Question

In Java, I have an array of integers. Is there a quick way to convert them to a string?

I.E. int[] x = new int[] {3,4,5}
x toString() should yield “345”

Answer 1

Simplest performant approach is probably StringBuilder:

StringBuilder builder = new StringBuilder();
for (int i : array) {
  builder.append(i);
}
String text = builder.toString();

If you find yourself doing this in multiple places, you might want to look at Guava’s Joiner class – although I don’t believe you’ll be able to use it for primitive arrays. EDIT: As pointed out below, you can use Ints.join for this.