About Variable defining

Question

hello,
1)Is
'Long variable' the same as 'long variable'? will they both compile?
2) i wrote a small program, and the named the CLASS Fruit. I then saved the file as fruit.java (notice the capitalization) . When i typed javac fruit.java, an error was given, however when i type javac Fruit.java(even thought the file doesnt exist), the program complies to a class file. why is that??
3) In a program i declare ' long ali=1L'
later in the program i wish to change the value of 'ali' to 8
do i type ali=8 or ali=8L?
thanks

Answer 1

so typing 8 or 8L doesnt make a difference? but i should type 8L for the sake clarity?Well, 'clarity' is all subjective, but basically, this is what's happening:
In general when the compiler sees lhs= rhs where 'rhs' is a literal
numerical expression, it attempts to cast the 'rhs' type to the 'lhs' type.
If it can do so without loss of precision, it will do so unless you've
explicitly given the type of the 'rhs'. In case of a trailing 'L', you're
explicitly telling that the literal has type long. Here are some examples:byte a= 123;  // fine: 123 fits in a byte
byte a= 255; // error: max byte value = 127
byte a= (byte)255; // fine again, you explicitly casted the value
byte a= 42L; // error: the compiler is not allowed to cast and byte != long
byte a=(byte)42L; // fine again, you explicitly casted the value
byte a= (int)42L; // fine because an int can be casted back to a byte again.
byte a= (int)10000L; // error: explicit int too big for a byte
byte a= (byte)(int)1000L; // fine: explicit cast to byte with loss of precision
byte a= (byte)1000L; // same as above
byte a= 3.14 // error: the compiler is not allowed to cast and byte != double
byte a= (byte)3.14; // fine again: you explicitly casted the value
byte a= (int)3.14; // fine because an int can be casted back to byte again
byte a= (long)3.14; // error: the compiler is not allowed to cast and byte != longDid this clear things up a bit?
kind regards,
Jos