Get the last digit of a number in Java

In this tutorial, we are going to learn about how to get the last digit of a number in Java.

Get the last digit of a number

To get the last digit of a number, convert the number to a string and call the substring() method on it, by passing the last character index as a argument.

The substring() method returns the last character of a string then convert the result back to a number to get the last digit.

Note: string.length()-1 is the index of a last character.

Here is an example:

int price = 429;
String priceStr = Integer.toString(price);
int lastCharIndex = priceStr.length()-1; // last character index
int lastDigit = Integer.parseInt(priceStr.substring(lastCharIndex));
System.out.println(lastDigit);

Output:

9

In the example above, on the first step we have converted the number to a string using the Integer.toString() method.

We have passed the priceStr.length()-1 as argument to the substring() method, so it returns the last character.

The last step, we used the Integer.parseInt() method to convert it back to a number.

Note: Strings are sequence of characters, where indexes are zero-based. The last character is in position 0, the second in 1, and so on.

References

• Strings in Java

• Integers in Java