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How to check if a character is a digit in Java
okwudili onyejiaku
Overview
We can check if a character is a digit in Java without using any built-in method. A digit character is any numeric character from 0 and 9. The way to achieve this is by using an if-else condition.
Syntax
if(character <= '0' && character >= '9'){
// character is digit
}else{
// character is not digit
}Check if a character is a digit in Java
Parameter
character: This is the character that we're checking to see if it is a digit or not.
Code example
class HelloWorld {
// create function to check if digt
static void checkIfDigit(char character){
if (character >= '0' & character <= '9'){
System.out.println(character +" is digit");
}else{
System.out.println(character +" is not digit");
}
}
public static void main( String args[] ) {
// check if some characters are digits
checkIfDigit('e');
checkIfDigit('1');
checkIfDigit('3');
checkIfDigit('%');
checkIfDigit('4');
}
}Check if a character is a digit in Java
Explanation
In the code above:
- Line 3: We create a function to check if a character is a digit character. It takes a character as a parameter and applies the above condition.
- Lines 12–16: With the function we created, we check several characters to see if they are digits and print the results to the console.
RELATED TAGS
character
digit
java
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okwudili onyejiaku
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