sop("("+reverseString(str,3,4)+")");//爲何不轉呢？" ba cd ";

class  StringLianXi { public static void sop(String s) { System.out.println(s); } public static void main(String[] args)  { String str ="   ab  cd   "; sop("("+str+")"); //str= myTrim(str); //sop("("+

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