如何处理反转字符串上的标点符号和大写？

Question

我从 EditText 获取用户输入，将其反转然后在 TextView 上输出。一切正常，除了输入的字符串输出，例如StackOverflow is a community of awesome programmers!变成!programmers awesome of community a is StackOverflow。

现在我想：

• 当字符串反转时将第一个字母大写：Programmers awesome of community a is StackOverflow
• 将该感叹号或任何其他标点符号放在末尾而不是开头。我们的例子应该是：programmers awesome of community a is StackOverflow !

我使用下面的代码来反转字符串：

        String[] nowTyping = input.getText().toString().split(" ");
        ArrayList<String> wordArray = new ArrayList<>();
        for (String word : nowTyping) {
            wordArray.add(0, word);
        }
        String invertedSentence = TextUtils.join(" ", wordArray);
        output.setText(invertedSentence);

我已经尝试android:inputType="textCapWords" 将第一个字母大写，但似乎不起作用。 感谢您的宝贵时间。

Answer 1

试试这样的

String[] nowTyping = "It is broken!".split(" ");
            ArrayList<String> wordArray = new ArrayList<>();
            ArrayList<String> symbolsArray = new ArrayList<>();
            int cnt=0;
            for (int j=nowTyping.length-1 ;j >=0;j--) {
                String word = nowTyping[j];
                if (word.length()>0) {
                    word = word.toLowerCase();
                    char firstChar = word.charAt(0);
                    if (cnt == 0) {
                        boolean isFirstCharFounded = false;
                        for (int i = 0; i < word.length(); i++) {
                            if (!isFirstCharFounded&&Character.isAlphabetic(word.charAt(i))) {
                                firstChar = word.charAt(i);
                                isFirstCharFounded = true;
                            } else if (!(Character.isDigit(word.charAt(i))||Character.isAlphabetic(word.charAt(i)))) {
                                symbolsArray.add(word.charAt(i) + "");
                                word = word.replace(word.charAt(i)+"","");
                            }
                        }

                        firstChar = Character.toUpperCase(firstChar);
                        cnt++;
                    }
                    if (word.length()>=2) {
                        word = firstChar + word.substring(1);
                    }
                    else {
                        word = firstChar + "";
                    }

                    wordArray.add( word);
                }
            }
            String invertedSentence = TextUtils.join(" ", wordArray);
            invertedSentence += TextUtils.join("",symbolsArray);

Answer 2

您可以使用 StringBuilder：

    String invertedSentence = "!programmers awesome of community a is StackOverflow";
    StringBuilder stringBuilder = new StringBuilder(invertedSentence);

    if (!Character.isLetter(stringBuilder.charAt(0))) {
        char mark = stringBuilder.charAt(0);
        stringBuilder = stringBuilder.deleteCharAt(0);
        stringBuilder = stringBuilder.append(mark);
    }

    if (!Character.isUpperCase(stringBuilder.charAt(0))) {
        char mark = stringBuilder.charAt(0);
        stringBuilder = stringBuilder.deleteCharAt(0);
        stringBuilder = stringBuilder.insert(0, Character.toUpperCase(mark));
    }

    invertedSentence = stringBuilder.toString();