## Integer to two digits hex in Java

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I need to change a integer value into 2-digit hex value in Java.Is there any way for this. Thanks

My biggest number will be 63 and smallest will be 0. I want a leading zero for small values.

String.format("%02X", value);

If you use `X`

instead of `x`

as suggested by aristar, then you don't need to use `.toUpperCase()`

.

**Converting to/from hexadecimal in Java,** How to convert from decimal to hex (and vice versa) in Java. than 0-9. The extra digits are represented by the letters A-F, as shown in the table to the right. To go the other way round and convert decimal to hex in Java, you can use the utility method Integer. There are generally two conventions for writing hex numbers. The Integer.toHexString() method in Java converts Integer to hex string. Let’s say the following are our integer values. int val1 = 5; int val2 = 7; int val3 = 13; Convert the above int values to hex string. Integer.toHexString(val1); Integer.toHexString(val2); Integer.toHexString(val3); Example. Live Demo

Integer.toHexString(42);

Javadoc: http://docs.oracle.com/javase/6/docs/api/java/lang/Integer.html#toHexString(int)

Note that this may give you more than 2 digits, however! (An Integer is 4 bytes, so you could potentially get back 8 characters.)

Here's a bit of a hack to get your padding, as long as you are absolutely sure that you're only dealing with single-byte values (255 or less):

Integer.toHexString(0x100 | 42).substring(1)

Many more (and better) solutions at Left padding integers (non-decimal format) with zeros in Java.

**Convert from decimal to hexadecimal with leading zeroes and ,** Java int:int is 32 bit signed type ranges from –2,147,483,648 to 2,147,483,647. 2.6.2. Integer: MAX, MIN VALUE. 2.6.3. The number of bits used to represent an The java.lang.Integer.toHexString() method returns a string representation of the integer argument as an unsigned integer in base 16. The following characters are used as hexadecimal digits:0123456789abcdef.

String.format("%02X", (0xFF & value));

**2 Examples to Add Zeros at the Beginning of a Number in Java ,** Java has rich API and thankfully neither converting an integer to String is Earlier we have learned about formatting floating point numbers in Java and that Java Decimal to Hex conversion: Integer.toHexString() The Integer.toHexString() method converts decimal to hexadecimal. The signature of toHexString() method is given below: Let's see the simple example of converting decimal to binary in java.

Use `Integer.toHexString()`

. Dont forget to pad with a leading zero if you only end up with one digit. If your integer is greater than 255 you'll get more than 2 digits.

StringBuilder sb = new StringBuilder(); sb.append(Integer.toHexString(myInt)); if (sb.length() < 2) { sb.insert(0, '0'); // pad with leading zero if needed } String hex = sb.toString();

**Java program to convert decimal to hexadecimal,** There are two following ways to convert Decimal number to hexadecimal number: remainder int rem; // For storing result String str2=""; // Digits in hexadecimal Given a number with several digits, we wish to convert it to a String instance of a specific length. If the length is greater than the number of digits, zeroes will be padded in front of the number. For example, if we have the number. int number = 123; And if we wish to convert the value to a String with length 5, since there are only 3 digits present in the number, our desired String value is:

If you just need to print them try this:

for(int a = 0; a < 255; a++){ if( a % 16 == 0){ System.out.println(); } System.out.printf("%02x ", a); }

**Java Convert Hex to Decimal,** Java Convert hex to decimal example and examples of string to int, int to string, int getDecimal(String hex){; String digits = "0123456789ABCDEF";; hex = hex. Use format instead of using the hex function: >>> mychar = ord('a') >>> hexstring = '%.2X' % mychar. You can also change the number "2" to the number of digits you want, and the "X" to "x" to choose between upper and lowercase representation of the hex alphanumeric digits.

**Hexadecimal Numbers and Hexadecimal Numbering System,** Then two hexadecimal numbers are required to produce one full byte ranging from 00 to FF. Also, since 16 in the decimal system is the fourth power of 2 ( or 24 ), int value under 10 convert to string two digit number. If you want hexadecimal: How do I convert a String to an int in Java?

**Chapter 3: Numbers, Characters and Strings -- Valvano,** Numbers can be written in three bases (decimal, octal, and hexadecimal). Although the Let the operation [[x]] be the greatest integer of x. E.g. If a byte is used to represent a signed 2's complement number, then the value of the number is. Write a Java program to convert a decimal number to hexadecimal number. Decimal number: The decimal numeral system is the standard system for denoting integer and non-integer numbers. It is also called base-ten positional numeral system. Hexadecimal number: Hexadecimal is a positional numeral system with a radix, or base, of 16.

**HexUtils (Tomcat API Documentation),** Convert a byte array into a printable format containing a String of hexadecimal digit characters (two per byte). static byte[], convert(java.lang.String digits) Convert a There are two following ways to convert Decimal number to hexadecimal number: 1) Using toHexString() method of Integer class. 2) Do conversion by writing your own logic without using any predefined methods.

##### Comments

- You need to print it? you need to turn it into a string?
- i will write into file as two-digit hex
- Have you at least checked the Integer javadoc? How do you plan to convert 12345656 to a 2-digit hex value?
- This is the best answer at present.
- Agreed this one is much better than any of the others. It works perfectly. The only thing I would suggest is a little more description of the parameters passed to the method. I had to look up if I passed the value as an integer or as a hex string.
- Nice zero-padding hack :)
- You can use the same technique for larger values. If you want padding for up to 2-byte values you can do Integer.toHexString( 0x10000 | value).substring(1). For N hex digits you append N 0s after the "1". Of course, your hex value must have no more than N digits.
- Can someone explain why this is doing a bit-wise and with 0xFF? This is why answers on SO shouldn't just be the code
- OxFF & (byte)value just convert signed byte to unsigned. (int)-1 = 0xFFFFFFFF, (int)(-1 & 0xFf) = 0xFF
- In this case, the bit-wise and with 0xFF is not necessary because of the "%02X" format.
- The %02X specifier specifies a minimum of two digits. If you want exactly two digits (discarding higher bits) then you need the bitwise and.
- Good to know, thanks for this additional information !
- Is the use of
`StringBuilder`

actually an improvement? pastebin.com/KyS06JMz