2 Question from newbie!

[Edmund Chiang]

1)When you declare a long variable without the (L or l) does it default to int?
long l = 255L; //OK!
long l = 255; //does it default to int?
2)When a constructor is private in class1 can you still subclass class1 with class 2 and use the constructor in class2 to access members in class1 or will there be an error?

Thanks in Advance!
Edmund

[henry wu]

I think the answer to your first question is that it defaults to an int and then gets automatically converted to a long.

[henry wu]

>> 2)When a constructor is private in class1 can you still subclass class1 with class 2 and use the constructor in class2 to access members in class1 or will there be an error?
If the constructor in class1 is private, then the subclass class2 will not be able to call it.
A private method may only be used by an instance of the same class.

[Art Metzer]

>>1)When you declare a long variable without the (L or l) does it default to int ?
Yes. In your example

<font size="2.0">
long l = 255; //does it default to int?

when Java encounters 255, it treats it as an int. Since the long it is putting 255 into is wider than an int, there's no problem.
For this next exercise, keep in mind that Integer.MAX_VALUE = 2147483647:

<font size="2.0">
long x = 1234567891011;
System.out.println( x );

This code will not compile! Since 1234567891011 has no suffix, Java tries to treat it like an int, but then it can't fit that behemoth into int's thirty-two bits, and the compiler complains:

<font size="2.0">
integer number too large: 1234567891011
        long x = 1234567891011;
                 ^
1 error

To remedy this problem, you need to say

<font size="2.0">
long x = 1234567891011<font color="red">[B]L[/B]</font>;
System.out.println( x );

Good luck, Edmund.
Art

[Edmund Chiang]

Thanks for the quick reply!
Best Regards
Edmund