Displaying Hexadecimal Number in Java
You may sometimes need to print a number in hexadecimal format. To display an integer y in hexadecimal format, you may use the following.
System.out.println(String.format("%x", y));
This is a complete example showing how an integer is displayed in hexadecimal.
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If you compile and run this program, you will get following output.
16 in hexa is f |
An integer is 4 bytes long. So you may want to pad the output with leading zeros. This can be done by replacing
System.out.println("15 in Hexa is " + String.format("%x", y));
with
System.out.println("15 in Hexa is " + String.format("%08x", y));
Which gives the output
16 in hexa is 000000f |
Exercise
Write a program that will print numbers 0 to 255 in hexadecimal. It should have 2 digit and 1 digits number should be represented with leading zero.
Compare you solution with this one.
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You may also use
System.out.println( Integer.toHexString(i));
or System.out.printf("%02x", number);
to achieve the same result.
For example the numbe problem could be solved using.
for ( i=0; i<=255; i++)
System.out.printf("%02x\n", i);