Question

此代码不是产生任何输出，而是在我使用“导入”的行上引发错误。效用。我不知道如何删除此错误。请帮忙！我是新手。我在＆＃39; Head First Java＆＃39;中读到了这段代码。由Sierra。

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("toys.com");
        DotCom three = new DotCom();
        three.setName("go.com");
        dotComsList.add(one);
        dotComsList.add(two);
        dotComsList.add(three);
        System.out.println("sink all coms");
        System.out.println("jk yhhg  jyhhj ");
        System.out.println("in small no of guesses");
        for (DotCom dotComToSet: dotComsList) {
            ArrayList < String > newLoction = helper.placeDotCom(3);
            dotComToSet.setLocationCells(newLocation);

        }
    }
    private void stratPlaying() {
        while (!dotComsList.isEmpty()) {
            String userGuess = helper.getUserInput("enter a number");
            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 d are dead");

        if (numOfGuesses <= 18) {
            System.out.println("you took " + numOfGuesses);
            System.out.println("u got out");
        } else {
            System.out.println("took u long " + numOfGuesses);
            System.out.println("u are worst");
        }
    }
    public static void main(String[] args) {
        DotComBust game = new DotComBust();
        game.setUpGame();
        game.startPlaying();
    }
}
import java.util.*;
public class DotCom {
    private ArrayList < String > locationCells;
    private String name;
    public void setLocationCells(ArrayList < String > loc) {
        locationCells = loc;
    }
    public void setName(String n) {
        name = n;
    }
    public String checkYourself(String userInput) {
        String result = "miss";
        int index = locationCells.indexOf(userInput);
        if (index <= 0) {
            locationCells.remove(index);
            if (locationCells.isEmpty()) {
                result = "kill";
                System.out.println("you sunk " + name);
            } else {
                result = "hit";
            }
        }
        return result;
    }
}

Answer 1

您不应将所有内容都放在一个文件中。创建一个新文件DotCom并粘贴下面的代码

import java.util.*;
public class DotCom {
    private ArrayList < String > locationCells;
    private String name;
    public void setLocationCells(ArrayList < String > loc) {
        locationCells = loc;
    }
    public void setName(String n) {
        name = n;
    }
    public String checkYourself(String userInput) {
        String result = "miss";
        int index = locationCells.indexOf(userInput);
        if (index <= 0) {
            locationCells.remove(index);
            if (locationCells.isEmpty()) {
                result = "kill";
                System.out.println("you sunk " + name);
            } else {
                result = "hit";
            }
        }
        return result;
    }
}

请务必从DotComBust删除上述代码。

1个Java源文件中不能存在2个相同的导入（import java.util.*; import java.util.*）。您需要做的是将其拆分为2个源文件或删除第二个导入文件。

Java＆＃39;导入＆＃39;效用不起作用

1 个答案: