What is wrong with the following code? : Questions « Object Oriented « SCJP

1. SCJP
2. Object Oriented
3. Questions

public class MainClass{
   String msg = "Type is " ;
   public void showType( int n ) {
     String tmp ;
     if( n > 0 ) tmp = "positive";
     System.out.println( msg + tmp );
   }
 }