Check if string is numbe

[carman12]

Hey all, i've been trying to work some magic here but no such luck. I have a method that tests user input for space, however i'd like to enable a test also should user input a number.

I saw some methods online using try catch, but i'm hoping I can get one excluding try catch.

Below is a snippet of my code testing whether user entered a space or hit enter key.

public static boolean isFamName(String b){
		if(b.length()==0||b==("")){
		System.out.println("Please enter your family name correctly?");
			return false;
		}else{
			return true;
		}//close if-else statement
	}//close isFamName

[Iron Lion]

Same problem as this one.

[Junky]

:confused:

Title says to check is String contains a number, yet posted code has nothing to do with it.

Method is called isFamName, yet all it does is check if string length is greater than 0.

The b == "" check is pointless! If the String has a zero length then it must be "". So either both conditions are true or both conditions are false.

The b == "" check is wrong as you should use the equals method instead.

Below is a snippet of my code testing whether user entered a space

It does no such thing.

[CTheSky]

Hi,

Do you get the answer already?

Or you can try in such way :

public static boolean isFamName(String b){
if(b.length()==0||b==null){
System.out.println("Please enter your family name correctly?");
return false;
}else{
return true;
}//close if-else statement
}//close isFamName

And since when user input String b is empty, then you will println to user to key in family name correctly and also return false, so you must call this method properly, either is if( ! isFamName){ ... } or if( isFamName){ ... }, depends on your situation you want to apply.

Thanks.