Change component default fontTag(s): Swing


public static void setUIFont (javax.swing.plaf.FontUIResource f){
    //
    // sets the default font for all Swing components.
    // ex.
    //  setUIFont (new javax.swing.plaf.FontUIResource
    //   ("Serif",Font.ITALIC,12));
    //
    java.util.Enumeration keys = UIManager.getDefaults().keys();
    while (keys.hasMoreElements()) {
      Object key = keys.nextElement();
      Object value = UIManager.get (key);
      if (value instanceof javax.swing.plaf.FontUIResource)
        UIManager.put (key, f);
      }
    }
For a particuliar component
UIManager.put("Label.font",new Font("Serif",Font.ITALIC,12));
Swing UI default
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