Question: When you put an object's reference variable in a place where a String is expected ( like System.out.printIn ( objname ) ) , what will

When you put an object's reference variable in a place where a String is
expected (like System.out.printIn(objname)), what will happen?
The first String field inside the object will be used as a string
Compile error
The object reference's name will be used as a string
The object's class' toString() method will be called
When you put an object's reference variable in a

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