java：從ArrayList中刪除單詞<String>

Question

假設我的單詞Array是words = {“ a”，“ the”，“ in”，“ if”，“ are”，“ it”，“ is”}}，而我的ArrayList包含這樣的字符串{“表在這里”，“出售書本”，“如果可讀”}。 我想從arrayList中刪除array的所有單詞。 預期的輸出將是ArrayList，例如{“ table here”，“ books sold”，“ readable”}。

到目前為止，我已經嘗試過了：

public static void main(String[] args) {
        String[] words = {"a","the","in","if","are","it","is"};
        List<String> wordList = new ArrayList<String>(Arrays.asList(words));
        String[] tArray = {"a table is here", "books are sold","if it is readable"};
        List<String> list = new ArrayList<String>(Arrays.asList(tArray));

        for (int i = 0; i < list.size(); i++) {
            String[] tArrays = list.get(i).split(" ");
            List<String> line = new ArrayList<String>(Arrays.asList(tArrays));
                for (int c = 0; c < wordList.size(); c++) {
                    if (wordList.get(c).equals(line.get(i))) {
                        line.remove(i);
                        i--;
                        break;
                    }
                }//end for
            list.set(i, String.join(" ", line));
        }//end for
        for(String string : list) 
        {
            System.out.println(string);
        }
    }

但沒有給出預期的輸出。 而是給出錯誤“ java.lang.ArrayIndexOutOfBoundsException：-1”

Answer 1

根據“”分割后，您應該使用line.size()迭代所有單詞。

for (int i = 0; i < list.size(); i++) {
        String[] tArrays = list.get(i).split(" ");
        List<String> line = new ArrayList<>(Arrays.asList(tArrays));
        for (int c = 0; c < wordList.size(); c++) {
            if (wordList.get(c).equals(line.get(i))) { // you get i for indexes corresponding to the sentence element and not `line` elements as created above
                line.remove(i); // i is iterated over the list of sentences in your case 3, would start from i=0
                i--; // you change it to '-1' and get IndexOutOfBounds
                break;
            }
        }//end for
        list.set(i, String.join(" ", line));
    }//end for

---

盡管未經測試，但是您可以執行以下操作-

public static void main(String[] args) {
    String[] words = {"a", "the", "in", "if", "are", "it", "is"};
    List<String> wordList = new ArrayList<>(Arrays.asList(words));
    String[] tArray = {"a table is here", "books are sold", "if it is readable"};
    List<String> list = new ArrayList<>(Arrays.asList(tArray));

    for (int i = 0; i < list.size(); i++) {
        String[] tArrays = list.get(i).split(" ");
        List<String> line = new ArrayList<>(Arrays.asList(tArrays));
        for (String lineElement : line) {
            if (wordList.contains(lineElement)) {
                line.remove(lineElement);
            }
        }

        list.set(i, String.join(" ", line));
    }

    for (String string : list) {
        System.out.println(string);
    }
}

Answer 2

只需添加執行這種過濾的java 8版本即可：

String[] filtered = 
        list.stream().map(statement -> Arrays.asList(statement.split(" ")))
                     .map(listOfWords -> listOfWords.stream()
                            .filter(word -> !wordList.contains(word))
                            .collect(Collectors.joining(" "))
                         )
                         .toArray(String[]::new);
List<String> filteredList = Arrays.asList(filtered);

您可以使用以下命令驗證輸出：

filteredList.stream().forEach(System.out::println);

希望這會有所幫助！