java - 进制转换

    public static void main(String[] args ){

        int i = 8;
        String s2 = Integer.toString(i,2);
        System.out.println("2进制为："+s2);
//        -- 1000
        int sum = 0;
        for (int j = 0; j < s2.length(); j++) {
            int x = Integer.parseInt(String.valueOf(s2.charAt(j)));
            sum += x * Math.pow(2,(s2.length()-j-1));
        }
        System.out.println("10进制为："+sum);

        
    }