java - How can I make JRadioButton transparent in particular case? -

i have couple of jradiobutton: rb1, rb2; contained in transparent jpanel p1, , p1 contained in colorful panel, named mainpanel. want make these jradiobutton transparent , here do:

in mainpanel: mainpanel.setbackground(color.red);

in p1: p1.setbackground(new color(0,0,0,0));

and in rb1 , rb2:

rb1.setopaque(false);         rb1.setcontentareafilled(false);         rb1.setborderpainted(false);         rb2.setopaque(false);         rb2.setcontentareafilled(false);         rb2.setborderpainted(false); 

it's ok if rb1 , rb2 contained in mainpanel or if p1 isn't transparent jpanel, in case, outcome not expected:

how can resolve problem? in advance!

the weird painting artifacts you're seeing caused this:

p1.setbackground(new color(0,0,0,0)); 

with parent container not notified clear it's background , repaint. if want panel transparent, use setopaque(false) instead. need call method on radio buttons , nothing else.

setopaque notify parent repaint, if want semi-transparent panel, have override paintcomponent , call super.paintcomponent(graphics) manually.

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import java.awt.color; import java.awt.eventqueue;  import javax.swing.buttongroup; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.jradiobutton;  public class example {      public void createandshowgui() {             jradiobutton encryptbutton = new jradiobutton("encrypt");         encryptbutton.setopaque(false);          jradiobutton decryptbutton = new jradiobutton("decrypt");         decryptbutton.setopaque(false);          buttongroup group = new buttongroup();         group.add(encryptbutton);         group.add(decryptbutton);          jpanel subpanel = new jpanel();         subpanel.setopaque(false);         subpanel.add(encryptbutton);         subpanel.add(decryptbutton);          jpanel mainpanel = new jpanel();         mainpanel.setbackground(color.cyan);         mainpanel.add(subpanel);          jframe frame = new jframe();         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.setcontentpane(mainpanel);         frame.pack();         frame.setvisible(true);     }      public static void main(string[] args) {         eventqueue.invokelater(new runnable() {             @override             public void run() {                 new example().createandshowgui();             }         });     }  }