a stupid question# Java - 爪哇娇娃
p*p
1 楼
which is better
String add;
while(XXX) {
add=XXXX
....
}
or
while(XXX) {
String add=XXXX
....
}
String add;
while(XXX) {
add=XXXX
....
}
or
while(XXX) {
String add=XXXX
....
}
g*y
2 楼
I would use second -- it restrict the variable "add" in local, that gives
yourself a better protection from making mistakes.
Example ->
String add;
while(XXX) {
add = XXXX
... (200 lines)
}
String message = getMessage(add);
This program runs fine. One month later, you accidentally change that "add"
in the 200 lines, forgot that message also depends on "add". Now your
trouble starts.
During a variable's life cycle, you always need to remeber and be
responsible for it. Just to make your life
【在 p***p 的大作中提到】
: which is better
: String add;
: while(XXX) {
: add=XXXX
: ....
: }
: or
: while(XXX) {
: String add=XXXX
: ....
yourself a better protection from making mistakes.
Example ->
String add;
while(XXX) {
add = XXXX
... (200 lines)
}
String message = getMessage(add);
This program runs fine. One month later, you accidentally change that "add"
in the 200 lines, forgot that message also depends on "add". Now your
trouble starts.
During a variable's life cycle, you always need to remeber and be
responsible for it. Just to make your life
【在 p***p 的大作中提到】
: which is better
: String add;
: while(XXX) {
: add=XXXX
: ....
: }
: or
: while(XXX) {
: String add=XXXX
: ....
p*p
3 楼
why no diff in performance? new instances are repeatly created
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