从句子中删除字符的Java程序

Question

我正在编写一个java程序，从句子中删除一个字符。我的代码是；

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;
    }

    int sentenceLength = sentence.length();
    int randomPosition = (int)(Math.random() * sentenceLength) + 0;
        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.deleteCharAt(randomPosition);
        return changedSentence;
    }

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

当我编译时，我收到一条错误消息:

Error: cannot find symbol symbol: method deleteCharAt(int) location: variable sentence of type java.lang.String

我花了几个小时试图解决这个问题，所以非常感谢您的帮助。

Answer 1

String 类没有 deleteCharAt 方法。 StringBuilder 有。

这样做:

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

我建议使用 Netbeans 或 Eclipse 等 IDE。这些开发工具会立即告诉您发生了什么。