Determine numeric and replace it

Question

How to determine whether a string is numeric or not?
And what is the Replace function in Java?, i need to replace the character "Not Numeric" which "", thanks.

Answer 1

Hi.
I have written the following piece of code to determine whether the string contains numeric or only letters.
Save the following program into a file called testStringNumeric.java and execute. Type exit to quit.
For any suggestions please mail to [email protected]
Thanks and Regards
Soumya Mitra
import java.io.*;
public class testStringNumeric
public static boolean checkString(String var)
boolean status = true;
int i = 0;
while(i < var.length())
if (Character.isLetter(var.charAt(i)) == false)
status = false;
break;
i = i + 1;
return status;
public static void main(String[] args) throws Exception
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
StringBuffer str = new StringBuffer();
String inStr;
String temp;
try
while ((inStr = in.readLine()) != null)
str.append(inStr);
temp = str.toString();
if (checkString(temp) == true)
System.out.println("String contains letters only");
else
System.out.println("String contains digits. Not contain only letters.");
System.out.flush();
if (temp.equalsIgnoreCase("exit"))
in.close();
break;
str.setLength(0);
} // end of while
catch(Exception excep)
excep.printStackTrace();
}