Head First java——战舰游戏代码

代码示例：
主类

package dot.com;import java.util.*;public class DotComBust {private GameHelper helper=new GameHelper();private ArrayList<DotCom> dotComsList=new ArrayList<DotCom>();private int numOfGuesses=0;private void setUpGame() {DotCom one=new DotCom();one.setName("Pets.com");DotCom two=new DotCom();two.setName("eToys.com");DotCom three=new DotCom();three.setName("Go2.com");dotComsList.add(one);dotComsList.add(two);dotComsList.add(three);System.out.println("Your goal is to sink three dot coms.");System.out.println("Pets.com,eToys.com,Go2.com");System.out.println("Try to sink them all in the fewest number of guesses");for(DotCom dotComToSet:dotComsList) {//对list中所有的DitCom重复ArrayList<String> newLocation=helper.placeDotCom(3);//要求DotCom的位置dotComToSet.setLocationCells(newLocation);//调用这个DotCom的setter方法来指派刚取得的位置}}private void startPlaying() {while(!dotComsList.isEmpty()) {String userGuess=helper.getUserInput("Enter a guess");//取得玩家输入checkUserGuess(userGuess);}finishGame();}private void checkUserGuess(String userGuess) {numOfGuesses++;String result="miss";for(DotCom dotComToTest:dotComsList) {result=dotComToTest.checkYourself(userGuess);if(result.equals("hit")) {break;}if(result.equals("kill")) {dotComsList.remove(dotComToTest);break;}}System.out.println(result);}private void finishGame() {System.out.println("All Dot Coms are dead! Your stock is now worthless.");if(numOfGuesses<=18) {System.out.println("It only took you"+numOfGuesses+"guesses.");System.out.println("You got out before your options sank.");}else {System.out.println("Took you long enough."+numOfGuesses+"guesses.");System.out.println("Fish are dancing with your options.");}}public static void main(String[] args) {DotComBust game=new DotComBust();game.setUpGame();game.startPlaying();}
}

代码：GameHelper类

package dot.com;import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;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));//java.io里面的类：BufferedReader(readLine是其里面的方法)和InputStreamReaderinputLine=is.readLine();if(inputLine.length()==0)return null;}catch (IOException e) {System.out.println("IOException:"+e);}return inputLine.toLowerCase();//变成小写字母}public ArrayList<String> placeDotCom(int comSize){ArrayList<String> alphaCells=new ArrayList<String>();@SuppressWarnings("unused")String [] alphacoords=new String[comSize];String temp=null;int [] coords =new int [comSize];int attempts=0;boolean success=false;int location=0;comCount++;int incr=1;if((comCount%2)==1) {incr=gridLength;}while(!success&attempts++<200) {location =(int)(Math.random()*gridSize);//随机起点int x=0;success=true;while(success&&x<comSize) {if(grid[location]==0) {coords[x++]=location;location+=incr;if(location>=gridSize) {success=false;}if(x>0&&(location%gridLength==0)) {//超出右边缘，失败success=false;}}else {//找到已经使用的位置，失败success=false;}}}//while结束int x=0;int row=0;int column=0;while (x<comSize) {grid[coords[x]]=1;row=(int)(coords[x]/gridLength);//得到行的值column=coords[x]%gridLength;//得到列的值temp=String.valueOf(alphabet.charAt(column));//转换成字符串alphaCells.add(temp.concat(Integer.toString(row)));x++;}return alphaCells;}
}

代码：DotCom类

package dot.com;import java.util.ArrayList;public class DotCom {private ArrayList<String> locationCells;private String name;public void setLocationCells(ArrayList<String> loc) {locationCells=loc;}public void setName(String n) {name=n;}public String checkYourself(String userInput) {String result="miss";int index=locationCells.indexOf(userInput);//如果玩家猜中，会返回位置信息if(index>=0) {locationCells.remove(index);if(locationCells.isEmpty()) {result="kill";System.out.println("Ouch! You sunk"+name+" :(");}else {result="hit";}}return result;}
}

运行结果：

Your goal is to sink three dot coms.
Pets.com,eToys.com,Go2.com
Try to sink them all in the fewest number of guesses
Enter a guess a3
miss
//略掉。。。。。
Enter a guess c7
miss
Enter a guess d6
hit
Enter a guess e6
Ouch! You sunkeToys.com :(
kill
Enter a guess d1
miss
Enter a guess d2
hit
Enter a guess d3
hit
Enter a guess d4
Ouch! You sunkPets.com :(
kill
Enter a guess d5
miss
//略掉。。。。。
Enter a guess g1
miss
Enter a guess g2
hit
Enter a guess g3
hit
Enter a guess g5
miss
Enter a guess g4
Ouch! You sunkGo2.com :(
kill
All Dot Coms are dead! Your stock is now worthless.
Took you long enough.52guesses.
Fish are dancing with your options.

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