I want to get the last three characters of a String . Example:
String x = "OlaMundo"
Output:
ndo
I can even do this using substring , the problem is that I do not know the size of String , I do not know what the word is.
Is there any way to do this without knowing the specific size of String ?
If you do not want to worry about doing string size validation, you can use the class StringUtils of package import org.apache.commons.lang3.StringUtils; ( library link ), would look like this:
String x = StringUtils.right("MinhaString", 3);
The most basic way would be by taking the size:
x.substring(x.length() - 3);
The only problem is if the string is less than 3, then it would have to check first. If you use it that way is simpler than using a library. If you want to do the treatment I advise you to create a function, like this:
class Program {
public static void main (String[] args) {
System.out.println(Right("OlaMundo", 3));
}
public static String Right(String text, int length) {
if (text.length() <= length) return null;
return text.substring(text.length() - length);
}
}
See running on ideone . And no Coding Ground . Also I put it in GitHub for future reference .
You can get the size of it using
suaString.substring(suaString.length() - 3);
You will only have problems if your String is less than three characters long.
As the .length() method returns a number (integer type), you can do something of the type so you can compare before using:
if (suaString.length() >= 3) {
//Implanta o código
} else {
System.out.println("Sua String é menor que três caracteres!")
}