Head First JAVA学习笔记

Battle-style Game

Version.1

三个类：

1. 工具类 GameHelper()
2. DotCom类 SimpleDotCom()
3. Game类 SimpleDotComGame()

GameHelper():

package BattleGame;
import java.io.*;

public class GameHelper {
	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;
	}
}

SimpleDotCom()

package BattleGame;

public class SimpleDotCom {
	int[] locationCells;
	int numOfHits = 0;
	
	public void setLocationCells(int[] locs) {
		locationCells = locs;
	}
	
	public String checkYourself(String stringGuess) {
		int guess = Integer.parseInt(stringGuess);
		String result = "miss";
		
		for(int cell : locationCells) {
			if(guess == cell) {
				result = "hit";
				
				numOfHits++;
				break;
			}
		}
		if(numOfHits == locationCells.length) {
			result = "kill";
		} 
		System.out.println("result: "+result);
		return result;
	}
	
}

SimpleDotComGame()

package BattleGame;

public class SimpleDotComGame {
	public static void main(String[] args) {
		int numOfGuess = 0;
		GameHelper helper = new GameHelper();
		
		SimpleDotCom dc = new SimpleDotCom();
		int randomNum = (int)(Math.random()*5);
		int[] locations = {randomNum, randomNum+1, randomNum+2};
		dc.setLocationCells(locations);
		
		boolean isAlive = true;
		while(isAlive) {
			String guess = helper.getUserInput("enter a number");
			String returnResult = dc.checkYourself(guess);
			numOfGuess++;
			if (returnResult == "kill") {
				isAlive = false;
				System.out.println("You took "+numOfGuess+" guesses");
			}
			
		}
	}
}