如何检查之前是否输入了用户输入？

时间：2017-06-28 23:01:58

标签： java if-statement input evaluation

我创造了一个刽子手游戏。

我想问一下如何检查用户是否输入相同的字母。一切正常，但没有检查数字是否已经全部输入。

if (word.contains(input)) {
        i = i - 1;
        char[] charOfGameBoard = gameBoard.toCharArray();
        for (int x = 0; x < word.length(); x++) {
            if (word.charAt(x) != input.charAt(0)) {
                continue;
            }

            int j = x * 2;
            charOfGameBoard[j] = input.charAt(0);
        }

        gameBoard = String.valueOf(charOfGameBoard);

    }

我不能过多地发帖。

  

word =“house”

     

charOfGameBoard = _ _ _ _ _

     

userinput =“h”//正确

     

charOfGameBoard = h _ _ _ _

     

userinput =“h”//此时不正确

     

charOfGameBoard = h _ _ _ _

3 个答案:

答案 0 :(得分：2)

您可以将猜测存储在2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - ERROR (version 7.0.0.0-25, build 1 from 2016-11-05 15.35.36 by buildguy) : Unable to connect to repository 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - ERROR (version 7.0.0.0-25, build 1 from 2016-11-05 15.35.36 by buildguy) : org.pentaho.di.core.exception.KettleException: 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - Error connecting to the repository! 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - No repository exists on the specified connection. To create a repository, select the Edit' button followed by the 'Create or upgra de' button. 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.repository.kdr.delegates.KettleDatabaseRepositoryConne ctionDelegate.connect(KettleDatabaseRepositoryConnectionDelegate.java:165) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.repository.kdr.KettleDatabaseRepository.connect(Kettle DatabaseRepository.java:193) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.repository.kdr.KettleDatabaseRepository.connect(Kettle DatabaseRepository.java:182) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.repo.RepositoryConnectController.connectToRepositor y(RepositoryConnectController.java:217) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.repo.RepositoryConnectController.connectToRepositor y(RepositoryConnectController.java:201) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.repo.RepositoryDialog$12.function(RepositoryDialog. java:179) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.browser.WebSite.Invoke(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.browser.WebSite$7.method6(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.internal.ole.win32.COMObject.callback6(Unknown Source ) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.internal.win32.OS.DispatchMessage(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.repo.RepositoryDialog.open(RepositoryDialog.java:25 4) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.repo.RepositoryDialog.open(RepositoryDialog.java:85 ) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.repo.RepositoryDialog.open(RepositoryDialog.java:81 ) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.repo.RepositoryDialog.openManager(RepositoryDialog. java:263) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.repo.RepositoryConnectMenu$3$2.widgetSelected(Repos itoryConnectMenu.java:176) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.widgets.TypedListener.handleEvent(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.widgets.EventTable.sendEvent(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.widgets.Display.sendEvent(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.widgets.Widget.sendEvent(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.widgets.Display.runDeferredEvents(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.eclipse.swt.widgets.Display.readAndDispatch(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.spoon.Spoon.readAndDispatch(Spoon.java:1359) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.spoon.Spoon.waitForDispose(Spoon.java:7990) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.spoon.Spoon.start(Spoon.java:9290) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.ui.spoon.Spoon.main(Spoon.java:685) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at java.lang.reflect.Method.invoke(Unknown Source) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.commons.launcher.Launcher.main(Launcher.java:92) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - Caused by: org.pentaho.di.core.exception.KettleException: 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - No repository exists on the specified connection. To create a repository, select the Edit' button followed by the 'Create or upgra de' button. 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.repository.kdr.delegates.KettleDatabaseRepositoryConne ctionDelegate.verifyVersion(KettleDatabaseRepositoryConnectionDelegate.java:213) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - at org.pentaho.di.repository.kdr.delegates.KettleDatabaseRepositoryConne ctionDelegate.connect(KettleDatabaseRepositoryConnectionDelegate.java:151) 2017/07/04 13:48:00 - class org.pentaho.di.ui.repo.RepositoryConnectController - ... 31 more

中 
HashSet

HashSet<char> guessedLetters = new HashSet(); ... boolean success = guessedLetters.Add(input) 只能包含每个值中的一个，如果该集合已包含要添加的元素，则HashSet方法将返回false。

https://www.javatpoint.com/java-hashset

答案 1 :(得分：0)

您可以在输入时将字符添加到数组列表中，并检查您之前是否看过该字母：

ArrayList<Character> usedLetters = new ArrayList<>();
public boolean UserTypedLetterBefore(char letter) {
    if(usedLetters.contains(letter))
        return true;

    usedLetters.add(letter);
    return false;
}

然后当游戏结束时，您只需致电usedLetters.clear()清空列表并重新开始。此方法还可以通过执行usedLetters.size()来跟踪猜测次数，因为每个猜测都是一个字母

如果您想提高效率，可以使用HashSet代替（虽然在您的情况下不需要）：

HashSet<Character> usedLetters = new HashSet<>();
public boolean UserTypedLetterBefore(char letter) {
    if(usedLetters.contains(letter))
        return true;

    usedLetters.add(letter);
    return false;
}

对于较大的数据集，这将是理想的选择，但在您的情况下，因为您只有26个可能的字母，所以您不会注意到速度差异。

第三种选择是使用原始数组，如下：

boolean[] usedLetters = new boolean[26];
public boolean UserTypedLetterBefore(char letter) {
    letter = Character.toLowerCase(letter);

    if(usedLetters[letter - 'a'])
        return true;

    usedLetters[letter - 'a'] = true;
    return false;
}

每个索引都是使用该字母的标志。通过对字符letter - 'a'执行数学运算，我们可以生成'a' = 0，这样我们就可以将它用作我们所需数组中的索引。 Character.toLowerCase()作为安全添加。

答案 2 :(得分：0)

您可以进行List猜测，并在if语句中添加其他条件，如下所示：

List<String> guesses = new ArrayList<>();

if (word.contains(input) && !guesses.contains(input)) {
    guesses.add(input);
    //...
    //all of your other code
    //...
}
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