System.out.println(null)

[Christy Smith]

Could some one explain to me why System.out.println(null) causes a compilation error, but System.out.println(null + "bob") prints out "nullbob"?
Thanks

[Anonymous]

Hi Christy.
consider the following code.

class sample{
 sample(String s){
   System.out.println("String");
 }
 sample(StringBuffer sb){
   System.out.println("StringBuffer");
 }
}
class constructor{
  public static void main(String arg[]){
   sample s1=new sample(null);
  }
}

This code does not compile. Both the classes is at the same level in the hierarchy chart. If you had used Object , String istead it would have printed string. So if I'm getting this right there a more then one method that fits with the desription System.out.println( null ). The compiler doesn't know which method to use and a compile error occurs.
Please correct me if I'm wrong. Code example from http://www.go4java.20m.com/mockExam.htm

[Ashik Uzzaman]

Right mathias! Smith u can search for the same topic in this forum posted earlier...
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azaman