toString, method why it is not called implicitly for objects

class building {}
public class Example
{
Public Shared Sub main()
{
Building b = new Building();
String s = (String) b;
}
}

in the 5th line it shows error that cannot cast building type in string...
but all classes have the toString method that is called whenever we give the object argument in System.out.println ();

the following code compiles

class building {}
Class Example
{
Public Shared Sub main()
{
Building b = new Building();
System.out.println (b);
}
}
can someone explain this?

is the tostring method implicitly called only in println where he expects a string?

It is not called implicitly anywhere. It is explicitly called by println (Object).

Tags: Java

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