1. int to String
int x = 123;
String string = String.valueOf(x);
2.String to char[]
char[] xString = string.toCharArray();
3.char[] to List<Character>
using loop to add each one
4. List<Character> to char[]
using loop to add each one
5.char[] to String
char[] finalCharArray = new char[5];
String stringNew = String.valueOf(finalCharArray);
Attention:
6.String to int
int result = Integer.parseInt(stringNew);