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How to find If a given String contains only letters in Java?
To verify whether a given String contains only characters −
- Read the String.
- Convert all the characters in the given String to lower case using the toLower() method.
- Convert it into a character array using the toCharArray() method of the String class.
- Find whether every character in the array is in between a and z, if not, return false.
Example
Following Java program accepts a String from the user and displays whether it is valid or not.
import java.util.Scanner;
public class StringValidation{
public boolean validtaeString(String str) {
str = str.toLowerCase();
char[] charArray = str.toCharArray();
for (int i = 0; i < charArray.length; i++) {
char ch = charArray[i];
if (!(ch >= 'a' && ch <= 'z')) {
return false;
}
}
return true;
}
public static void main(String args[]) {
Scanner sc= new Scanner(System.in);
System.out.println("Enter a string value: ");
String str = sc.next();
StringValidation obj = new StringValidation();
boolean bool = obj.validtaeString(str);
if(!bool) {
System.out.println("Given String is invalid");
}else{
System.out.println("Given String is valid");
}
}
}Output
Enter a string value: 24ABCjhon Given String is invalid
Updated on: 07-Aug-2019
2K+ Views
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