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How to check if a given character is a number/letter in Java?
The Character class is a subclass of Object class and it wraps a value of the primitive type char in an object. An object of type Character contains a single field whose type is char. We can check whether the given character in a string is a number/letter by using isDigit() method of Character class. The isDigit() method is a static method and determines if the specified character is a digit.
Example
public class CharacterIsNumberOrDigitTest {
public static void main(String[] args) {
String str = "Tutorials123";
for(int i=0; i < str.length(); i++) {
Boolean flag = Character.isDigit(str.charAt(i));
if(flag) {
System.out.println("'"+ str.charAt(i)+"' is a number");
} else {
System.out.println("'"+ str.charAt(i)+"' is a letter");
}
}
}
}
Output
'T' is a letter 'u' is a letter 't' is a letter 'o' is a letter 'r' is a letter 'i' is a letter 'a' is a letter 'l' is a letter 's' is a letter '1' is a number '2' is a number '3' is a number
Updated on: 23-Nov-2023
39K+ Views
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