String object with operation

Can anyone please explain to me why above code output is

Hello, StringObject@<hascode>
Hello, World

I understand StringBuilder value but not value from StringObject

Thanks

Claire Chan wrote:I understand StringBuilder value but not value from StringObject

What did you expect as output for StringObject object?

When you try to print and object, the toString() method is called, but your class StringObject doesn't override the toString() method, so it uses the one inherited from Object, which prints this pattern of the type of the object plus @ plus hash code, as you can see in the Java documentation.

If you override the method toString, you can have another result, like this: