specifies that a method is not implemented in the same Java source file (but in another language)

Question 19

new

Answer 19

Creates new objects

Question 20

module

Answer 20

Declares a module

Question 21

package

Answer 21

declares a package (Basically a folder used to group classes)

Question 22

private

Answer 22

access modifier used for attributes, methods and constructors, making them only accessible within the declared class

Question 23

protected

Answer 23

an access modifier used for attributes methods and constructors, making them accessible in the same package and subclasses

Question 24

public

Answer 24

access modifier used for classes, attributes, methods and constructors making them accessible by any other class

Question 25

requires

Answer 25

Specifies required libraries inside a module

Question 26

return

Answer 26

Finished the execution of a method, and can be used to return a value from a method

Question 27

static

Answer 27

non-access modifier used for methods and attributes, static methods/attributes can be accessed without creating an object of a class

Question 28

strictfp

Answer 28

restrict the precision and rouding of floating point calculations

Question 29

super

Answer 29

refers to superclass (parent) objects

Question 30

switch

Answer 30

selects one of many code blocks to be executed

Question 31

synchronized

Answer 31

a non access modifier, rwhich specifies that methods can only be accessed by one thread at a time

Question 32

this

Answer 32

refers to the current object in a method or constructor

Question 33

throw

Answer 33

creates a custom error

Question 34

throws

Answer 34

indicates what exceptions may be thrown by a method

Question 35

transient

Answer 35

a non-access modifer which specifies that an attribute is not part of an object's persistent state

Question 36

try

Answer 36

creates a try/catch statement

Question 37

void

Answer 37

specifies that a method should not have a return value

Question 38

volatile

Answer 38

indicates that an attribute is not cached thread-locally, and is always read from the "main memory"