在文本中，给定长度的单词应替换为分配的字符串（一些随机单词）。输出初始文本和结果

Question

禁止使用正则表达式处理工具:java.util.regex包类(Pattern，Matcher等。)，以及String类的方法(matches、replace、replaceFirst、replaceAll、split)。使用StringBuilder或StringBuffer。帮忙做任务。

public static void main(String[] args) {
        String[] arr = new String[4];
        arr[0] = "I";
        arr[1] = "love";
        arr[2] = "orange";
        arr[3] = "juice.";
        System.out.println(arr[0]+" "+ arr[1]+" " + arr[2]+" "+ arr[3]); // I love orange juice
        String randomWord = "crazy impressed of ";
        int givenLength = 4;
        for (int i=0; i<arr.length; i++){
            if (arr[i].length() == givenLength) {
                arr[i] = randomWord;
            }
        }
        String output = String.join(" ",arr);
        System.out.println(output); // I crazy impressed of orange juice
        }

我必须在代码中使用StringBuilder和StringBuffer，但我不知道如何做到这一点。请帮帮我。你可以使用类

Answer 1

可能你需要这样的东西:

public static void main(String[] args) {
    String input = "all words like willbereplaced with length like word replacedwillbe";
    int givenLength = 14;
    StringBuilder builder = new StringBuilder();
    int currentWordLength = 0;
    for(char let: input.toCharArray()) {
        if(' ' == let){
            if(currentWordLength == givenLength) {
                builder.replace(builder.length() - givenLength, builder.length(), getRandom());
            }
            currentWordLength = 0;
        } else {
            currentWordLength++;
        }
        builder.append(let);
    }
    if(currentWordLength == givenLength) {
        builder.replace(builder.length() - givenLength, builder.length(), getRandom());
    }

    System.out.println(input);
    System.out.println(builder.toString());
}

static String getRandom() {
    return Math.random() < 0.5 ? "random1" : "random2";
}