Kaplan Self Test Notes

Question 1

Can implemented methods change the return type?

Answer 1

No

Question 2

What are bytes initialised by?

Answer 2

0b

Question 3

What can be expected with varargs (…)?

Answer 3

Nothing to the biggest array ever

Question 4

What kind of exception is a ClassNotFoundException?

Answer 4

A checked exception

Question 5

How much you ensure a float is designed when passing a value?

Answer 5

A whole number with nothing special

Or with f attached to the end of a decimal value

Question 6

What kinda of exception is an IOException?

Answer 6

A checked exception

Question 7

What are exceptions?

Answer 7

Exceptions are used to group and differentiate between different error types

Question 8

What do normal break statements break?

Answer 8

Inner most iterative blocks

Question 9

Can break statements break if statements?

Answer 9

No

Question 10

Does String have replace method?

Answer 10

Yes.

string1.replace(“Dog”, “Cat”);

Question 11

When running a java source file, what is the starting command, java or javac?

Answer 11

java

Question 12

Can final classes be subclassed?

Answer 12

No

Question 13

What determines which members are accessible?

Answer 13

Reference types

Question 14

Where do methods get called from?

Answer 14

The object

Question 15

Are you required to catch IllegalArgumentExceptions?

Answer 15

No, they are a subclass of RuntimeException

Question 16

What must you ensure when returning an array?

Answer 16

Return a clone and not the actual reference to the whole array

Question 17

How do you access the sixth value in an array and then in an ArrayList?

Answer 17

arrayName[6];

arrayListName.get(6);

Question 18

Are you required to catch UnsupportedOperationException?

Answer 18

No, it is a subclass of RuntimeException

Question 19

What does this mean?

? 1:0

Answer 19

Will return either 1 for true or 0 for false

Question 20

Can a default constructor be overloaded in the same class?

Answer 20

No, that makes no sense

Question 21

Can a default constructor be overloaded by the subclass?

Answer 21

Yes

Question 22

What determines how methods are called?

Answer 22

Objects

Question 23

Which requires less low-level implementation - arrays or arraylists?

Answer 23

ArrayLists

Question 24

What is the same for both Strings and Integers that makes passing and returning something to watch out for?

Answer 24

Both are immutable

Question 25

What is the default size of StringBuilder?

Answer 25

16

Question 26

What happens to the size of a StringBuilder object if it is created with a string of size 10.

Answer 26

Size expands to 26: default 16 plus 10