Can you help me? I am making a math program to help my son. I would like to be able to use radio buttons to represent numbers and then have the result of his choices appear in a text field. I am using g4p gui tool but am open to other libraries if you recommend. Thank you muchly.

main code

2. /* =========================================================
3.  * ====                   WARNING                        ===
4.  * =========================================================
5.  * The code in this tab has been generated from the GUI form
6.  * designer and care should be taken when editing this file.
7.  * Only add/edit code inside the event handlers i.e. only
8.  * use lines between the matching comment tags. e.g.
9. 
   
10.  void myBtnEvents(GButton button) { //_CODE_:button1:12356:
11.      // It is safe to enter your event code here  
12.  } //_CODE_:button1:12356:
13.  
14.  * Do not rename this tab!
15.  * =========================================================
16.  */
17. 
    
18. void option1_Click1(GOption opt_selected, GOption opt_deselected) { //_CODE_:one:233963:
19.   println("option1 - GOption event occured " + System.currentTimeMillis()000000 );
20.  GTextField.result=2;
21. } //_CODE_:one:233963:
22. 
    
23. void option2_Click1(GOption opt_selected, GOption opt_deselected) { //_CODE_:two:593628:
24.   println("option2 - GOption event occured " + System.currentTimeMillis()000000 );
25. } //_CODE_:two:593628:
26. 
    
27. void option3_Click1(GOption opt_selected, GOption opt_deselected) { //_CODE_:three:842041:
28.   println("option3 - GOption event occured " + System.currentTimeMillis()000000 );
29. } //_CODE_:three:842041:
30. 
    
31. void option4_Click1(GOption opt_selected, GOption opt_deselected) { //_CODE_:four:648498:
32.   println("option4 - GOption event occured " + System.currentTimeMillis()000000 );
33. } //_CODE_:four:648498:
34. 
    
35. void textfield1_Enter1(GTextField textfield) { //_CODE_:result:239776:
36.   println("textfield1 - GTextField event occured " + System.currentTimeMillis()000000 );
37. } //_CODE_:result:239776:
38. 
    
39. 
    
40. 
    
41. // Create all the GUI controls. 
42. // autogenerated do not edit
43. void createGUI(){
44.   G4P.setColorScheme(this, GCScheme.BLUE_SCHEME);
45.   G4P.messagesEnabled(false);
46.   optGroup1 = new GOptionGroup();
47.   one = new GOption(this, "1", 13, 74, 90);
48.   optGroup1.addOption(one);
49.   one.setSelected(true);
50.   one.addEventHandler(this, "option1_Click1");
51.   two = new GOption(this, "2", 13, 112, 90);
52.   optGroup1.addOption(two);
53.   two.addEventHandler(this, "option2_Click1");
54.   optGroup2 = new GOptionGroup();
55.   three = new GOption(this, "3", 141, 73, 90);
56.   optGroup2.addOption(three);
57.   three.setSelected(true);
58.   three.addEventHandler(this, "option3_Click1");
59.   four = new GOption(this, "4", 140, 114, 90);
60.   optGroup2.addOption(four);
61.   four.addEventHandler(this, "option4_Click1");
62.   result = new GTextField(this, "result", 269, 90, 80, 20, false);
63.   result.addEventHandler(this, "textfield1_Enter1");
64. }
65. 
    
66. // Variable declarations 
67. // autogenerated do not edit
68. GOptionGroup optGroup1; 
69. GOption one; 
70. GOption two; 
71. GOptionGroup optGroup2; 
72. GOption three; 
73. GOption four; 
74. GTextField result; 
75.