1    package utils; 
2     
3     
4    public class IO { 
5      public static void show(Object s) { 
6        javax.swing.JOptionPane.showMessageDialog(null, s); 
7      } 
8     
9      public static String getString(Object o) { 
10       return javax.swing.JOptionPane.showInputDialog(o); 
11     } 
12    
13     public static int getInt(Object o) { 
14       String s = getString(o); 
15       try { 
16         return Integer.parseInt(s); 
17       } catch (NumberFormatException e) { 
18         return getInt(s + " is not an int!" + o); 
19       } 
20     } 
21    
22     public static double getDouble(Object o) { 
23       String s = getString(o); 
24       try { 
25         Double d = Double.valueOf(s); 
26         return d.doubleValue(); 
27       } catch (NumberFormatException e) { 
28         return getDouble(s + " is not a double!" + o); 
29       } 
30     } 
31    
32     public static void main(String args[]) { 
33       show( 
34           "Hello " + 
35           getString("Please Enter your name:")); 
36       show("age=" + 
37            getInt("Enter your age:")); 
38     } 
39   }