Setter 和 Getter 到不同的类

Question

我的问题是，我根本不知道使用什么代码将我的值从我的 getX 方法获取到我的其他类主方法。

package hangman;

公共类刽子手{

private int triesLimit;
private String word;

public void setTriesLimit(int triesLimit) {
    this.triesLimit = triesLimit;
}

public void setWord(String word) {
    this.word = word;
}

public int getTriesLimit() {
    return this.triesLimit;
}

public String getWord() {
    return this.word;
}


@Override
public String toString() {
    return ("Enter Secret Word " + this.getWord()
            + ".\nEnter max # of tries (Must be under 7) "
            + this.getTriesLimit());
}

}

这是来自子类的内容，我正在尝试将riesLimit 的值存储到此类主方法的主方法中 包刽子手；

public class PlayHangman {

public static void main(String[] args) {
    Hangman hangman = new Hangman();
    Scanner scn = new Scanner(System.in);
    int triesCount = 0;
    int correctCount = 0;
    hangman.toString();
    int triesLimit = hangman.getTriesLimit();
    String secretWord = hangman.getWord();
    StringBuilder b = new StringBuilder(secretWord.length());
    for (int i = 0; i < secretWord.length(); i++) {
        b.append("*");
    }
    char[] secrectStrCharArr = secretWord.toCharArray();
    int charCnt = secretWord.length();
    for (int x = 0; triesCount < triesLimit; triesCount++) {
        while (charCnt >= 0) {
            System.out.println("Secrect Word :" + b.toString());
            System.out.println("Guess a letter :");

            char guessChar = scn.next().toCharArray()[0];
            for (int i = 0; i < secrectStrCharArr.length; i++) {
                if (guessChar == secrectStrCharArr[i]) {
                    b.setCharAt(i, guessChar);
                    correctCount++;
                } else if (guessChar != secrectStrCharArr[i]) {
                    triesCount++;
                    System.out.println("Incorrect: " + triesCount);hangmanImage(triesCount,correctCount);
                }
            }
        }
    }
}

我尝试在此处查找，但找不到子/超类中使用的 setter 和 getter

Answer 1

就像 rohit 说的，这就像了解 OOP 的基础知识一样简单，具体的封装。

如果您想更深入地了解 OOP 模式，可以使用观察者模式。这允许您更改任何类实例的状态，即使它们与继承、聚合等无关。

您可以通过制作观察者列表来扩展解决方案

你的可观察界面

public interface IObservable {
  // Set the observer
  public void setObserver(IObserver iObserver);

  // Notify the observer the current status
  public void notifyObserver();
}

你的观察者界面

public interface IObserver {
  public void update(boolean status);
}

你的观察者实现

public class PlayHangman implements IObserver {
  private boolean status = false;

  public void printStatus() {
      System.out.println("Status: " + (this.status ? "Win" : "Lose"));
  }

  @Override
  public void update(boolean status) {
      // The instance status is updated
      this.status = status;
      // Print the current status
      this.printStatus();
  }
}

你的可观察实现

public class Hangman implements IObservable{
  private String goalWord = "";
  private String currentWord = "";
  private int triesLimit = 0;
  private int tries = 0;
  private IObserver iObserver;

  public Hangman(String goalWord, int triesLimit) {
      this.goalWord = goalWord;
      this.triesLimit = triesLimit;
  }

  public void setCurrentWord(String currentWord) {
      this.currentWord = currentWord;
      this.notifyObserver();
  }

  public void addTry() {
      this.tries++;
      this.notifyObserver();
  }

  @Override
  public void setObserver(IObserver iObserver) {
      this.iObserver = iObserver;
  }

  @Override
  public void notifyObserver() {
    // True = win
    this.iObserver.update(this.tries < this.triesLimit && 
    this.goalWord.equals(this.currentWord));
  }
}

你的主课

public class Main{
  public static void main(String[] args) {
    // PlayHangman (game status)
    PlayHangman playHangman = new PlayHangman();
    // Hangman initializes with a goalWord and the triesLimit
    Hangman hangman = new Hangman("HangmanJava", 5);
    // Set the observer
    hangman.setObserver(playHangman);
    // During the game you just can set the current word and add a try
    // You're not setting the status directly, that's the magic of the Observer pattern
    hangman.setCurrentWord("Hang");
    hangman.addTry();
    hangman.setCurrentWord("HangmanJava");
  }
}

希望这有助于并享受 Java

Answer 2

您需要在 main 方法中创建该类的一个实例，以便像这样访问该类中可用的变量和方法

public class PlayHangman {

        public static void main(String[] args) {
       Hangman hangman = new Hangman();
       hangman.setTriesLimit(2)
        int value = hangman.getTriesLimit();

     }

您可以查看静态关键字以直接访问该值，但这需要对 OOP 和 JAVA 有更多了解。 这应该可以正常工作。

希望对你有帮助:)

已编辑

ToString 方法只是将模型类中的所有内容转换为您已正确完成的字符串，但您实现不正确.... 更改您的 ToString 内容

@Override
public String toString() {
    return ("The Secret Word you entered: " + this.getWord()
            + ".\n The max # of tries (Must be under 7): "
            + this.getTriesLimit());
}

你已经初始化了你想要的扫描器，要求用户输入值，但你还没有实现它，所以把它添加到你的主要方法中

    Scanner scn = new Scanner(System.in);
         hangman.setTriesLimit(scn.nextInt());
        hangman.setWord(scn.next());
       hangman.toString()//Will work now

试错现在是你最好的朋友 :) 和谷歌一些问题而不是等待答案:)