Question

Create the ArrayList program example in listing 13.1, Battlepoint. Describe the code (in your WORD document)...

Create the ArrayList program example in listing 13.1, Battlepoint.

  1. Describe the code (in your WORD document) in the 'if' statement
    • if (targets.indexOf(shot) > -1) {
  2. ADD a NEW ArrayList of points called 'misses'
  3. ADD code to add a point to the 'misses' list on a miss (if a SHOT does NOT hit a TARGET)
  4. ADD code to place an 'M' in the final output map for all shots that were MISSES.
  5. ADD code to place an H on the target for any shots that HIT a target.
  6. SUBMIT your new Battlepoint code (no input arguments).

package com.java24hours;

import java.awt.*;
import java.util.*;
public class Battlepoint {
ArrayList<Point> targets = new ArrayList<Point>();
public Battlepoint() {
// create targets to shoot at
createTargets();
// display the game map
showMap();
// shoot at three points
shoot(7,4);
shoot(3,3);
shoot(9,2);
// display the map again
showMap();
}

private void showMap() {
System.out.println("\n 1 2 3 4 5 6 7 8 9");
for (int column = 1; column < 10; column++) {
for (int row = 1; row < 10; row++) {
if (row == 1) {
System.out.print(column + " ");
}
System.out.print(" ");
Point cell = new Point(row, column);
if (targets.indexOf(cell) > -1) {
// a target is at this position
System.out.print("X");
} else {
// no target is here
System.out.print(".");
}
System.out.print(" ");
}
System.out.println();
}
System.out.println();
}

private void createTargets() {
Point p1 = new Point(5,9);
targets.add(p1);
Point p2 = new Point(4,5);
targets.add(p2);
Point p3 = new Point(9,2);
targets.add(p3);
}

private void shoot(int x, int y) {
Point shot = new Point(x,y);
System.out.print("Firing at (" + x + "," + y + ") ... ");
if (targets.indexOf(shot) > -1) {
System.out.println("you sank my battlepoint!");
// delete the destroyed target
targets.remove(shot);
} else {
System.out.println("miss.");
}
}

public static void main(String[] arguments) {
new Battlepoint();
}
}

Homework Answers

Answer #1

/************* BattlePoint.java ***************/

import java.awt.Point;
import java.util.ArrayList;

public class BattlePoint {
   ArrayList<Point> targets = new ArrayList<>();
   ArrayList<Point> misses = new ArrayList<>();
   Point hit = null;
   boolean after = false;

   public BattlePoint() {
       createTargets();
       showMap();
       shoot(7, 4);
       shoot(3, 3);
       shoot(9, 2);
       after = true;
       showMap();
   }

   private void showMap() {
       System.out.println("\n 1 2 3 4 5 6 7 8 9");
       for (int column = 1; column < 10; column++) {
           for (int row = 1; row < 10; row++) {
               if (row == 1) {
                   System.out.print(column + " ");
               }
               System.out.print(" ");
               Point cell = new Point(row, column);
               if (targets.indexOf(cell) > -1) {
                   System.out.print(String.format("%s", after ? "M" : "X"));
               } else if (after && hit != null && hit.x == row && hit.y == column) {
                   System.out.print("H");
               } else {
                   System.out.print(".");
               }
               System.out.print(" ");
           }
           System.out.println();
       }
       System.out.println();
   }

   private void createTargets() {
       Point p1 = new Point(5, 9);
       targets.add(p1);
       Point p2 = new Point(4, 5);
       targets.add(p2);
       Point p3 = new Point(9, 2);
       targets.add(p3);
   }

   private void shoot(int x, int y) {
       Point shot = new Point(x, y);
       System.out.print("Firing at (" + x + "," + y + ") ... ");
       if (targets.indexOf(shot) > -1) {
           System.out.println("you sank my battlepoint!");
           targets.remove(shot);
           hit = shot;
       } else {
           misses.add(shot);
           System.out.println("miss.");
       }
   }

   public static void main(String[] arguments) {
       new BattlePoint();
   }
}

/********** Output ***********/

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