28/03/2023 12:49 pm
Topic starter
Notifications
Clear all
Students’s Forum
1
Posts
2
Users
0
Likes
640
Views
0
How to check if a string contains only digits?
1 Answer
0
29/03/2023 5:26 pm
class Test {
public static void main(String[] args) {
String str = "129843875";
boolean containsOnlyDigits = true;
for (int i = 0; i < str.length(); i++) {
if (!Character.isDigit(str.charAt(i))) { // in case that a char is NOT a digit, enter to the if code block
containsOnlyDigits = false;
break; // break the loop, since we found that this char is not a digit
}
}
if (containsOnlyDigits) {
System.out.println("String contains only digits!");
} else {
System.out.println("String does not contain only digits!");
}
}
}
Try the above code.
