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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
Updated on 26-Jun-2020 12:13:37
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