for example, for 1, 2, 128, 256 the output can be (16 digits):
0000000000000001
0000000000000010
0000000010000000
0000000100000000
I tried
String.format("%16s", Integer.toBinaryString(1));
it puts spaces for left-padding:
` 1'
How to put 0s for padding. I couldn't find it in Formatter. Is there another way to do it?
P.S. this post describes how to format integers with left 0-padding, but it is not for the binary representation.
I think this is a suboptimal solution, but you could do
String.format("%16s", Integer.toBinaryString(1)).replace(' ', '0')
There is no binary conversion built into the java.util.Formatter, I would advise you to either use String.replace to replace space character with zeros, as in:
String.format("%16s", Integer.toBinaryString(1)).replace(" ", "0")
Or implement your own logic to convert integers to binary representation with added left padding somewhere along the lines given in this so.
Or if you really need to pass numbers to format, you can convert your binary representation to BigInteger and then format that with leading zeros, but this is very costly at runtime, as in:
String.format("%016d", new BigInteger(Integer.toBinaryString(1)))
Here a new answer for an old post.
To pad a binary value with leading zeros to a specific length, try this:
Integer.toBinaryString( (1 << len) | val ).substring( 1 )
If len = 4 and val = 1,
Integer.toBinaryString( (1 << len) | val )
returns the string "10001", then
"10001".substring( 1 )
discards the very first character. So we obtain what we want:
"0001"
If val is likely to be negative, rather try:
Integer.toBinaryString( (1 << len) | (val & ((1 << len) - 1)) ).substring( 1 )
You can use Apache Commons StringUtils. It offers methods for padding strings:
StringUtils.leftPad(Integer.toBinaryString(1), 16, '0');
I was trying all sorts of method calls that I haven't really used before to make this work, they worked with moderate success, until I thought of something that is so simple it just might work, and it did!
I'm sure it's been thought of before, not sure if it's any good for long string of binary codes but it works fine for 16Bit strings. Hope it helps!! (Note second piece of code is improved)
String binString = Integer.toBinaryString(256);
while (binString.length() < 16) { //pad with 16 0's
binString = "0" + binString;
}
Thanks to Will on helping improve this answer to make it work with out a loop.
This maybe a little clumsy but it works, please improve and comment back if you can....
binString = Integer.toBinaryString(256);
int length = 16 - binString.length();
char[] padArray = new char[length];
Arrays.fill(padArray, '0');
String padString = new String(padArray);
binString = padString + binString;
A simpler version of user3608934's idea "This is an old trick, create a string with 16 0's then append the trimmed binary string you got ":
private String toBinaryString32(int i) {
String binaryWithOutLeading0 = Integer.toBinaryString(i);
return "00000000000000000000000000000000"
.substring(binaryWithOutLeading0.length())
+ binaryWithOutLeading0;
}
I do not know "right" solution but I can suggest you a fast patch.
String.format("%16s", Integer.toBinaryString(1)).replace(" ", "0");
I have just tried it and saw that it works fine.
Starting with Java 11, you can use the repeat(...) method:
"0".repeat(Integer.numberOfLeadingZeros(i) - 16) + Integer.toBinaryString(i)
Or, if you need 32-bit representation of any integer:
"0".repeat(Integer.numberOfLeadingZeros(i != 0 ? i : 1)) + Integer.toBinaryString(i)
try...
