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copied!<p>JComboBox UI is composed from textfield, list and arrows. To customize them you can use some ready L&F or implement your most easily with Synth L&F.</p> <p>Initialize L&F:</p> <pre><code>SynthLookAndFeel lookAndFeel = new SynthLookAndFeel(); try { lookAndFeel.load(YourClassAlongWithSynthXml.class.getResourceAsStream("synth.xml"), YourClassAlongWithSynthXml.class); } catch (ParseException e) { e.printStackTrace(); } UIManager.setLookAndFeel(lookAndFeel); </code></pre> <p>Where synth.xml contains something like this:</p> <pre><code><style id="textfield"> <insets top="4" left="6" bottom="4" right="6" /> <state> <font name="Verdana" size="12" />  <color type="TEXT_FOREGROUND" value="#003c2d" /> </state> <imagePainter method="textFieldBorder" path="images/textfield.png" sourceInsets="4 6 4 6" paintCenter="false" /> </style> <bind style="textfield" type="region" key="TextField" /> <style id="arrowStyle"> <imagePainter method="arrowButtonForeground" path="images/arrow-up.png" sourceInsets="0 0 0 0" stretch="false" direction="north" /> <imagePainter method="arrowButtonForeground" path="images/arrow-down.png" sourceInsets="0 0 0 0" stretch="false" direction="south" /> <imagePainter method="arrowButtonForeground" path="images/arrow-left.png" sourceInsets="0 0 0 0" stretch="false" direction="west" /> <imagePainter method="arrowButtonForeground" path="images/arrow-right.png" sourceInsets="0 0 0 0" stretch="false" direction="east" /> </style> <bind key="ArrowButton" type="region" style="arrowStyle" /> <style id="comboArrowStyle"> <imagePainter method="arrowButtonForeground" path="images/combobox-arrow.png" sourceInsets="0 0 0 0" stretch="false" direction="south" /> </style> </code></pre> <p>With Synth L&F you will need to fully define how your UI components look like you can't just.</p> <p>But if you just need to simply modify colors reusing your default L&F, you can use the following snippets to initialize UI of combo box:</p> <pre><code>final Color COLOR_BUTTON_BACKGROUND = Color.decode("#d3dedb"); UIManager.put("ComboBox.buttonBackground", COLOR_BUTTON_BACKGROUND); UIManager.put("ComboBox.buttonShadow", COLOR_BUTTON_BACKGROUND); UIManager.put("ComboBox.buttonDarkShadow", COLOR_BUTTON_BACKGROUND); UIManager.put("ComboBox.buttonHighlight", COLOR_BUTTON_BACKGROUND); </code></pre>

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