java program tell number is positive or negative

write a program that calculate that tell number is positive or negative
public class posiNeg
{
  public static void main(String args[])
{
   int num ;
if(num>0)
System.out.println("Number is positive "+num);
else if(num<0)
System.out.println("Number is ngitive "+num);
else
System.out.println("Number is Zero ");
}}