HappyNumbers.java

importjava.util.*; 
importjava.io.*;

classMain {

publicstaticbooleanHappyNumbers(intnum) {
Stringstr = String.valueOf(num);
intsum = 0;
while (true) {
for (inti = 0; i < str.length(); i++) {
intn = Character.getNumericValue(str.charAt(i));
sum += (int)Math.pow(n, 2);
 }
str = String.valueOf(sum);
sum = 0;
if (str.equals("1")) 
returntrue;
elseif (str.length() == 1 && !str.equals("1"))
returnfalse;
 }
 }

publicstaticvoidmain (String[] args) {
// keep this function call here
Scanners = newScanner(System.in);
System.out.print(HappyNumbers(s.nextLine())); 
 }
}