CODEWITHSUNDEEP
javaexceptionimportawt
Nightmare FNaF
Nightmare FNaF

Reputation: 11

Send Keyboard Outputs

I wanted to create a keyboard output API type thing so that I could make a machine learning program for Tetris, and I tried:

import java.awt.*;

public class Keyboard
{
    public static void main( String[] args )
    {
        Robot keyboard = new Robot();
        keyboard.keyPress(KeyEvent.VK_A);

    }

}

but it has an error for new Robot(), it says "Unhandled exception: java.awt.AWTException". and it has an error on the line after that: "Cannot resolve symbol 'KeyEvent'", even though I have import java.awt.*;. what am I doing wrong?

Upvotes: 1

Views: 126

Answers (1)

Minepolz320
Minepolz320

Reputation: 133

let's check what errors we getting.

Unhandled exception: java.awt.AWTException

This is means you don't handle an exception thrown from calling constructor new Robot(); you need to check this in documentation here: https://docs.oracle.com/javase/7/docs/api/java/awt/Robot.html or use your IDE its can show which exception can be thrown. To fix this we need to surround constructor call new Robot (); with try-catch block or declare an exception throw in a method main(); more about exceptions here: https://docs.oracle.com/javase/tutorial/essential/exceptions/

Cannot resolve symbol 'KeyEvent'

Its can means you missing some imports in your case you imported import java.awt.*; but this import does not include java.awt.event

//Don't use static (*) import just import what you need in this case
//or use your IDE auto import

import java.awt.Robot;
import java.awt.event.KeyEvent;
import java.awt.AWTException;

 public class MainClass {

   public static void main(String[] args) {

    try {
        Robot rob = new Robot();
        // Robot can throw an AWTException
        // we need surround him with try-catch block
        // Or declare exception throw in current method

        // Pressing button
        rob.keyPress(KeyEvent.VK_A);

        // Releasing button in case if we don't do that key may stay in press state
        rob.keyRelease(KeyEvent.VK_A);
    } catch (AWTException e) {
        // Process exception if something go wrong
        e.printStackTrace();
    }

}

Upvotes: 2

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