3.22 学习进度

技术学习

JAVA

(上午)

• HF Java 对于第五章实战那个游戏，进行了一定的改进，增加了一行

自己的简版战舰改进（DeBug）

if(guess>=1 && guess<=9)
和
if(guess>=10 && guess <=0){
                result = "Out of Range input again";
            }
//检测用户输入的值是否存在于战场域中，如果输入越界则将提醒用户输入越界
//用户输入不越界才进行检测
//并定义了一个实例变量check，当第一次击中时候，check=guess以保护这个方块
//再次击中则不算入击中数中
if(guess>=1 && guess<=9){
            for (int cell : locationCells){
                if (guess == cell){                          
                //增加一个check变量防止多次击中同一个部位造成Kill
                    if(check==guess){
                        result= "You have already hit it ";
                }
                    if(check != guess){
                    result = "hit";
                    check = guess;
                    num_Hits ++;
                }       
                break;}
            }// break for loops
        }

(晚上)

• 发现书中解决bugs的方式是调用ArrayList.........
• 只能说66666
• 果然书中的东西就是高大上

书上的简版战舰DeBug

//战舰游戏简版游戏类
// 优化版的游戏战舰设计类
import java.util.ArrayList;
/*
 ArrayList 一些方法
 @ add(Object)         向List中加入对象参数
 @ remove（int）       在索引参数中删除对应的对象
 @remove（Object）     移除该对象
 @contains（Object）   如果和对象参数匹配返回“true”
 @isEmpty（）          如果list中没有元素返回true
 @index（Object）      返回对象参数的索引或-1
 @size                 返回list元素中的一个数
 @get（int）           返回当前索引参数的对象  
 */
public class Dotc {
    private ArrayList<String> locationCells;
    public void setLocationCells(ArrayList<String> loc){
        locationCells = loc;
    }
    public String checkYourself (String stringGuess){
        String result = "miss";
     int index = locationCells.indexOf(userInput);
     if(index >= 0){
         locationCells.remove(index);
         if(locationCells.isEmpty()) {
             result = "kill";
         }else{
             result = " hit";
         }
         }
    return result ; 
    }
}

• 于是学着做了一个战舰游戏豪华版出来，战场从一维9个变成了7x7,49个,战舰的长度也从2变成了3

豪华版战舰游戏——战舰类

//战舰类，创造三个战舰并为他们命名
package Test; //好像不加这个就过不编译 但是不懂原理
import java.util.ArrayList;
public class DotCom {
    private ArrayList<String> locationCells;
    public void setLocationCells(ArrayList<String> loc)
    {
        locationCells = loc;
    }
    public String checkYourself(String userInput)
    {
        String result = "miss";
        int index = locationCells.indexOf(userInput);
        if (index >= 0) {
            locationCells.remove(index);
            if (locationCells.isEmpty()) {
                result = "kill";
            }
            else
            {
                result = "hit";
            }
        }
        return result;
    }
    //TODO:  all the following code was added and should have been included in the book
    private String name;
    public void setName(String string) {
        name = string;
    }
}

豪华版战舰游戏——游戏主类

//游戏主类，定义了创造游戏（创造对象并放入ArrayList），开始游戏（检查战舰是否存活，输入和检查），检查输入，和结束游戏4个方法  并且是作为main方法入口
package Test;
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 dotComSet : dotComsList) {
            ArrayList<String> newLocation = helper.placeDotCom(3);
            dotComSet.setLocationCells(newLocation);
        }
    }
    private void startPlaying() {
        while (!dotComsList.isEmpty()) {
            String userGuess = helper.getUserInput("Enter a guess");
            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();
    }
}

豪华版战舰游戏——游戏辅助类

//GameHelper类 处理输入，设置战舰位置
//搬的砖头，有些不太理解，日后回头再改
package Test;
import java.io.*;
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));
       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)); //将注释去掉就可以获得三个战舰的位置
    }
     //System.out.println("\n");//获得三个战舰位置前取消去掉注释可以使格式更好看
    return alphaCells;
   }
}

• HF JAVA 第六章学习

Android

(上午)

• 一早上都在找合适的API接口
• 跳转bug成功修复

(晚上)

• 兴致勃勃照着砖头测试api，果不其然挂了
• api啊api，继续翻砖头测试api
• 发现电脑性能瓶颈，同时运行两个AS RAM 挂掉..郁闷