Convert a RGB Color Value to a Hexadecimal String

Question

In my Java application  I was able to get the Color of a JButton in terms of red  green and blue  I have stored these values in three ints   How do I convert those RGB values into a String containing the equivalent hexadecimal representation  Such as  0033fA

User · Accepted Answer

You can use   String hex   String format    02x 02x 02x   r  g  b       Use capital X s if you want your resulting hex-digits to be capitalized   FFFFFF vs   ffffff

User · Answer

This is an adapted version of the answer given by Vivien Barousse with the update from Vulcan applied  In this example I use sliders to dynamically retreive the RGB values from three sliders and display that color in a rectangle  Then in method toHex   I use the values to create a color and display the respective Hex color code       This example does not include the proper constraints for the GridBagLayout  Though the code will work  the display will look strange     public class HexColor      public static void main  String   args         JSlider sRed   new JSlider 0 255 1      JSlider sGreen   new JSlider 0 255 1      JSlider sBlue   new JSlider 0 255 1      JLabel hexCode   new JLabel       JPanel myPanel   new JPanel       GridBagLayout layout   new GridBagLayout       JFrame frame   new JFrame          set frame to organize components using GridBagLayout     frame setLayout layout         create gray filled rectangle     myPanel paintComponent       myPanel setBackground Color GRAY         In practice this code is replicated and applied to sGreen and sBlue        For the sake of brevity I only show sRed in this post     sRed addChangeListener           new ChangeListener                            Override              public void stateChanged ChangeEvent e                    myPanel setBackground changeColor                      myPanel repaint                     hexCode setText toHex                                        add each component to JFrame    frame add myPanel      frame add sRed      frame add sGreen      frame add sBlue      frame add hexCode       end of main      creates JPanel filled rectangle   protected void paintComponent Graphics g            super paintComponent g         g drawRect 360  300  10  10         g fillRect 360  300  10  10            changes the display color in JPanel   private Color changeColor           int r   sRed getValue        int b   sBlue getValue        int g   sGreen getValue        Color c      return  c   new Color r g b            Displays hex representation of displayed color   private String toHex             Integer r   sRed getValue          Integer g   sGreen getValue          Integer b   sBlue getValue          Color hC        hC   new Color r g b         String hex   Integer toHexString hC getRGB    amp  0xffffff         while hex length    lt  6             hex    0    hex                hex    Hex Code       hex        return hex          A huge thank you to both Vivien and Vulcan  This solution works perfectly and was super simple to implement

User · Answer

Random ra   new Random    int r  g  b  r ra nextInt 255   g ra nextInt 255   b ra nextInt 255   Color color   new Color r g b   String hex   Integer toHexString color getRGB    amp  0xffffff   if  hex length    lt  6        hex    0    hex    hex         hex

User · Answer

A one liner but without String format for all RGB colors  Color your color   new Color 128 128 128    String hex    quot   quot  Integer toHexString your color getRGB    substring 2    You can add a  toUpperCase  if you want to switch to capital letters  Note  that this is valid  as asked in the question  for all RGB colors  When you have ARGB colors you can use  Color your color   new Color 128 128 128 128    String buf   Integer toHexString your color getRGB     String hex    quot   quot  buf substring buf length  -6    A one liner is theoretically also possible but would require to call toHexString twice  I benchmarked the ARGB solution and compared it with String format

[java] Convert a RGB Color Value to a Hexadecimal String

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