【IT笔试面试题整理】字符串转数组+数组转字符串

【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】

    public static int strToInt(String str)
    {
        int i = 0, num = 0;
        char[] strTemp = str.toCharArray();
        boolean isNeg = false;
        int len = str.length();

        if (strTemp[0] == '-')
        {
            isNeg = true;
            i = 1;
        }
        while (i < len)
        {
            num *= 10;
            num += (strTemp[i++] - '0');
        }
        if (isNeg)
            num *= -1;
        return num;
    }

    public static String intTOStr(int num)
    {
        char[] tempChar = new char[11];
        int i = 0;
        boolean isNeg = false;
        if (num < 0)
        {
            num *= -1;
            isNeg = true;
        }
        do{
            tempChar[i++] = (char) (num % 10 + '0');
            num /=10;
        }while (num != 0);
        
        if(isNeg)
            tempChar[i] = '-';
        System.out.println(tempChar);
        StringBuilder b = new StringBuilder();
        while(i>=0)
        {
            b.append(tempChar[i--]);
        }
    
        return b.toString();
    }