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Marcus Green Exam 1 Question 25

 
Debra Shifferd
Greenhorn
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What will happen if you attempt to compile and run the following code?

Integer ten=new Integer(10);
Long nine=new Long (9);
System.out.println(ten + nine);
int i=1;
System.out.println(i + ten);

1) 19 followed by 20
2) 19 followed by 11
3) Compile time error
4) 10 followed by 1

Marcus states the correct answer is: 3) Compile time error - The wrapper classes cannot be used like primitives.

But when I put this code in a class with main(), it compiled and matched answer #2, 19 followed by 11
 
Nitish Bangera
Ranch Hand
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Eclipse IDE Java Python
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Yeah your answer is correct. I think Long nine = 9 will give the compile time error. Or may be this mock is for an older version of java like prior to java5.
 
It is sorta covered in the JavaRanch Style Guide.
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