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i must say all characters except from 0-9/numbers should be invalid.

how can i declare that the value entered is invalid? it now can say ODD, NEGATIVE, EVEN, ZERO

import java.io.*;

public class A

{
public static void main (String arum[])throws IOException{...

hmmm.. i use this?

a=Integer.valueOf(String);

i cant help myself...

import java.io.*;

public class A

{
public static void main (String arum[])throws IOException{
BufferedReader tag=new BufferedReader (new InputStreamReader(System.in));