java（四）【数组】进制、二维数组

十进制--》二进制

public class asd {
    public static void main(String[] args) {
    qwe(6);    
    }
    public static void qwe(int num)
    {
        StringBuffer sb = new StringBuffer();
        while (num>0)
        {
            //System.out.println(num%2);
            sb.append(num%2);
            num =num/2;
        }
        System.out.println(sb.reverse());
    }
}