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Java SE 6 Programmer Certified Professional (1Z0-851)

Question : 1

Total: 10

Given :

1. class SuperFoo {  
2.  SuperFoo doStuff(int x) {  
3.    return new SuperFoo();  
4.  }  
5. }  
6.  
7. class Foo extends SuperFoo {  
8.    /* insert code here*/  
9. }  
  
And four declarations:  
I.   Foo doStuff(int x) { return new Foo(); }  
II.  Foo doStuff(int x) { return new SuperFoo(); }  
III. SuperFoo doStuff(int x) { return new Foo(); }  
IV.  SuperFoo doStuff(int y) { return new SuperFoo(); }

Which, inserted independently at line 8, will compile?

Only I
Only IV
Only I and III.
Only I, II, and III.
Only I, III, and IV. (*)
All four declarations will compile.

Validate

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