Java Program to check whether the entered character a digit, white space, lower case or upper case character

To check whether the entered character is a digit, whitespace, lowercase or uppercase, you need to check for the ASCII values.

Let’s say we have a value in variable “val”, which is to be checked.

For Lower Case.

if(val >= 97 && val <= 123) {
   System.out.println("Lower Case");
}

For Upper Case

else if(val >= 65 && val <= 96) {
   System.out.println("Upper Case");
}

For Digit

else if(val >= 48 && val <= 57) {
   System.out.println("Digit");
}

Check for Whitespace now

else if(Character.isWhitespace(val)) {
   System.out.println("Whitespace");
}

The following is the complete example.

Example

public class Demo {
   public static void main(String []args) {
      char val ='L';
      System.out.println("Given Value: "+val);
      if(val >= 97 && val <= 123) {
         System.out.println("Lower Case");
      } else if(val >= 65 && val <= 96) {
         System.out.println("Upper Case");
      } else if(val >= 48 && val <= 57) {
         System.out.println("Digit");
      } else if(Character.isWhitespace(val)) {
         System.out.println("Whitespace");
      }
   }
}

Output

Given Value: L
Upper Case

Let us see another example.

Example

public class Demo {
   public static void main(String []args) {
      char val ='L';
      System.out.println("Given Value: "+val);
      if(val >= 97 && val <= 123) {
         System.out.println("Lower Case");
      } else if(val >= 65 && val <= 96) {
         System.out.println("Upper Case");
      } else if(val >= 48 && val <= 57) {
         System.out.println("Digit");
      } else if(Character.isWhitespace(val)) {
         System.out.println("Whitespace");
      }
   }
}

Output

Given Value: a
Lower Case