Java計算平方與化為二進位

import javax.swing.*;
class compute
{
    long square(long x)
    {
        return x*x;
    }
    boolean[] binary(long x)
    {
        int bitN=(int)Math.ceil(Math.log(x+1)/Math.log(2));
        boolean [] b=new boolean[bitN];
        int i=bitN-1;
        do
        {
            b[i--]=((x&1)==1)?true:false;
            x=x>>1;
        } while (x!=0);
        for (i=0;i<bitN; i++)
            System.out.print(b[i]?1:0);
        System.out.println();
        return b;
    }
}
public class power
{
    public static void main(String[] argv) throws Exception
    {
        compute math=new compute();
        long x=new Long(JOptionPane.
        showInputDialog("x=")).longValue();
        boolean[] b=math.binary(x);
        long y=math.square(x);
        JOptionPane.showMessageDialog(null, x+"*"+x+"="+Long.toString(y));
    }
}