Unit 2 (Strings and Classes)

Question 1

array definition

Answer 1

int[] num = new int[length];
int [] num = {1, 2, 3, 4, 5};
Arrays are fixed in length

Question 1

2d array definition

Answer 1

int[][] matrix = {
{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12}
};

int[][] jagged = new int[3][];
jagged[0] = new int[2];
jagged[1] = new int[4];
jagged[2] = new int[1];

Question 2

order of operations

Answer 2

() []
++, –
% / *
+, -
< > <= >=
== !=
&&
||
= += -= etc

Question 3

When to use .length vs .length()

Answer 3

.length for arrays
.length() for strings

Question 4

The size of an array is immutable. You cannot ever change the size of an array

Answer 4

Check the answers when tracing to eliminate any options with changed array length

Question 5

when iterating thru a array, what is the iteration

Answer 5

(int x: arr){
}

Question 6

when iterating thru a 2d array, what is the iteration