Programming duh

Question 1

a completely “abstract class” that is used to group related methods with empty bodies

Answer 1

interface

Question 2

process of hiding certain details and showing only essential information to the user.

Answer 2

Data abstraction

Question 3

is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class).

Answer 3

Abstract class

Question 4

can only be used in an abstract class, and it does not have a body. The body is provided by the subclass (inherited from).

Answer 4

Abstract method

Question 5

non-access modifier, used for classes and methods.

Answer 5

abstract keyword

Question 6

maintains an internal buffer of 8192 characters.

Answer 6

BufferedReader

Question 7

Occurs when a numeric calculation goes wrong

Answer 7

ArithmeticError

Question 8

Occurs when trying to access an index number that does not exist in an array

Answer 8

ArrayIndexOutOfBoundsException

Question 9

Occurs when a class file cannot be accessed

Answer 9

ClassFormatError

Question 10

Occurs when trying to access a class that does not exist

Answer 10

ClassNotFoundException

Question 11

Occurs when an element is added or removed from iterables

Answer 11

ConcurrentModificationException

Question 12

Occurs when a file cannot be accessed

Answer 12

FileNotFoundException

Question 13

Occurs when there’s been a change in a base class after a child class has already been initialized

Answer 13

IncompatibleClassChangeError

Question 14

Occurs when entering wrong input (e.g. text in a numerical input)

Answer 14

InputMismatchException

Question 15

Occurs when a Thread is interrupted while waiting/sleeping

Answer 15

InterruptedException

Question 16

Occurs when the Serialization runtime observes a problem with a class

Answer 16

InvalidClassException

Question 17

Occurs when an input or output operation fails

Answer 17

IOException

Question 18

Occurs when trying to create an array with negative size

Answer 18

NegativeArraySizeException

Question 19

Occurs when the class is not found at runtime

Answer 19

NoClassDefFoundError

Question 20

Occurs when trying to access a class field/variable that does not exist

Answer 20

NoSuchFieldException

Question 21

Occurs when trying to access a class method that does not exist

Answer 21

NoSuchMethodException

Question 22

Occurs when trying to access an object referece that is null

Answer 22

NullPointerException

Question 23

Occurs when it is not possible to convert a specified string to a numeric type

Answer 23

NumberFormatException

Question 24

Occurs when an exception occurs at runtime

Answer 24

RuntimeException

Question 25

Occurs when trying to access a character in a String that does not exist

Answer 25

StringIndexOutOfBoundsException

Question 26

Occurs when a type cannot be found

Answer 26

TypeNotPresentException

Question 27

Occurs when when an illegal argument is passed to a method

Answer 27

IllegalArgumentException

Question 28

Occurs when when a method is called at an illegal time

Answer 28

IllegalStateException

Question 29

lass of the java.io package can be used to read data (in characters) from files.

Answer 29

FileReader