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
Just use the array length for a modulo operation:
int index = /* index you are using */;
myArray[index % myArray.length]
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).
If you want to loop through the array in a circular fashion the modulus % operator is the way to go. If you combine that with the Java 8 streaming API:s the solution can look like this.
int[] myArray = {1, 2, 3, 4, 5}; // Setup the array
int startIndex = 3; // Start index as per the OP's example
int addIndex = 4; // Add as per the OP's example
// Loop via streams - no external looping
IntStream.range(startIndex, startIndex + addIndex)
.map(i -> myArray[i % myArray.length]) // circular loop
.forEach(System.out::println /* Do your stuff */); // do your stuff
For more examples, see this answer
