Summary
Complete RobotRat.java Source Code Listing
Example 3.14: RobotRat.java (Complete Listing)
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1 /* ******************************************************************* 2 Class: IST 149 3 Project: Robot Rat 4 Student: Rick Miller 5 ******************************************************************* */ 6 7 import java.io.*; 8 9 /** 10 * @author <b> Rick Miller </b> 11 * @version 1.0 12 * 13 */ 14 public class RobotRat { 15 // private instance attributes 16 17 private BufferedReader console = null; 18 private int pen_position = 0; 19 private int direction = 0; 20 private boolean floor[][] = null; 21 private int current_row = 0; 22 private int current_col = 0; 23 24 // class constants 25 26 private static final int NORTH = 0; 27 private static final int SOUTH = 1; 28 private static final int EAST = 2; 29 private static final int WEST = 3; 30 private static final int UP = 0; 31 private static final int DOWN = 1; 32 33 /** 34 * RobotRat constructor 35 * @param rows The number of rows to create in the floor array 36 * @param cols The number of columns to create in the floor array 37 */ 38 public RobotRat(int rows, int cols){ 39 //Initialize RobotRat attributes 40 console = new BufferedReader(new InputStreamReader(System.in)); 41 direction = EAST; 42 pen_position = UP; 43 current_row = 0; 44 current_col = 0; 45 floor = new boolean[rows][cols]; 46 initializeFloor(); 47 } 48 49 /** 50 * Initializes each floor array element to false 51 */ 52 private void initializeFloor(){ 53 for(int i = 0; i<floor.length; i++){ 54 for(int j = 0; j<floor[i].length; j++){ 55 floor[i][j] = false; 56 } 57 } 58 } 59 60 /** 61 * Repeatedly displays the RobotRat control menu and 62 * processes user commands. 63 */ 64 public void run(){ 65 while(true){ 66 printMenu(); 67 processMenuChoice(); 68 } 69 } 70 71 /** 72 * Prints the RobotRat control menu to the console 73 */ 74 private void printMenu(){ 75 System.out.println("\n\n"); 76 System.out.println(" Robot Rat Control Menu"); 77 System.out.println("\n"); 78 System.out.println(" 1. Pen Up"); 79 System.out.println(" 2. Pen Down"); 80 System.out.println(" 3. Turn Right"); 81 System.out.println(" 4. Turn Left"); 82 System.out.println(" 5. Move Forward"); 83 System.out.println(" 6. Print Floor"); 84 System.out.println(" 7. Exit"); 85 System.out.println("\n\n\n"); 86 } 87 88 /** 89 * Gets number of spaces to move the RobotRat 90 * @return An integer value represeting spaces to move 91 */ 92 private int getSpaces(){ 93 int temp = 0; 94 try{ 95 temp = Integer.parseInt(console.readLine()); 96 }catch(Exception e){ 97 System.out.println("Spaces has been set to zero!"); 98 } 99 return temp; 100 } 101 102 /** 103 * Reads text string user input and returns the first character 104 * @return First character of user text string input 105 */ 106 private char readChar(){ 107 String s = null; 108 System.out.print("Please select from the menu: "); 109 try{ 110 s = console.readLine(); 111 }catch(Exception ignored){} 112 return s.charAt(0); 113 } 114 115 /** 116 * Menu processing method. 117 * @see #readChar() 118 */ 119 private void processMenuChoice(){ 120 121 switch(readChar()){ 122 case '1': setPenUp(); 123 break; 124 case '2': setPenDown(); 125 break; 126 case '3': turnRight(); 127 break; 128 case '4': turnLeft(); 129 break; 130 case '5': move(); 131 break; 132 case '6': printFloor(); 133 break; 134 case '7': exit(); 135 default: printErrorMessage(); 136 } 137 } 138 139 /** 140 * Sets the RobotRat's pen to the UP position 141 */ 142 private void setPenUp(){ 143 pen_position = UP; 144 System.out.println("The pen_position is UP"); 145 } 146 147 /** 148 * Sets the RobotRat's pen to the DOWN position 149 */ 150 private void setPenDown(){ 151 pen_position = DOWN; 152 System.out.println("pen_position is DOWN"); 153 } 154 155 156 /** 157 * Turns the RobotRat to the right 158 */ 159 private void turnRight(){ 160 switch(direction){ 161 case NORTH: direction = EAST; 162 System.out.println("RobotRat facing EAST"); 163 break; 164 case EAST: direction = SOUTH; 165 System.out.println("RobotRat facing SOUTH"); 166 break; 167 case SOUTH: direction = WEST; 168 System.out.println("RobotRat facing WEST"); 169 break; 170 case WEST: direction = NORTH; 171 System.out.println("RobotRat facing NORTH"); 172 break; 173 default: direction = EAST; 174 System.out.println("RobotRat facing EAST"); 175 } 176 System.out.println("turnRight() method"); 177 } 178 179 /** 180 * Turns the RobotRat to the left 181 */ 182 private void turnLeft(){ 183 switch(direction){ 184 case NORTH: direction = WEST; 185 System.out.println("RobotRat facing WEST"); 186 break; 187 case EAST: direction = NORTH; 188 System.out.println("RobotRat facing NORTH"); 189 break; 190 case SOUTH: direction = EAST; 191 System.out.println("RobotRat facing EAST"); 192 break; 193 case WEST: direction = SOUTH; 194 System.out.println("RobotRat facing SOUTH"); 195 break; 196 default: direction = EAST; 197 System.out.println("RobotRat facing EAST"); 198 } 199 } 200 201 /** 202 * This method moves the RobotRat about the floor. 203 * @see #getSpaces() 204 */ 205 private void move(){ 206 System.out.print("Please enter spaces to move: "); 207 int spaces = getSpaces(); 208 switch(pen_position){ 209 case UP: switch(direction){ 210 case NORTH: if((current_row - spaces) <= 0) 211 current_row = 0; 212 else current_row = current_row - spaces; 213 break; 214 case SOUTH: if((current_row + spaces) >= (floor[0].length -1)) 215 current_row = (floor[0].length -1); 216 else current_row = current_row + spaces; 217 break; 218 case EAST: if((current_col + spaces) >= (floor.length -1)) 219 current_col = (floor.length -1); 220 else current_col = current_col + spaces; 221 break; 222 case WEST: if((current_col - spaces) <= 0) 223 current_col = 0; 224 else current_col = current_col - spaces; 225 break; 226 } 227 break; 228 case DOWN: switch(direction){ 229 case NORTH: if((current_row - spaces) <= 0){ 230 while(current_row >= 1) 231 floor[current_row--][current_col] = true; 232 } 233 else while(spaces-- > 0) 234 floor[current_row--][current_col] = true; 235 break; 236 case SOUTH: if((current_row + spaces) >= (floor[0].length -1)){ 237 while(current_row < (floor[0].length-1)) 238 floor[current_row++][current_col] = true; 239 } 240 else while(spaces-- > 0) 241 floor[current_row++][current_col] = true; 242 break; 243 case EAST: if((current_col + spaces) >= (floor.length -1)){ 244 while(current_col < (floor.length-1)) 245 floor[current_row][current_col++] = true; 246 } 247 else while(spaces-- > 0) 248 floor[current_row][current_col++] = true; 249 break; 250 case WEST: if((current_col - spaces) <= 0){ 251 while(current_col >= 1) 252 floor[current_row][current_col--] = true; 253 } 254 else while(spaces-- > 0) 255 floor[current_row][current_col--] = true; 256 break; 257 } 258 break; 259 } 260 } 261 262 /** 263 * Prints the floor array pattern to the console 264 * @see #floor 265 */ 266 private void printFloor(){ 267 for(int i = 0; i<floor.length; i++){ 268 for(int j=0; j<floor[i].length; j++){ 269 if(floor[i][j] == true) 270 System.out.print('*'); 271 else System.out.print('0'); 272 } 273 System.out.println(); 274 } 275 } 276 277 /** 278 * Exits the RobotRat program 279 * @see System#exit 280 */ 281 private void exit(){ 282 System.exit(0); 283 } 284 285 286 /** 287 * Prints error text message when invalid RobotRat menu item entered 288 */ 289 private void printErrorMessage(){ 290 System.out.println("Please enter a valid menu choice!"); 291 } 292 293 294 /** 295 * The main method. This makes RobotRat an application. 296 */ 297 public static void main(String[] args){ 298 RobotRat rr = new RobotRat(20, 20); 299 rr.run(); 300 } 301 }//end RobotRat class definition |
Java For Artists: The Art, Philosophy, And Science Of Object-Oriented Programming
ISBN: 1932504052
EAN: 2147483647
EAN: 2147483647
Year: 2007
Pages: 452
Pages: 452
Authors: Kasparian Raffi