练习查找和检索子字符串

String[] stringWithSpace = string.split(" ");
StringBuilder stringBuilder = new StringBuilder();
if (int i = 1; i< 5; i++ ){
    StringBuilder.append(stringWithSpace[i]);
    StringBuilder.append(" ");
}
String[] stringWithTabs = string.split("\\t");
if (stringWithTabs.length < 3) throw new StringTooShortException();
return stringWithTabs[1];