This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I think the answer is MyObj.
From the code , the toString method seems overloaded correctly.
Step 1. toto.getMyObj() returns a MyObj object which is actually a MySubObj.
Step 2. What is passed in as the argument of toto.toString()? an object of MyObj type
Step 3. So, the toString(MyObj swap) is called instead of toString(MySubObj)
Step 4 Therefore, it prints MyObj.
Correct me if I am wrong.
Joined: Apr 13, 2011
Naturally I would have assume that at runtime the JMV would sort it out and use MySubObj.