【试题描述】定义一个函数，字符串转数组数组转字符串

【参考代码】

1     public static int strToInt(String str) 2     { 3         int i = 0, num = 0; 4         char[] strTemp = str.toCharArray(); 5         boolean isNeg = false; 6         int len = str.length(); 7  8         if (strTemp[0] == '-') 9         {10             isNeg = true;11             i = 1;12         }13         while (i < len)14         {15             num *= 10;16             num += (strTemp[i++] - '0');17         }18         if (isNeg)19             num *= -1;20         return num;21     }

1     public static String intTOStr(int num) 2     { 3         char[] tempChar = new char[11]; 4         int i = 0; 5         boolean isNeg = false; 6         if (num < 0) 7         { 8             num *= -1; 9             isNeg = true;10         }11         do{12             tempChar[i++] = (char) (num % 10 + '0');13             num /=10;14         }while (num != 0);15         16         if(isNeg)17             tempChar[i] = '-';18         System.out.println(tempChar);19         StringBuilder b = new StringBuilder();20         while(i>=0)21         {22             b.append(tempChar[i--]);23         }24     25         return b.toString();26     }