AQuestion

[Jaya Murugan]

public class AQuestion
{
public void method(Object o)
{
System.out.println("Object Verion");
}
public void method(String s)
{
System.out.println("String Version");
}
public static void main(String args[])
{
AQuestion question = new AQuestion();
question.method(null);
}
}
Output of the above code is..
String Varsion
im bit confused pls help
regards
Jaya Murugan

[Suresh Selvaraj]

Hi,
java.lang.Object is at the root of the hierarchy and since all classes extend java.lang.Object, at runtime the argument "null" is passed to the most specific method that has subclasses of java.lang.Object as a parameter.
In the code sample, if the method that has String as a parameter is commented out then "Object Version" gets printed.
You may try the code mentioned below.
...
public void method(String s)
{
System.out.println("String Version");
}
public void method(String [] s1)
{
System.out.println("String Array Verion");
}
...

Here I 've included a method that has a String [] as a parameter.
This may result in Compile time error with the meassge
"reference to method is ambiguous".
Since both the methods have "SAME SIGNATURE" i.e,with same method name and same parameter type, the compiler will not know which method to invoke and hence throws a compile time error stating that reference to the method is ambiguous.
- Suresh Selvaraj

[Jaya Murugan]

HI SURESH..
GOT IT
THNAKS
JAYA MURUGAN