Relooping through array

Question

So let's say I have an array of length 5 (let's just call it myArray[5]). If I add 4 to myArray[3], such like myArray[3+4], how can I make it loop through myArray again so that it becomes myArray[2]?

example)

myArray[3]

myArray[4]   //+1

myArray[0]   //+2

myArray[1]   //+3

myArray[2]   //+4

Answer 1

Just use the array length for a modulo operation:

int index = /* index you are using */;
myArray[index % myArray.length]

Answer 2

You can use modulus. index % myArray.length like

int[] myArray = new int[10];
for (int i = 10; i < 20; i++) {
    System.out.println(i % myArray.length);
}

Output is 0 - 9 (inclusive).