Question

我正在编写一个从句子中删除字符的java程序。我收到一条错误消息：对于java.Lang.String类型，方法charAt（int）是未定义的。 [第35行]

任何建议意味着什么。

public class Ex1Program {

public void start() {

String sentence = getSentenceFromUser();
int randomPosition = getRandomPosition(sentence);
printCharacterToBeRemoved(sentence, randomPosition);
String changedSentence = removeCharacter(sentence, randomPosition);
printNewSentence(changedSentence);

}

private String getSentenceFromUser() { 
System.out.print("Enter a sentence :");
String sentence = Keyboard.readInput();
return sentence;
}
private int getRandomPosition(String sentence) {
int randomPosition = (int)(Math.random() * 14) +1;
return randomPosition;
}

private void printCharacterToBeRemoved(String sentence, int randomPosition) {
System.out.print("Removing " + sentence.charAt(randomPosition) + " from position " +                 randomPosition);

}

private String removeCharacter(String sentence, int randomPosition) {
String changedSentence = sentence.trim().CharAt(randomPosition);
return changedSentence;
}

private void printNewSentence(String changedSentence) {
System.out.print("New sentence is " + changedSentence);
}
}

Answer 1

String changedSentence = sentence.trim().CharAt(randomPosition);

charAt而不是CharAt。但是，如果您进行了此更改，您仍然会尝试将char分配给应该持有String的变量。您可以使用Character.toString将字符转换为字符串。

P.S。如果要删除字符串中的字符，请使用StringBuilder：

String changedSentence = (new StringBuilder(sentence)).
                                         deleteCharAt(randomPosition).toString()

从句子中删除字符

1 个答案: