Layout
convention: use of spaces
Java treats multiple space characters
as if there were only one, unless they occur inside double quotation marks
as part of a string. Also there are many parts of Java statements
where no space character is needed, but where such a character can help
to make the Java code easier to read for a human. Each of the following
statements is treated just the same by the Java compiler:
if((cost<2000)&&(product=="car"))
if(
(cost<2000) && (product=="car") )
if(
(cost < 2000) && (product == "car") )
if(
( cost < 2000 ) && ( product == "car" ) )
if(
( cost < 2000) && ( product == "car" ) )
Most programmers would agree that in the
last line the use of space characters does not help a human reader of the
program see that there are 2 parts to the expression, i.e.(cost<2000)
and
(product=="car").
However, as to which of the first four lines is most clear might be the
subject of some debate.
We would recommend you do use some
space characters to help show the different parts of a statement (which
would rule out the first line), however as long as you are consistent in
your usage, any of the styles of the middle three lines above would be
reasonable.
As a general rule, when a message is
being sent to an object that contains arguments, inserting a space after
each comma in the argument list does make the statement easier for a human
to read. Thus rather than this form:
balls[0]
= new Ball(100,100,radius,4,5);
we would recommend you insert the spaces
after commas as follows:
balls[0]
= new Ball(100, 100, radius, 4, 5);
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