String.format("%016d\n", Integer.parseInt(Integer.toBinaryString(256)));
I dont think this is the "correct" way to doing this... but it works :)
I would write my own util class with the method like below
public class NumberFormatUtils {
public static String longToBinString(long val) {
char[] buffer = new char[64];
Arrays.fill(buffer, '0');
for (int i = 0; i < 64; ++i) {
long mask = 1L << i;
if ((val & mask) == mask) {
buffer[63 - i] = '1';
}
}
return new String(buffer);
}
public static void main(String... args) {
long value = 0b0000000000000000000000000000000000000000000000000000000000000101L;
System.out.println(value);
System.out.println(Long.toBinaryString(value));
System.out.println(NumberFormatUtils.longToBinString(value));
}
}
Output:
5
101
0000000000000000000000000000000000000000000000000000000000000101
The same approach could be applied to any integral types. Pay attention to the type of mask
long mask = 1L << i;
A naive solution that work would be
String temp = Integer.toBinaryString(5);
while (temp.length() < Integer.SIZE) temp = "0"+temp; //pad leading zeros
temp = temp.substring(Integer.SIZE - Short.SIZE); //remove excess
One other method would be
String temp = Integer.toBinaryString((m | 0x80000000));
temp = temp.substring(Integer.SIZE - Short.SIZE);
This will produce a 16 bit string of the integer 5
// Below will handle proper sizes
public static String binaryString(int i) {
return String.format("%" + Integer.SIZE + "s", Integer.toBinaryString(i)).replace(' ', '0');
}
public static String binaryString(long i) {
return String.format("%" + Long.SIZE + "s", Long.toBinaryString(i)).replace(' ', '0');
}
This is an old trick, create a string with 16 0's then append the trimmed binary string you got from String.format("%s", Integer.toBinaryString(1)) and use the right-most 16 characters, lopping off any leading 0's. Better yet, make a function that lets you specify how long of a binary string you want. Of course there are probably a bazillion other ways to accomplish this including libraries, but I'm adding this post to help out a friend :)
public class BinaryPrinter {
public static void main(String[] args) {
System.out.format("%d in binary is %s\n", 1, binaryString(1, 4));
System.out.format("%d in binary is %s\n", 128, binaryString(128, 8));
System.out.format("%d in binary is %s\n", 256, binaryString(256, 16));
}
public static String binaryString( final int number, final int binaryDigits ) {
final String pattern = String.format( "%%0%dd", binaryDigits );
final String padding = String.format( pattern, 0 );
final String response = String.format( "%s%s", padding, Integer.toBinaryString(number) );
System.out.format( "\npattern = '%s'\npadding = '%s'\nresponse = '%s'\n\n", pattern, padding, response );
return response.substring( response.length() - binaryDigits );
}
}
This method converts an int to a String, length=bits. Either padded with 0s or with the most significant bits truncated.
static String toBitString( int x, int bits ){
String bitString = Integer.toBinaryString(x);
int size = bitString.length();
StringBuilder sb = new StringBuilder( bits );
if( bits > size ){
for( int i=0; i<bits-size; i++ )
sb.append('0');
sb.append( bitString );
}else
sb = sb.append( bitString.substring(size-bits, size) );
return sb.toString();
}
You can use lib https://github.com/kssource/BitSequence. It accept a number and return bynary string, padded and/or grouped.
String s = new BitSequence(2, 16).toBynaryString(ALIGN.RIGHT, GROUP.CONTINOUSLY));
return
0000000000000010
another examples:
[10, -20, 30]->00001010 11101100 00011110
i=-10->00000000000000000000000000001010
bi=10->1010
sh=10->00 0000 0000 1010
l=10->00000001 010
by=-10->1010
i=-10->bc->11111111 11111111 11111111 11110110
for(int i=0;i<n;i++)
{
for(int j=str[i].length();j<4;j++)
str[i]="0".concat(str[i]);
}
str[i].length() is length of number say 2 in binary is 01 which is length 2
change 4 to desired max length of number. This can be optimized to O(n).
by using continue.
import java.util.Scanner;
public class Q3{
public static void main(String[] args) {
Scanner scn=new Scanner(System.in);
System.out.println("Enter a number:");
int num=scn.nextInt();
int numB=Integer.parseInt(Integer.toBinaryString(num));
String strB=String.format("%08d",numB);//makes a 8 character code
if(num>=1 && num<=255){
System.out.println(strB);
}else{
System.out.println("Number should be in range between 1 and 255");
}
}
}
String message= "10";
byte[] bytes = message.getBytes();
for (int n = 0; n < bytes.length; n++) {
byte b = bytes[n];
for (int i = 0; i < 8; i++) {//do something for each bit in my byte
boolean bit = ((b >> (7 - i) & 1) == 1);
}
}
My problem here is that it takes 1 and 0 as their ASCII values, 49 and 48, instead of 1 and 0 as binary(00000001 and 00000000). How can I make my program treat each character from my string as a binary sequence of 8 bits?
Basicly, I want to treat each bit of my number as a byte. I do that like this byte b = bytes[n]; but the program treats it as the ASCII value.
I could assign the number to an int, but then, I can't assign the bits to a byte.
It's a bit messy, but the first thing that comes to mind is to first, split your message up into char values, using the toCharArray() method. Next, use the Character.getNumericValue() method to return the int, and finally Integer.toBinaryString.
Example
String message = "123456";
for(char c : message.toCharArray())
{
int numVal = Character.getNumericValue(c);
String binaryString = Integer.toBinaryString(numVal);
for(char bit : binaryString)
{
// Do something with your bits.
}
}
String msg = "1234";
for(int i=0 ; i<msg.length() ; i++ ){
String bits = Integer.toBinaryString(Integer.parseInt(msg.substring(i, i+1)));
for(int j=0;j<8-bits.length();j++)
bits = "0"+bits;
}
Now bits is a string of length 8.
