实现string的 sblit subString 的功能

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import java.util.Random;
//编写实现string的 sblit subString 的功能

public class StringDemo {
public static void main(String args[]) {
String Str = getStr(10);
System.out.println("使用String.splic()的切分字符串");
long st1 = System.nanoTime();
String[] result = Str.split("\\.");
System.out.println("String.splic()截取字符串用时：" + (System.nanoTime() - st1));
System.out.println("String.splic()截取字符串结果个数：" + result.length);
System.out.println();

   long st5 = System.nanoTime();
   int len = Str.lastIndexOf(".");
   System.out.println("使用String.substring()切分字符串");
   int k = 0, count = 0;
   for (int i = 0; i <= len; i++) {
    if (Str.substring(i, i + 1).equals(".")) {
       if (count == 0) {
        Str.substring(0, i);
      }
    else {
      Str.substring(k + 1, i);
      if (i == len)
       {
                       Str.substring(len + 1, Str.length());
       }
      }
       k = i;
       count++;
      }
     }
   System.out.println("String.substring()截取字符串用时" + (System.nanoTime() - st5));
   System.out.println("String.substring()截取字符串结果个数：" + (count + 1));

}

private static String getStr(int len) {
        StringBuffer sb = new StringBuffer();
       StringBuffer result = new StringBuffer();
       Random random = new Random();
   for (int i = 0; i < len; i++) {
        sb.append(random.nextInt(9)).append(random.nextInt(9)).append(random.nextInt(9));
        result.append(sb.toString());
             sb.delete(0, sb.length());
         if (i != len - 1)
          result.append(".");
}
   return result.toString();

}
}

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