Access
We use the variable name and [] to access elements in an array, and tell Java which element inside the [].
Reading a Value from an Array¶
int first = scores[0]; // Remember that the first index is 0.
0 and stores it in the variable first.
Storing a Value in an Array Position¶
Storing into an array position is the reverse of reading. * We use the variable name and index, and assign a value to that slot.
scores[0] = 96;
scores[1] = 82;
Practice Exercise¶
Because the first index is always 0, the last index is one less than the length of the array.
Trying to assign a value beyond the end of an array causes a catastrophic error in most languages.
int[] scores = new int[7];
scores[7] = 41; // No such element!
Drill¶
Arrays/src/drills/ArrayAccess.java
* Store the name of each weekday at the correct index.
* Store the grade A in the FIRST index of the array, and C in the LAST index of the array.
* Run the program and check the output to see if you were correct.
Practice Exercise¶
The array operator has the highest precedence. That means when Java sees you are trying to read from an array, it will try to determine the array index before even looking at the array itself.