Java Moving robot Please do not use switch with this program

[Java] Moving robot

Please do not use switch with this program

We denote the robot\'s position with an arrow whose tip points to the direction in which it moves.

Robot will have following five operations:

Move forward. The robot moves one step forward, in the direction she is facing.

However, if you try to move Carol into a wall, she “crashes” (turns black and ceases to function). Don\'t do this.

Turn left. The robot turns 90 degrees to the left, staying at the same location.

Turn right. The robot turns 90 degrees to the right, staying at the same location.

Front has wall or window? Yields true if there is a wall or directly in front of the robot, false otherwise. (Her front sensor is a touch sensor that can\'t tell the difference between a wall or window)

Right has wall? Yields true if there is a wall directly to the right of the robot,false otherwise. (Her side sensor is an optical sensor that can\'t tell the difference between a window and empty space.)

Solution

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Robot03 extends JFrame implements ActionListener{ Robot robot; public static void main(String[] args){ new Robot03(); }//end main //-------------------------------------------// public Robot03(){//constructor //Instantiate and save a new Robot object try{ robot = new Robot(); }catch(AWTException e){e.printStackTrace();} //Prepare the JFrame for use setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); getContentPane().setLayout( new GridLayout(1,3)); setBounds(20,20,250,100); setTitle(\"Copyright 2003, R.G.Baldwin\"); //Create the buttons JToggleButton b1 = new JToggleButton( \"1\" ); JToggleButton b2 = new JToggleButton( \"2\" ); JToggleButton b3 = new JToggleButton( \"3\" ); //Add the buttons to the frame getContentPane().add(b1); getContentPane().add(b2); getContentPane().add(b3); //Register an action listener on each of // the buttons. b1.addActionListener(this); b2.addActionListener(this); b3.addActionListener(this); //Set look and feel String plafClassName = \"com.sun.java.swing.plaf.motif.\" + \"MotifLookAndFeel\"; try{ UIManager.setLookAndFeel(plafClassName); }catch(Exception ex){ex.printStackTrace();} //Cause the new L&F to apply SwingUtilities.updateComponentTreeUI(this); //Make the frame visible setVisible( true ); }//end constructor //-------------------------------------------// //Define the event handler that is registered // on each of the buttons. public void actionPerformed(ActionEvent e){ JToggleButton button = (JToggleButton)(e.getSource()); //Spawn a thread to handle the event and // return from the event handler method. new HandleEvent(button,this).start(); }//end actionPerformed //-------------------------------------------// //Objects of this inner Thread class are // spawned to handle action events on the // buttons. class HandleEvent extends Thread{ JToggleButton button; ActionListener listener; HandleEvent(JToggleButton button, ActionListener listener){ this.button = button; this.listener = listener; }//end constructor public void run(){ //Get the button\'s location. Point location = button.getLocationOnScreen(); //Disable action events on this button // until this process is complete. Don\'t // allow the robot to generate an action // event on this button. button.removeActionListener(listener); //Cause the mouse pointer to automatically // move across the screen and click on the // button that fired the event currently // being processed. This will un-select // the toggle button. mouseMoveAndClick(50,50, location.x + button.getWidth()/2, location.y + button.getHeight()/2); //Re-enable action events on this button button.addActionListener(listener); }//end run }//end class HandleEvent //-------------------------------------------// public void mouseMoveAndClick(int xStart, int yStart, int xLoc, int yLoc){ //Move the mouse pointer to the starting // position robot.mouseMove(xStart,yStart); //Change the cursor to a hand and delay setCursor(new Cursor(Cursor.HAND_CURSOR)); robot.delay(1000); //Use double precision to avoid cumulative // arithmetic errors. Calculate the // incremental distance for animated mouse // pointer movement. Make animation speed // appropriate for distance to be traveled. double div; if ((xLoc - xStart) < 50.0) div = 15; else if ((xLoc - xStart) < 100.0) div = 30; else div = 60; double xInc = (xLoc - xStart)/div; double yInc = (yLoc - yStart)/div; //Initialize, and then execute a loop to move // the mouse pointer from the starting // position to the center of the button. // Sleep for 60 msec between each movement. double x = xStart; double y = yStart; while(((int)x < xLoc) || ((int)y < yLoc)){ x += xInc; y += yInc; robot.mouseMove((int)x,(int)y); robot.delay(60); }//end while loop //Press and then release the left mouse // button when the mouse pointer is resting // in the location of the JToggleButton. robot.mousePress(InputEvent.BUTTON1_MASK); robot.mouseRelease(InputEvent.BUTTON1_MASK); //Return the cursor to the starting position // and restore it to a default pointer. robot.delay(1000); robot.mouseMove(xStart,yStart); setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); }//end mouseMoveAndClick //-------------------------------------------// }//end class definition