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AP Exam Important Topics to Review · Created by Dylan T (2021) Variables · primitive vs non-primitive · object variables ·
the this keyword and how to use it ·
declaration vs
instantiation ·
= vs == ·
name reflects purpose ·
static vs instance ·
type casting ie: (int) (double) ·
char ·
int vs long ·
float vs double ·
min and max range for
int Methods ·
function = static method ·
static vs instance ·
serves one purpose ·
return types ·
abstract ·
return value must be
initialized ·
parameters provide
information to be used (in the exam) ·
name reflects meaning ·
overloading ·
formal vs informal
parameters ·
recursion ·
pre-conditions Arraylists ·
dynamic size ·
<typed> ·
key methods: get, set,
add, remove, size ·
import java.util.ArrayList ·
wrapper classes ·
sequential searching
vs binary searching Arrays ·
fixed size (static
size) ·
1D vs 2D ·
nested loops for 2D
processing ·
how to get length of
rows and cols ·
[based] ·
.length ·
row:col order ·
sequential searching
vs binary searching Boolean logic ·
! means not ·
|| means or ·
&& means and ·
DeMorgan’s
Law: ! (A
&& B) is same as !A || !B ·
DeMorgan’s
Law: ! (A ||
B) is same as !A && !B Strings ·
cannot be changed (immutable) ·
manipulation ·
inherits object
methods ·
.length() ·
.equals vs == ·
indexOf() ·
substring(#) vs substring(#,#) ·
compareTo ·
toUpperCase() and toLowerCase() Sorting ·
when to use each ·
merged sorting ·
selection sorting ·
insertion sorting ·
comparable interface ·
Arrays.sort() <can we use this?> Loops ·
while ·
for ·
for each Exceptions ·
Nullpointer ·
Arithmetic ·
OutOfBounds ·
IllegalArgument Classes (OOP) ·
Instance variables (datafields) ·
Constructors ·
Instance methods ·
Inheritance (extends
keyword) ·
Subclass ·
Superclass ·
Aggregation ·
Abstract ·
Data encapsulation ·
Interface (implements
keyword) ·
Polymorphism
·
Math.abs ·
Math.pow ·
Math.sqrt ·
Math.random ·
/ used for integer
division vs normal division ·
Symbols: += /= -=
*= %= · ++ and -- NO’s ·
[] vs <> ·
Never output anything
to screen (system.out.print / system.out.println) ·
No return in
void/constructors Extra ·
@param ·
@return Thank you to Dylan T for creating and sharing this
resource. |