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    <p>Here's a more efficient and perfect solution to your problem:</p> <pre><code>import java.io.*; import javax.swing.JOptionPane; public class MyType { public static void main(String[] args) { // declare class variables String strChoice=""; // you didn't need the other variables Integer choice, tryInt; double tryDouble; boolean done = false; // loop while not done while(!done) { try { strChoice = JOptionPane.showInputDialog(null, "What's my type\n\n\n1) String\n2) integer\n3) double\n4) Quit the program"); if(strChoice.equals("")) // refuses blank answers, must enter a choice { JOptionPane.showMessageDialog(null,"Please enter a 1, 2, 3, or 4.","Error",JOptionPane.INFORMATION_MESSAGE); continue; } choice = Integer.parseInt(strChoice); if(choice !=4) // so the input dialog doesn't appear when choice is 4 strChoice = JOptionPane.showInputDialog(null,strChoice); switch(choice) { case 1: JOptionPane.showMessageDialog(null, "Correct, any input can be saved as a String."); break; case 2: tryInt = Integer.parseInt(strChoice); JOptionPane.showMessageDialog(null, "Correct."); break; case 3: tryDouble = Double.parseDouble(strChoice); JOptionPane.showMessageDialog(null, "Correct."); break; case 4: done = true; JOptionPane.showMessageDialog(null, "The program will now close."); break; default: { if((choice &gt; 4) || (choice == null)) // must be 1 - 4, &amp; not blank JOptionPane.showMessageDialog(null,"Please enter a 1, 2, 3, or 4.","Error",JOptionPane.INFORMATION_MESSAGE); } } } catch(NumberFormatException e) // this should ONLY occur when type is wrong { JOptionPane.showMessageDialog(null,"Your input can't be stored into that type.","Error",JOptionPane.INFORMATION_MESSAGE); } } } } </code></pre> <p>Also, in the cases, you are supposed to parse <code>strChoice</code>, not <code>choice</code>. <code>choice</code> is was already converted to an int before, so it wouldn't be a good comparison. Using <code>strString</code> truly compares the user input against the type. </p> <p>I also changed <code>int</code> to <code>Integer</code>, <code>int</code> is a primitive data type and can't be checked for <code>null</code> values. <code>Integer</code> can do all that <code>int</code> can, but it's an object, and objects can be null. If choice happens to be <code>null</code> we can check for it and do something about it.</p> <p>While the answer you accepted is not wrong, the code is too repetitive (not a good programming practice), and is a great departure from your original code. There were exceptions when the 'error' message didn't fit the description of what really was wrong. Also, the program got a lot more complex: in programming simpler is better.</p> <p>Hope this helps! Let me know if you have any questions!</p> <p>Cheers! :)</p> <p>JLL </p>
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