Type a String using java.awt.Robot

Question

Common solution is to use the clipboard:

String text = "Hello World";
StringSelection stringSelection = new StringSelection(text);
Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
clipboard.setContents(stringSelection, stringSelection);

Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_CONTROL);
robot.keyPress(KeyEvent.VK_V);
robot.keyRelease(KeyEvent.VK_V);
robot.keyRelease(KeyEvent.VK_CONTROL);

Since Java 7 you can also use KeyEvent.getExtendedKeyCodeForChar(c). An example for lower case only could be:

void sendKeys(Robot robot, String keys) {
    for (char c : keys.toCharArray()) {
        int keyCode = KeyEvent.getExtendedKeyCodeForChar(c);
        if (KeyEvent.CHAR_UNDEFINED == keyCode) {
            throw new RuntimeException(
                "Key code not found for character '" + c + "'");
        }
        robot.keyPress(keyCode);
        robot.delay(100);
        robot.keyRelease(keyCode);
        robot.delay(100);
    }
}

You need to "type" the character, which is a press AND release action...

robot.keyPress(KeyEvent.VK_1);  
robot.keyRelease(KeyEvent.VK_1);  

Now you could just copy and paste it three times, but I'd just put it in a loop

You can enter value in a string and then you can use that string as explained by Eng.Fouad. But there is no fun in using it, you can give a try to this

Robot robot = new Robot();
robot.keyPress(KeyEvent.VK_H);
robot.keyRelease(KeyEvent.VK_H);
robot.keyPress(KeyEvent.VK_E);
robot.keyRelease(KeyEvent.VK_E);
robot.keyPress(KeyEvent.VK_L);
robot.keyRelease(KeyEvent.VK_L);
robot.keyPress(KeyEvent.VK_L);
robot.keyRelease(KeyEvent.VK_L);
robot.keyPress(KeyEvent.VK_O);
robot.keyRelease(KeyEvent.VK_O);

and you can also use Thread.sleep so that it can enter data bit slowly.