Este código permite cambiar de ventana a Google Chrome, entrar a google y buscar algo. Usa la clase de testing Robot de Java

RobotTest.java

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

public class robo_test 
{
	
	Robot rob;
	
	public robo_test() throws AWTException
	{
		rob = new Robot();
		rob.delay(2000);
		
		// Cambiar de ventana
		rob.keyPress(KeyEvent.VK_ALT);
		
		rob.keyPress(KeyEvent.VK_TAB);
		rob.keyRelease(KeyEvent.VK_TAB);
		
		rob.keyRelease(KeyEvent.VK_ALT);
		
		System.out.println("Changing the window...");
		rob.delay(1500);
		
		// Dar el foco a la barra de navegacion
		rob.keyPress(KeyEvent.VK_F6);
		rob.keyRelease(KeyEvent.VK_F6);
		
		System.out.println("Setting focus on address bar...");
		
		rob.delay(500);
		
		String url = "google.com";
		String criteria = "como matar a tu novia con un lapiz sin punta";
		
		for(int i=0;i<url.length();i++)
		{
			rob.delay(150);
			
			if(Character.isLetterOrDigit(url.charAt(i)))
			{
				rob.keyPress((int)Character.toUpperCase(url.charAt(i)));
				rob.keyRelease((int)Character.toUpperCase(url.charAt(i)));
			}
			else
			{
				rob.keyPress((int)url.charAt(i));
				rob.keyRelease((int)url.charAt(i));
			}
		}
		
		rob.keyPress(KeyEvent.VK_ENTER);
		rob.keyRelease(KeyEvent.VK_ENTER);
		
		rob.delay(4000);
		
		for(int i=0;i<criteria.length();i++)
		{
			rob.delay(150);
			
			if(Character.isLetterOrDigit(criteria.charAt(i)))
			{
				rob.keyPress((int)Character.toUpperCase(criteria.charAt(i)));
				rob.keyRelease((int)Character.toUpperCase(criteria.charAt(i)));
			} 
			else
			{
				rob.keyPress((int)criteria.charAt(i));
				rob.keyRelease((int)criteria.charAt(i));
			}
		}
		
		rob.keyPress(KeyEvent.VK_ENTER);
		rob.keyRelease(KeyEvent.VK_ENTER);
	}
	
	public static void main(String _[]) throws AWTException	
	{
		robo_test x = new robo_test();
	}
}