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println() : question from JQPlus

 
Ranch Hand
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What will happen when this code is compiled and run?

Acc.to JQPlus,the answer is the code won't compile.
I tried the above code ,it compiles and runs printing : nullnull
nulltrue
truenull

In this case,it gives a compiler error ,as it's an ambiguous reference : bcos println() can take both char[] & String as parameters.
Could someone clarify these 2 cases ?
Thanks in advance.
 
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1st case:
I tried to compile it, but got the following compile-time errors:

2nd case
Sorta self explanitory by the error message isn't it? if you change the code to this (and avoid the ambiguity) things compile/run fine:
 
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