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import becker.robots.City; import becker.robots.Direction; import becker.robots.RobotSE;

import becker.robots.City; import becker.robots.Direction; import becker.robots.RobotSE; import becker.robots.Thing; import becker.robots.Wall; public class NoBrainerRobot { public static void main(String[] args) { City ny = new City();

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import becker.robots.City; import becker.robots.Direction; import becker.robots.RobotSE;

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  1. import becker.robots.City; import becker.robots.Direction; import becker.robots.RobotSE; import becker.robots.Thing; import becker.robots.Wall; publicclass NoBrainerRobot { publicstaticvoid main(String[] args) { City ny = new City(); Thing parcel = new Thing(ny, 1, 6); Wall blockade1 = new Wall(ny,1,4,Direction.WEST); Wall blockade2 = new Wall(ny,1,4,Direction.EAST); Wall blockade3 = new Wall(ny,1,6,Direction.NORTH); Wall blockade4 = new Wall(ny,1,6,Direction.SOUTH); Wall blockade5 = new Wall(ny,1,6,Direction.WEST); RobotSE mark = new RobotSE(ny, 1, 0, Direction.EAST); 0 1 2 3 4 5 6 7 0 1 2 3 ITK 168

  2. import .... publicclass NoBrainerRobot { publicstaticvoid main(String[] args) { .... .... mark.move(); mark.move(); mark.move(); mark.move(); mark.move(); mark.move(); mark.move(); mark.move(); 0 1 2 3 4 5 6 7 ITK 168

  3. Rrobot V2 ITK 168

  4. import becker.robots.*; publicclass RobotV2 extends RobotSE { public RobotV2(City theCity, int aStreet, int anAvenue, Direction aDirection) { super(theCity, aStreet, anAvenue, aDirection); } publicvoid walkAroundToEast() { this.turnRight(); this.move(); this.turnLeft(); this.move(); this.turnLeft(); this.move(); this.turnRight(); } publicvoid walkAroundToWest() { this.turnLeft(); this.move(); this.turnRight(); this.move(); this.turnRight(); this.move(); this.turnLeft(); } } ITK 168

  5. import .... publicclass NoBrainerRobot { publicstaticvoid main(String[] args) { .... mark.move(); mark.move(); mark.move(); mark.walkAroundToEast(); mark.walkAroundToEast(); mark.move(); mark.pickThing(); mark.turnAround(); mark.move(); mark.walkAroundToWest(); mark.walkAroundToWest(); mark.move(); mark.move(); mark.move(); mark.putThing(); } } 0 1 2 3 4 5 6 7 ITK 168

  6. Rrobot V3 If there is a blockade, then walk around; otherwise move along. ITK 168

  7. Branching Condition Statement list 1 T Condition Statement list T F F Statement list 2 ITK 168

  8. The Syntax of if and if-else statements A Boolean expression (logical expression). In Java, there are two possible values: true and false. if ( condition ) { statement list; } Reserved words A reserved word can’t be used as an identifier if ( condition ) { statement list1; } else { statement list2; } Indentation indicates that the statements in the statement list are at the level next to the if-else statement. ITK 168

  9. if – else statement if (Condition) { } else { } // The rest of the // program Statement list 1 Condition Statement list 1 T Could have another if F Statement list 2 Statement list 2 The rest of the program ITK 168

  10. More services provided by Robots ITK 168

  11. import becker.robots.*; publicclass RobotV3 extends RobotV2 { public RobotV3(City theCity, int aStreet, int anAvenue, Direction aDirection) { super(theCity, aStreet, anAvenue, aDirection); } publicvoid moveEast() { if (this.frontIsClear()) { this.move(); } else { this.walkAroundToEast(); } } publicvoid moveWest() { if (this.frontIsClear()) { this.move(); } else { this.walkAroundToWest(); } } If there is a blockade, then walk around; otherwise move along. ITK 168

  12. import .... publicclass UsingRobotV3 { publicstaticvoid main(String[] args) { .... RobotV3 mark = new RobotV3(ny, 1, 0, Direction.EAST); mark.moveEast(); mark.moveEast(); mark.moveEast(); mark.moveEast(); mark.moveEast(); mark.moveEast(); mark.pickThing(); mark.turnAround(); mark.moveWest(); mark.moveWest(); mark.moveWest(); mark.moveWest(); mark.moveWest(); mark.moveWest(); } } 0 1 2 3 4 5 6 7 ITK 168

  13. Measure the kid’s height, h Disney Roller Coaster Ride h < 4 No Yes Ride the roller coaster Boy or Girl? boy girl Give a Mickey Give a Mini Next Stop ITK 168

  14. h = Integer.parseInt( JOptionPane.showInputDialog(“How tall is the kid?”)); // IsBoy = true or false; if (h < 4) { if (IsBoy)// Same asif (IsBoy == true) { System.out.println(“Take a Mickey”); } else { System.out.println(“Take a Mini.”); } } // end true part of if (h < 4) else // else part of if (h < 4) { System.out.println(“You can ride!!”); } // end else part of if (h < 4) System.out.println(“Go to the next stop.”); Disney Ride in Java ITK 168

  15. import .... publicclass UsingRobotV3 { publicstaticvoid main(String[] args) { .... RobotV3 mark = new RobotV3(ny, 1, 0, Direction.EAST); mark.moveEast(); mark.moveEast(); mark.moveEast(); mark.moveEast(); mark.moveEast(); mark.moveEast(); mark.pickThing(); mark.turnAround(); .... } } They are repeated operations 0 1 2 3 4 5 6 7 This is still to specific!! ITK 168

  16. Loops Condition Statement list T F ITK 168

  17. while when there is nothing to pick Condition while (Condition) { Statement list } Statement list T F move to next pos. ITK 168

  18. import .... publicclass UsingRobotV3 { publicstaticvoid main(String[] args) { .... RobotV3 mark = new RobotV3(ny, 1, 0, Direction.EAST); while (!mark.canPickThing()) { mark.moveEast(); } mark.pickThing(); mark.turnAround(); .... } } 0 1 2 3 4 5 6 7 ITK 168

  19. Definite Loop • In programming a definite loop is more welcome. • I.e., number of iterationsisknown before the loop begins, at least the upper bound is known. • I.e., repeat the loop 100 times. • Precisely speaking, there is no definite loop in Java • We will talk about it in Chapter 5 ITK 168

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