Reading characters without having them show up on the screen?

[alexsb92]

Hey guys,

I am trying to read a character in Java without having it show up on the screen. It is possible with the hsa class, but i absolutely hate ready to program, and I do not want to use it. Is there any way to do that with Standard Java libraries? Basically I am looking for the Java equivalent of readkey that is found in Pascal.

Thanks

[TerranceN]

I don't know what readkey is in Pascal so I hope this is what you mean. Look into the KeyListener and KeyEvent classes. If you implement KeyListener in your class then you can use the KeyTyped method to get the KeyEvent. Also, in order for it to get key events you need to add it to a Component using addKeyListener. Here is an example:

Java:

import java.awt.*; import java.awt.event.KeyEvent; import java.awt.event.KeyListener; // This class is both a Component (because it inherits frame) and a KeyListener (because it implements KeyListener) public class KeyTypedExample extends Frame implements KeyListener {     // Entry point for program     public static void main(String[] args)     {         // Creates a new instance         KeyTypedExample keyTypedExample = new KeyTypedExample();     }         // Constructor for class     public KeyTypedExample()     {         // sets size and makes window visible         setSize(500, 500);         setVisible(true);                 // assigns its own key listener to itself         addKeyListener(this);     }         // This is triggered whenever a key is pressed then released     public synchronized void keyTyped(KeyEvent e)     {         // Prints the char representation of what was pressed         System.out.println(e.getKeyChar());     }             // These methods are not used, but have to be defined because of KeyListener     public synchronized void keyPressed(KeyEvent e){}     public synchronized void keyReleased(KeyEvent e){} }

Hope that helps.

[TheGuardian001]

If you don't want a GUI one, I believe java.io.Console has a readPassword method which doesn't echo. It returns an array of characters though, so you'd have to put it in a string yourself. to set it as the default console input, use

code:

myConsole = System.console();