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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12.     Scanner input = new Scanner(System.in);
  13.     // Link user to programs (ToC)
  14.     int loop = 1;
  15.  
  16.     do {
  17.         try {
  18.             System.out.println("Please choose a number: ");
  19.             System.out.println("0. Exit");
  20.             System.out.println("1. Calculator");
  21.             int numChoice = input.nextInt();
  22.             if (numChoice == 0) {
  23.                 System.exit(0);
  24.             } else if (numChoice == 1) {
  25.                 System.out.println("Going to Calculator...");
  26.                 break;
  27.             } else {
  28.                 System.out.println("Not a valid choice.");
  29.             }
  30.         }
  31.         catch (Exception e) {
  32.             System.out.println("Please input a number!");
  33.             input.next();
  34.         }
  35.     } while (loop == 1);
  36.     System.out.println("Done");
  37. 	}
  38. }
Success #stdin #stdout 0.11s 380672KB
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stdin
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stdout
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Please choose a number: 
0. Exit
1. Calculator
Please input a number!
Please choose a number: 
0. Exit
1. Calculator
Please input a number!
Please choose a number: 
0. Exit
1. Calculator
Going to Calculator...
Done
https://ideone.com/ilRt2r
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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