src/lab6_Hangman/Dialogs.java

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+package lab6_Hangman;
+import javax.swing.JFrame;
+import javax.swing.JOptionPane;
+import javax.swing.JPasswordField;
+
+/**
+ * This class allows to display simple messages and have graphical interfaces to
+ * enter words and characters.
+ * 
+ * @version 2.0
+ * 
+ */
+public class Dialogs {
+	/**
+	 * This function open a dialog box to enter a hidden String. The dialog box
+	 * asks for a String containing a minimum of one character.
+	 * 
+	 * @param message
+	 *            The message displayed to ask for the hidden String
+	 * @return The hidden String entered
+	 */
+	public static String getHiddenString(String message) {
+		JPasswordField passwordField = new JPasswordField(10);
+		JFrame frame = new JFrame(message);
+	    // prompt the user to enter their name
+	    JOptionPane.showMessageDialog(frame, passwordField, message, JOptionPane.PLAIN_MESSAGE);
+		
+		String s = new String(passwordField.getPassword());
+		if (s.length() > 0)
+			return s;
+		else
+			return getHiddenString("Enter at least one character");
+	}
+
+	/**
+	 * This function open a dialog box to enter a character. This function
+	 * accepts only one character.
+	 * 
+	 * @param message
+	 *            The message asking for the character.
+	 * @return The character entered.
+	 */
+	public static char getChar(String message) {
+	    JFrame frame = new JFrame("Input a character please");
+	    // prompt the user to enter their name
+	    String s = JOptionPane.showInputDialog(frame, message);	    
+	    
+	    if(s == null){
+	    	System.exit(-1);
+	    }
+	    
+		if (s.length() == 1)
+			return s.charAt(0);
+		else
+			return getChar("Just one character");
+	}
+
+	/**
+	 * Open a dialog box to display a message.
+	 * 
+	 * @param message
+	 *            The message to display.
+	 */
+	public static void displayMessage(String message) {
+		JOptionPane.showMessageDialog(null, message, null, JOptionPane.PLAIN_MESSAGE);
+	}
+
+}