java - 如何从ArrayList中选择一个特定的对象

Question

我们正在制作一个简单的角色扮演游戏。现在我们有一个叫做战场的类，玩家可以在其中与怪物战斗。当我们开始战斗时，我们使用随机生成器来随机挑选一个怪物。在终端/主方法中，我们有“攻击”和“运行”等命令，这些命令要么对随机怪物造成伤害，要么让玩家离开/退出游戏。现在，我们正在尝试添加一个名为“attackiest”的命令，这将使玩家能够对抗最难、伤害最大的怪物(我们的主菜单中有三个可供选择)。我们需要一种方法来根据伤害从 ArrayList 怪物中选择特定对象。有人对我们如何做到这一点有建议吗？

这是我们在 Battleground 类中启动游戏的代码:

 public void startBattle() {
    printWelcomeMessage();
    boolean finished = false;


    this.currentMonster = getRandomMonster();


    if(this.currentMonster == null) {
        return;
    }

    System.out.println("A random monster is chosen for you. Prepare to meet the mighty " + this.currentMonster.getName());
    System.out.println("\n-------- Player Stats ---------");
    System.out.println(this.player);
    while(!finished && monsters.size() > 0) {
        ArrayList<String> commands = reader.getInput();

        if(isValidCommand(commands)) {

            if(commands.contains("quit") && !this.currentMonster.isDead()){
                System.out.println("You can't quit the game in the middle of a fight!");
            }else if(commands.contains("quit") && this.currentMonster.isDead()) {
                finished = true;
                System.out.println();
                printFinalStats();
                System.out.println();
                System.out.println("You have left the arena, and the game has ended.");
                System.out.println();
            }


            if(commands.contains("run")) {
                finished = true;
                System.out.println("You are a coward and you lose 50 gold pieces...\n");
                this.player.changeGold(-50);
                printFinalStats();
                System.out.println("\nThanks for playing...");

            }else if(commands.contains("drink") && !this.currentMonster.isDead()){
                Potion potion = (Potion) player.findItem(commands.get(1));
                player.drinkPotion(potion);

            }else if(commands.contains("equip") && !this.currentMonster.isDead()){
            Weapons weapon = (Weapons) player.findItem(commands.get(1));
            player.useWeapon(weapon);
            } else if(commands.contains("attack") && !this.currentMonster.isDead()) {

                if(this.player.attack(this.currentMonster)) {
                        playerWon();
                    if(this.monsters.size() > 0) {
                        System.out.println("\nThere are " + this.monsters.size() + " more monsters to beat\nType \"attack\" if you want to attack another monster, or \"quit\" if you want to end the game.");                 
                    } else {
                        System.out.println("\n\n#### Congratulations ####\nYou have beaten every single monster in the game. You are a true champion!");
                        printFinalStats();
                        finished = true;
                    }

                } else if(this.currentMonster.attack(this.player)) {
                    printLosingMessage();
                    finished = true;
                }

            } else if(commands.contains("attack") && this.currentMonster.isDead() && this.monsters.size() > 0) {
                this.currentMonster = getRandomMonster();
                printContinueMessage(this.player, this.currentMonster);
                this.player.changeHealth(50);
            }

        } else {
            System.out.println("Please write a valid command. Valid commands are:");
            printCommands();
        }
    }
}

这是主类中怪物的ArrayList:

 Monster beelzebub = new Monster("Beelzebub", 60);
    Monster witch = new Monster("Witch", 40);
    Monster ogre = new Monster("Ogre", 80);

 ArrayList<Monster> monsters = new ArrayList<>();

    monsters.add(beelzebub);
    monsters.add(witch);
    monsters.add(ogre);

  Battleground battleground = new Battleground(monsters, player, reader);
    battleground.startBattle();

我们感谢任何帮助!

Answer 1

用 SortedSet 或 PriorityQueue 替换 ArrayList。为 Monster 类实现一个比较器。然后只需选择怪物集合的第一个元素即可。