public class ReverseNumber { public static void main(String[] args) { int num = 1234, reversed = 0; while(num != 0) { int digit = num % 10; reversed = reversed * 10 + digit; num = num / 10; } System.out.println("Reversed Number: " + reversed); }}
List<String> stringList = Arrays.asList("A", "B", "C"); Collections.reverse(stringList); assertThat(stringList).containsExactly("C", "B", "A");
while(num != 0) { int digit = num % 10; reversed = reversed * 10 + digit; num /= 10; }