1
00000001
10
00000010
11
00000011
100
00000100
You can use getBytes() on the String
Use Java's parseInt(String s, int radix):
String message= "10";
int myInt = Integer.parseInt(message, 2); //because we are parsing it as base 2
At that point you have the correct sequence of bits, and you can do your bit-shifting.
boolean[] bits = new boolean[message.length()];
System.out.println("Parsed bits: ");
for (int i = message.length()-1; i >=0 ; i--) {
bits[i] = (myInt & (1 << i)) != 0;
System.out.print(bits[i] ? "1":"0");
}
System.out.println();
You could make it bytes if you really want to, but booleans are a better representation of bits...
int[] LETTERS = {0x69F99}
I want to convert every single hex digit to binary, for example the 1st hex digit from the 1st hex string (6):
String hex = Integer.toHexString(LETTERS[0]);
String binary = Integer.toBinaryString(hex.charAt(0));
System.out.println(binary);
OUTPUT:110110
If I do this Integer.toBinaryString(6) the output will be 110, but I want something with 4 digits, is it possible?
I'd just pad the string as appropriate with your favorite library or a utility function.
With Guava:
String binary = Strings.padStart(Integer.toBinaryString(hex.charAt(0)), 4, '0'));
Another option would be to simply fill a character buffer and render it as a string, which is essentially what the OpenJDK implementation does:
public static String intToBin(int num) {
char[] buf = new char[4];
buf[0] = num & 0x1;
buf[1] = num & 0x2;
buf[2] = num & 0x4;
buf[3] = num & 0x8;
return new String(buf);
}
You have no string here - just an array with one int so you essentially try to convert this integer into nibbles and this can be done this way:
int num = 0x12345678;
String bin32 = String.format("%32s", Integer.toBinaryString(num)).replace(" ", "0");
System.out.printf("all 32bits=[%s]\n", bin32);
for(int nibble = 0; nibble < 32; nibble += 4)
{
System.out.printf("nibble[%d]=[%s]\n", nibble, bin32.subSequence(nibble, nibble+4));
}
gives:
all 32bits=[00010010001101000101011001111000]
nibble[0]=[0001] ie hex digit 1 as bin
nibble[4]=[0010] ie hex digit 2 as bin
nibble[8]=[0011]
nibble[12]=[0100]
nibble[16]=[0101]
nibble[20]=[0110]
nibble[24]=[0111]
nibble[28]=[1000] ie hex digit 8 as bin
First of all i receive a hex color code from a parameter 'col'. I then convert this value to the binary equivalent and then need to flip all the bits and convert it back to the hex value. Then the hex value needs to be padded out to 6 characters.
public String invertColor(String col)
{
String inverted = col;
int i = Integer.parseInt(inverted, 16);
String bin = Integer.toBinaryString(i);
System.out.println(bin);
int binary = Integer.parseInt(bin,2);
System.out.println(binary);
return inverted;
}
This is the code i have so far, i have been racking my brains all morning and just cannot seem to get a working solution. Any help at all would be appreciated.
Thanks
Use the bitwise not operator, ~.
int flipped = ~i;
Are we counting all the 0's preceding the binary representation in 32 bits, or do we only take the binary representation with no preceding 0's? Because that makes a difference when flipping. If it's the former, you can just use the operator ~.
int flip = ~i;
But if it's the second one, there's a little more work to do.
public String invertColor(String col)
{
String inverted = col;
int i = Integer.parseInt(inverted, 16);
String bin = Integer.toBinaryString(i);
String flipped = "";
for (int j = 0; j < bin.length(); j++) {
if (bin.charAt(j) == '0') flipped += "1";
else flipped += "0";
}
int k = Integer.parseInt(flipped, 2);
inverted = Integer.toHexString(k);
return inverted;
}
This should work. Basically this code builds a string by concatenating 1 if the current character is 0, and 0 otherwise. Then k is the integer represented by the flipped string, and inverted is the hex value.
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().
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.
String.format("%02X", (0xFF & value));
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();
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);
}
i use this to get a string representing the equivalent hex value of an integer separated by space for every byte
EX : hex val of 260 in 4 bytes = 00 00 01 04
public static String getHexValString(Integer val, int bytePercision){
StringBuilder sb = new StringBuilder();
sb.append(Integer.toHexString(val));
while(sb.length() < bytePercision*2){
sb.insert(0,'0');// pad with leading zero
}
int l = sb.length(); // total string length before spaces
int r = l/2; //num of rquired iterations
for (int i=1; i < r; i++){
int x = l-(2*i); //space postion
sb.insert(x, ' ');
}
return sb.toString().toUpperCase();
}
public static void main(String []args){
System.out.println("hex val of 260 in 4 bytes = " + getHexValString(260,4));
}
According to GabrielOshiro, If you want format integer to length 8, try this
String.format("0x%08X", 20) //print 0x00000014