String, StringBuilder, Arrays & ArrayList

Question 1

Can the size of an array be specified when it is declared?

Answer 1

No. The size of the array comes from the initialisation on the right hand side of the assignment.

Question 2

Can an array be initialised and have space explicitly assigned?

Answer 2

No. This will not compile if you try to initialise the array and explicitly create space as part of the initialisation of the array.

Question 3

Describe all String methods and their nuansances

Answer 3

charAt()
concat()
equalsIgnoreCase()
length()
replace()
substring()
toLowerCase()
toString()
toUpperCase()
trim()

Question 4

Describe the substring method on String

Answer 4

Arrays are indexed beginning at 0 and when you substring them the second parameter is not indexed at position 0. No second parameter will substring to the end of the String object.

Question 5

Describe the trim method on String

Answer 5

trims BOTH trailing and leading white space.