Posted on 2007-07-17 23:29
kooyee 閱讀(1550)
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Java
public String[] split(String regex, int limit)
limit n 大于0，則pattern（模式）應用n - 1 次
String s = "boo:and:foo"
s.split(":",2)
//result is { "boo", "and:foo" }limit n 小于0，則pattern（模式）應用無限次
String s = "boo:and:foo"
s.split(":",-2)
//result is { "boo", "and", "foo" }
limit n 等于0，則pattern（模式）應用無限次并且省略末尾的空字串
String s = "boo:and:foo"
s.split("o", -2)
//result is { "b", "", "and:f", "", "" }
s.split("o", 0)
//result is { "b", "", "and:f" }
The limit parameter controls the number of times the pattern is applied and therefore affects the length of the resulting array. If the limit n is greater than zero then the pattern will be applied at most n - 1 times, the array's length will be no greater than n, and the array's last entry will contain all input beyond the last matched delimiter. If n is non-positive then the pattern will be applied as many times as possible and the array can have any length. If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.
The string "boo:and:foo", for example, yields the following results with these parameters:
| Regex |
Limit |
Result |
| : |
2 |
{ "boo", "and:foo" } |
| : |
5 |
{ "boo", "and", "foo" } |
| : |
-2 |
{ "boo", "and", "foo" } |
| o |
5 |
{ "b", "", ":and:f", "", "" } |
| o |
-2 |
{ "b", "", ":and:f", "", "" } |
| o |
0 |
{ "b", "", ":and:f" } |