java split函数

实例一

* stringhelper.split("1-2-3", "-"); 
 * result: {"1","-","2","-","3"} 
 * stringhelper.split("-1--2-", "-"); 
 * result: {"","-","1","-","","-","2","-",""} 
 * stringhelper.split("123", ""); 
 * result: {"123"} 
 * stringhelper.split("1-2--3---4----5", "--"); 
 * result: {"1-2","--","3","--","-4","--","","--","5"}

public static string[] split(string s, string delimiter){
    int delimiterlength;
    // the next statement has the side effect of throwing a null pointer
    // exception if s is null.
    int stringlength = s.length();
    if (delimiter == null || (delimiterlength = delimiter.length()) == 0){

      return new string[] {s};
    }


    int count;
    int start;
    int end;

    // scan s and count the tokens.
    count = 0;
    start = 0;
    while((end = s.indexof(delimiter, start)) != -1){
      count++;
      start = end + delimiterlength;
    }
    count++;

    // allocate an array to return the tokens,
    // we now know how big it should be
    string[] result = new string[count];

    // scan s again, but this time pick out the tokens
    count = 0;
    start = 0;
    while((end = s.indexof(delimiter, start)) != -1){
      result[count] = (s.substring(start, end));
      count++;
      start = end + delimiterlength;
    }
    end = stringlength;
    result[count] = s.substring(start, end);

    return (result);
}

实例二

public static string[] splitincludedelimiters(string s, string delimiter){
    int delimiterlength;

    int stringlength = s.length();
    if (delimiter == null || (delimiterlength = delimiter.length()) == 0){

      return new string[] {s};
    }


    int count;
    int start;
    int end;

    // scan s and count the tokens.
    count = 0;
    start = 0;
    while((end = s.indexof(delimiter, start)) != -1){
      count+=2;
      start = end + delimiterlength;
    }
    count++;

    // allocate an array to return the tokens,
    // we now know how big it should be
    string[] result = new string[count];

    // scan s again, but this time pick out the tokens
    count = 0;
    start = 0;
    while((end = s.indexof(delimiter, start)) != -1){
      result[count] = (s.substring(start, end));
      count++;
      result[count] = delimiter;
      count++;
      start = end + delimiterlength;
    }
    end = stringlength;
    result[count] = s.substring(start, end);

    return (result);
}

}

补充：Jsp教程,Java基础