Head first java 第五章（二）

DotCom类

import java.util.ArrayList;public class DotCom {    private ArrayList<String> locationCells;    private String name;    public void setLocationCells(ArrayList<String> loc){        locationCells = loc;                     //方法    }    public void setName(String n){        name = n;                               //方法    }    public String checkYourself(String userInput){        String result = "miss";        int index = locationCells.indexOf(userInput);        if(index >= 0){                    //if猜中            locationCells.remove(index);                     if(locationCells.isEmpty()){                result = "kill";           //若locationCells为空，则该DotCom被kill                System.out.println(name+" go die");            }else{                result = "hit";             //若不为空，则result为hit            }        }        return result;     //checkYourself方法返回result    }}

DotComBust类

import java.util.ArrayList;public class DotComBust {    private GameHelper helper = new GameHelper();    private ArrayList<DotCom> dotComList = new ArrayList<DotCom>();    private int numOfGuesses = 0;    private void setUpGame(){        DotCom one = new DotCom();        one.setName("dog.com");        DotCom two = new DotCom();        two.setName("ac.com");        DotCom three = new DotCom();        three.setName("bili.com");        dotComList.add(one);        dotComList.add(two);        dotComList.add(three);   //初始化，命名及加入ArrayList        System.out.println("kaishi");        for(DotCom dotComToSet : dotComList){            ArrayList<String> newLocation = helper.placeDotCom(3);            dotComToSet.setLocationCells(newLocation);        }    }    private void startPlaying(){        while(!dotComList.isEmpty()){            String userGuess = helper.getUserInput("enter a guess");            checkUserGuess(userGuess);           //调用checkUserGuess方法检查输入        }        finishGame();    }    private void checkUserGuess(String userGuess){        numOfGuesses++;        String result = "miss";        for(DotCom dotComToTest :dotComList){            result = dotComToTest.checkYourself(userGuess);           //调用checkYourself方法            if (result.equals("hit")){                break;                      //checkYourself方法返回result为hit，则输出结果            }            if(result.equals("kill")){                dotComList.remove(dotComToTest);                break;                    //checkYourself方法返回result为kill，从DotComList移除DotComToTest            }        }        System.out.println(result);    }    private void finishGame(){        System.out.println("你赢了");        if(numOfGuesses <= 18){            System.out.println("一共"+numOfGuesses+"次完成游戏");        }else{            System.out.println("用时有点久");        }    }    public static void main (String[] args){        DotComBust game = new DotComBust();        game.setUpGame();        game.startPlaying();    }}

GameHelper类（该类主要用处为设置DotCom位置）

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.util.ArrayList;public class GameHelper {      private static final String alphabet = "abcdefg";      private int gridLength = 7;      private int gridSize = 49;      private int [] grid = new int[gridSize];      private int comCount = 0;      public String getUserInput(String prompt) {         String inputLine = null;         System.out.print(prompt + "  ");         try {           BufferedReader is = new BufferedReader(         new InputStreamReader(System.in));           inputLine = is.readLine();           if (inputLine.length() == 0 )  return null;          } catch (IOException e) {           System.out.println("IOException: " + e);         }         return inputLine.toLowerCase();      }     public ArrayList<String> placeDotCom(int comSize) {                 // line 19        ArrayList<String> alphaCells = new ArrayList<String>();        String [] alphacoords = new String [comSize];      // holds 'f6' type coords        String temp = null;                                // temporary String for concat        int [] coords = new int[comSize];                  // current candidate coords        int attempts = 0;                                  // current attempts counter        boolean success = false;                           // flag = found a good location ?        int location = 0;                                  // current starting location        comCount++;                                        // nth dot com to place        int incr = 1;                                      // set horizontal increment        if ((comCount % 2) == 1) {                         // if odd dot com  (place vertically)          incr = gridLength;                               // set vertical increment        }        while ( !success & attempts++ < 200 ) {             // main search loop  (32)        location = (int) (Math.random() * gridSize);      // get random starting point            //System.out.print(" try " + location);        int x = 0;                                        // nth position in dotcom to place            success = true;                                 // assume success            while (success && x < comSize) {                // look for adjacent unused spots              if (grid[location] == 0) {                    // if not already used                 coords[x++] = location;                    // save location                 location += incr;                          // try 'next' adjacent                 if (location >= gridSize){                 // out of bounds - 'bottom'                   success = false;                         // failure                 }                 if (x>0 & (location % gridLength == 0)) {  // out of bounds - right edge                   success = false;                         // failure                 }              } else {                                      // found already used location                  // System.out.print(" used " + location);                    success = false;                          // failure              }            }        }                                                   // end while        int x = 0;                                          // turn good location into alpha coords        int row = 0;        int column = 0;        // System.out.println("\n");        while (x < comSize) {          grid[coords[x]] = 1;                              // mark master grid pts. as 'used'          row = (int) (coords[x] / gridLength);             // get row value          column = coords[x] % gridLength;                  // get numeric column value          temp = String.valueOf(alphabet.charAt(column));   // convert to alpha          alphaCells.add(temp.concat(Integer.toString(row)));          x++;          // System.out.print("  coord "+x+" = " + alphaCells.get(x-1));        }        // System.out.println("\n");        return alphaCells;       }    }