The exam assumes you are well versed with this 8 datatypes and their relative sizes and what can be stored in them.
java has 8 datatypes
byte -> -128 to 127
don’t memorize the max. allowed or min.
you won’t convert b/w number systems on the exam.
you can add _ underscores b/w numbers except begin/end same in decimal ex. 1.1
defaults
numbers : int
decimals : double
int num = 1_234_567_890;
long longNum = 4_234_567_890L;
float f = 123.2f;
double d = 123.2;
cast or add litterals if initializing
Primitive types assign to null will give compile error
int num=null;
long distance=null;
float money=null;
double savings=null;