outputting a number in binary form

[Brett Delia]

I was wondering if there was an easy way to output an int or long in their binary form ie. the number 5 as 00000101?
Any suggestions?
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[Mark Savory]

The class java.lang.Integer has many methods for creating String representation of integer values as binary, hex, octal, etc.

[Cindy Glass]

For example:
String s = Integer.toBinaryString(5);
System.out.println(s);
or
String s = Integer.valueOf(5,2); // 5 is the int to print base 2

[Brett Delia]

Thanks for the suggestions...I have tried both ways ans they work great.
I am actually going to resort to creating my own method for displaying the binary format for a number. I am head up a study group at work for Java Certification and I have come up with a 'homework' assignment for the engineers to do to get more familiar with bit shifting and the bit-wise operators. So what I am wanting is something that displays the binsary number including all bits for a specific data type, for instance...
an int 5 -> 00000000000000000000000000000101
whereas the methods above would show only 101
This way it is easier to get a grasp on what exactly the different bit-wise operaters are doing.
Thanks for the help...

[Tom Patrick]

You can use the DecimalFormat class to do exactly that.
so if you had:
DecimalFormat binFormat = new DecimalFormat("00000000");
and then just did something like
int sumBinNum = 101;
System.out.println("The binary number: " + binFormat.format(sumBinNum));
then you will get "The binary number: 00000101"
[This message has been edited by Tom Patrick (edited March 07, 2001).]

[Carl Trusiak]

Originally posted by Brett Delia:
So what I am wanting is something that displays the binsary number including all bits for a specific data type, for instance...
an int 5 -> 00000000000000000000000000000101
whereas the methods above would show only 101

Take a look at Cat and Mouse Game with Bits
The routine that formats the bit output in the applet is

    String format ( int in )
    {
        String bitsIn = Integer.toBinaryString( in );
        bitsIn = "00000000000000000000000000000000000000000" + bitsIn;
        bitsIn = bitsIn.substring( bitsIn.length () - 32 );
        String  bit1 = bitsIn.substring( 0, 8 );
        String  bit2 = bitsIn.substring( 8, 16 );
        String  bit3 = bitsIn.substring( 16, 24 );
        String  bit4 = bitsIn.substring( 24 );
        return bit1 + " " + bit2 + " " + bit3 + " " + bit4 ;
    }

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Hope This Helps:)
Carl Trusiak