Need help with a menu button in a game

[pjr5043]

hello, i am working on a video game for my class. i have an option menu that lets you select a character, then you hit the play button and it goes into the game. the problem is if i don't select a character i can still hit play, but then there is no character in the game. i am having trouble writing the correct if statements so that i cannot hit play until i have selected a character here is the code, the play button is the (opt.play) and the charcters are (opt.jb1-jb3) they are radio buttons.

    }
      public void actionPerformed(ActionEvent e)
    {
    	Object obj = e.getSource();
    	
    	if (obj==set.info)
    	{
    		remove(set);
    		add(ins);
    		validate();
    		repaint(); 
    	}
    	if (obj==set.play)
    	{
    		remove(set);
    		add(opt);
    		validate();
    		repaint(); 
    	}
    	if (obj==set.score)
    	{
    		remove(set);
    		add(sco);
    		validate();
    		repaint();
    	}
    	if(obj == opt.play)
		{
		    remove(opt);
    		add(gam);
    		validate();
    		repaint(); 
    
    		
		}
		if(obj ==ins.back)
		{
			remove(ins);
			add(set);
    		validate();
    		repaint();
		}
		if(obj==sco.back)
		{
			remove(sco);
			add(set);
    		validate();
    		repaint();
		}
		if(obj==gam.back)
		{
			remove(gam);
			add(set);
    		validate();
    		repaint();
		}
		if(obj==opt.back)
		{
			remove(opt);
			add(set);
    		validate();
    		repaint();
		}
		
    	if(obj==opt.jb1)
		{
		gam.width=50;
  		gam.height=34;
  		gam.b5.setIcon(imagelogo);
  		
		}
		if(obj==opt.jb2)
		{
  		gam.width=50;
  		gam.height=83;
  		gam.b5.setIcon(imagelion);

		}
		if(obj==opt.jb3)
		{
  		gam.width=50;
  		gam.height=118;
  		gam.b5.setIcon(imagejoe);

		}

[Fubarable]

How about disabling the play button initially and then enable it only after a character radio button has been selected. You disable the play button with

play.setEnabled(false);

and enable it with setEnabled(true). Also, I recommend that you use more than one ActionListener here as you should have buttons share action listeners only if they share the same or very similar actions.

Good luck and HTH.