data-structure

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public static String toString(int n, int radix) { String str = ""; while (n > 0) { int k = n % radix; str = (char) (k

caicai12

caicai12

计算子串长度是 end-begin，而不是 begin-end char[] buffer = new char[end - begin];

qx-1024

复制 str 时应该是 buffer[i + j] = str.value[j]; 而不是 buffer[j] = str.value[j]; j 从 0 开始，这样会导致原来的字符串被覆盖了

qx-1024