OO in java DEMO

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最新推荐文章于 2025-02-25 17:06:56 发布

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本文介绍了一个使用Java语言实现的简单猜数字游戏，包括游戏逻辑、玩家交互和得分判断。

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// quote from "Head First Java, 2e"
public class GameLauncher {
    public static void main(String[] args) {
        GuessGame game = new GuessGame();
        game.startGame();
    }
}

public class GuessGame {
    // instance variable
    // these are "object references"
    // variable in java can only hold 'primitive types' 
    // & 'object reference'
    Player p1;
    Player p2;
    Player p3;
    
    public void startGame() {
        p1 = new Player();
        p2 = new Player();
        p3 = new Player();
        
        int guessp1 = 0;
        int guessp2 = 0;
        int guessp3 = 0;
        
        boolean p1isRight = false;
        boolean p2isRight = false;
        boolean p3isRight = false;
        
        int targetNumber = (int) (Math.random() * 10);
        System.out.println("I'm thinking of a number between 0 and 9...");
        
        while (true) {
            System.out.println("Number to guess is " + targetNumber);
            
            p1.guess();
            p2.guess();
            p3.guess();
            
            guessp1 = p1.number;
            System.out.println("Player one guessed " + guessp1);
            
            guessp2 = p2.number;
            System.out.println("Player two guessed " + guessp2);
            
            guessp3 = p3.number;
            System.out.println("Player three guessed " + guessp3);
            
            if (guessp1 == targetNumber) {
                p1isRight = true;
            }
            if (guessp2 == targetNumber) {
                p2isRight = true;
            }
            if (guessp3 == targetNumber) {
                p3isRight = true;
            }
            
            if (p1isRight || p2isRight || p3isRight) {
                System.out.println("We have a winner!");
                System.out.println("Player one got it right? " + p1isRight);
                System.out.println("Player two got it right?" + p2isRight);
                System.out.println("Player three got it right?" + p3isRight);
                System.out.println("Game is over.");
                break; // game over, so break out of the loop
            } else {
                // we must keep going because nobody got it right!
                System.out.println("Player will have to try again.");
            } // end if/else
        }
    }
}

public class Player {
    int number = 0; // where the guess goes
    
    public void guess() {
        number = (int) (Math.random() * 10);
        System.out.println("I'm guessing " + number);
    }
}

I'm thinking of a number between 0 and 9...
Number to guess is 3
I'm guessing 3
I'm guessing 4
I'm guessing 8
Player one guessed 3
Player two guessed 4
Player three guessed 8
We have a winner!
Player one got it right? true
Player two got it right?false
Player three got it right?false
Game is over.