jsp substring()函數實現字串截取方法

str＝str.substring(int beginIndex);截取掉str從首字母起長度為beginIndex的字串，將剩餘字串賦值給str；

str＝str.substring(int beginIndex，int endIndex);截取str中從beginIndex開始至endIndex結束時的字串，並將其賦值給str;

執行個體

 

public class Utils {
  public static String diff(String str1, String str2) {
    int index = str1.lastIndexOf(str2);
    if (index > -1) {
      return str1.substring(str2.length());
    }
    return str1;
  }
}

執行個體二

public class TestSubstring {

 public static void main(String[] args) {
  String str1 = "fghjkl";
  String str2 = str1.substring(1);//從第1號位置開始截取字串，截到最後,把截取後的返回，賦值給str2
  System.out.println("str1 == " + str1);
  System.out.println("str2 == " + str2);
 }
}

執行個體三

public static String substring(String str, int start, int end) {
      if (str == null) {
          return null;
      }

      // handle negatives
      if (end < 0) {
          end = str.length() + end; // remember end is negative
      }
      if (start < 0) {
          start = str.length() + start; // remember start is negative
      }

      // check length next
      if (end > str.length()) {
          end = str.length();
      }

      // if start is greater than end, return ""
      if (start > end) {
          return "";
      }

      if (start < 0) {
          start = 0;
      }
      if (end < 0) {
          end = 0;
      }

      return str.substring(start, end);
  }

}