We learned the string. Join function (http://blog.csdn.net/zhvsby/archive/2008/11/28/3404704.aspx) last time, and used the string. Split function, so we can check the usage of this function online, for example:
#Used inString. SplitNotes for using methods to cut strings:
String. SplitIt provides us with a very flexible way to use,However, it is assumed that the service is improperly used.,May cause errors,RecentlyCode ReviewHour,Most people use this method.:
String S="A | B |: | C: D";
String[]SS=S.Split("|: |".Tochararray());
// Ss [0]:
// Ss [1]: B
// Ss [2]:
// Ss [3]:
// Ss [4]: c
// Ss [5]: d
In fact, his intention is to use"|: |"Separate strings,The objective is to get the Array:"A | B" And"C: d",But not directly foundSplit (string).,All are usedTochararray (),Obviously,The result is incorrect..
The correct method is:
String[]SS1=S.Split(New[] {"|: |"},Stringsplitoptions.None);
// SS1 [0]: A | B
// SS1 [1]: C: d
Next shard count,Indicates whether you are active or not.Remove emptyData.For example:"A | B |: | C: d |: |" Cutting,Returns three arrays.,The last element of the array is null."",Suppose we want to filter out these empty elements.,Number of available shards:Stringsplitoptions.Removeemptyentries That is:String[]SS1=S.Split(New[] {"|: |"},Stringsplitoptions.Removeemptyentries);
Example:
S="A | B |: | C: d |: |";
String[]SS1=S.Split(New[] {"|: |"},Stringsplitoptions.Removeemptyentries);
// SS1 [0]: "A | B"
// SS1 [1]: "C: D"
SS1=S.Split(New[] {"|: |"},Stringsplitoptions.None);
// SS1 [0]: "A | B"
// SS1 [1]: "C: D"
// SS1 [2]: ""
First, we can see that the string. split method has six overload functions:
1) Public String [] Split (Params char [] separator)
2) Public String [] Split (char [] separator, int count)
3) Public String [] Split (char [] separator, stringsplitoptions options)
4) Public String [] Split (string [] separator, stringsplitoptions options)
5) Public String [] Split (char [] separator, int count, stringsplitoptions options)
6) Public String [] Split (string [] separator, int count, stringsplitoptions options) Below we use some instances to explain how to use (below string words = "1, 2.3 ,, 4 ";):
1. Public String [] Split (Params char [] separator)
Program code string [] split = words. split (New char [] {','}); // return value: {"1", "2.3", "", "4 "}
String [] split = words. split (New char [] {',', '. '}); // return: {"1", "2", "3", "", "4 "}
2. Public String [] Split (char [] separator, int count)
Program code string [] split = words. split (New char [] {',', '. '}, 2); // return: {"1", "2.3, 4 "}
String [] split = words. split (New char [] {',', '. '}, 6); // return: {"1", "2", "3", "", "4 "}
3. Public String [] Split (char [] separator, stringsplitoptions options)
Program code string [] split = words. split (New char [] {',', '. '}, stringsplitoptions. removeemptyentries); // return value: {"1", "2", "3", "4"} empty element not retained
String [] split = words. split (New char [] {',', '. '}, stringsplitoptions. none); // return: {"1", "2", "3", "", "4"} retain null Elements
4. Public String [] Split (string [] separator, stringsplitoptions options)
Program code string [] split = words. split (New String [] {",", ". "}, stringsplitoptions. removeemptyentries); // return value: {"1", "2", "3", "4"} empty element not retained
String [] split = words. split (New String [] {",", ". "}, stringsplitoptions. none); // return: {"1", "2", "3", "", "4"} retain null Elements
5. Public String [] Split (char [] separator, int count, stringsplitoptions options)
Program code string [] split = words. split (New char [] {',', '. '}, 2, stringsplitoptions. removeemptyentries); // return value: {"1", "2.3, 4"} empty elements are not retained.
String [] split = words. split (New char [] {',', '. '}, 6, stringsplitoptions. none); // return: {"1", "2", "3", "", "4"} retain null Elements
6. Public String [] Split (string [] separator, int count, stringsplitoptions options)
Program code string [] split = words. split (New String [] {",", ". "}, 2, stringsplitoptions. removeemptyentries); // return value: {"1", "2.3, 4"} empty elements are not retained.
String [] split = words. split (New String [] {",", ". "}, 6, stringsplitoptions. none); // return: {"1", "2", "3", "", "4"} retain null Elements
Personal Understanding: split is string. A function opposite to join is used to separate a string into arrays containing multiple fields. Now I only analyze the method above: String [] split = words. split (New char [] {',', '. '}, 6); // return: {"1", "2", "3 ","", "4"} Why is there an empty "" Returned? At that time, I did not understand it. In fact, it is "," and ". "Two delimiters are used to split strings 1, 2.3, and 4. When the first separator after 3 is found," It indicates that the separator is separated, but it is followed by a separator ", "What should we do? This can be regarded as" "empty to deal with the two consecutive ", "I think there is a space character. We are very grateful for pointing out the incorrect information.
