JAVA substring 正反截取字符串

Stringstr="abcdefghmf";         System.out.println("截取前三個字符："+str.substring(0,3));     System.out.println("截取前三個字符之外的字符：="+str.substring(3));      System.out.println("截取後三個字符："+str.substring(str.lengt

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