Best way to convert an array of integers to a string in Java

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

StringBuffer str =new StringBuffer();
for(int i:x){  
str.append(i);
}  

You need to read all once at least.

Answer 2

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.

Answer 3

Try with this - you have to import java.util.Arrays and then -

String temp = Arrays.toString( intArray ).replace(", ", "");
String finalStr = temp.substring(1, temp.length()-2);

Where intArray is your integer array.

Answer 4

   int[] x = new int[] {3,4,5};
   String s = java.util.Arrays.toString(x).replaceAll("[\\,\\[\\]\\ ]", "")