Arrays

Question 1

toString method

Answer 1

displays elements in array as a string saves having to iterate in a loop

Question 2

what type are arrays

Answer 2

arrays are objects so they are reference types

Question 3

position of an element is called

Answer 3

index or subscript

Question 4

What is different about using a for each instead of a for loop

Answer 4

the for each only lets you access the elements, not modify

Question 5

accessing an array program

Answer 5

a program refers to any of the the elements in the array with an array access expression

Question 6

where do arrays store length

Answer 6

in a length instance variable. accessed using array.length

Question 7

default values within arrays

Answer 7

if the element is
primitive - 0
boolean - false
reference - null.

Question 8

getting the length of a datatype

Answer 8

for arrays - .length this is an instance variable. this is because the length of an array cannot be altered, so it can be stored in a variable
for Strings - .length() this is a method of the string class because the length of a string can change so it must be recalculated if it is modified. BUT remember Strings can be stored inside of arrays