Question

所以我试图读取一个包含int和字符串的文件。因此，主要目标是让用户输入参考编号和程序以吐出下面的行。我正在尝试使用线性搜索算法，这是文件：

 1<---Reference #
 The Adventures of Tom Sawyer<---Line to Spit out
 2
 Huckleberry Finn
 4
 The Sword in the Stone
 6
 Stuart Little
 10
 Treasure Island
 12
 The Secret Garden
 14
 Alice's Adventures in Wonderland
 20
 Twenty Thousand Leagues Under the Sea
 24
 Peter Pan
 26
 Charlotte's Web
 31
 A Little Princess
 32
 Little Women
 33
 Black Beauty
 35
 The Merry Adventures of Robin Hood
 40
 Robinson Crusoe
 46
 Anne of Green Gables
 50
 Little House in the Big Woods
 52
 Swiss Family Robinson
 54
 The Lion, the Witch and the Wardrobe
 56
 Heidi
 66
 A Winkle in Time
 100
 Mary Poppins

以下是我目前的代码：

   public class NewJFrame extends javax.swing.JFrame {

   ArrayList<Integer> colours = new ArrayList<Integer>();
   BufferedReader br = null;
/**
 * Creates new form NewJFrame
 */
public NewJFrame() {
    int word=0;

    try {
        br = new BufferedReader(new FileReader("Booklist.txt"));

        while ((word == br.read())){
            colours.add(word);
        }
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            br.close();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

    initComponents();
}

static public Boolean linearSearch(ArrayList colours, String B) {
    for (int k = 0; k < A.length; k++) {
        if (A[k].equals(B)) {
            return true;
        }
    }
    return false;
}

对于初学者来说，如果你可以帮助我至少正确阅读文件那就太棒了。

Answer 1

最简单的方法是使用地图。

Map<Integer,String> readFileasMap(String file) throws IOException{
    Map<Integer,String> map = new HashMap<>();
    BufferedReader br = new BufferedReader(new FileReader(file));
    String line;
    while((line = br.readLine()) != null){
        int number = Integer.parseInt(line);
        String text = br.readLine();
        map.put(number, text);
    }
    br.close();
    return map;
}

然后您可以使用map.get(index)返回相应的行如果你想把它与列表保持一致，那么函数非常相似。

List<Integer> indexes;
List<String> titles;
void readFileasLists(String file) throws IOException{
    indexes = new ArrayList<>();
    titles = new ArrayList<>();
    BufferedReader br = new BufferedReader(new FileReader(file));
    String line;
    while((line = br.readLine()) != null){
        int number = Integer.parseInt(line);
        String text = br.readLine();
        indexes.add(number);
        titles.add(text);
    }
    br.close();
    return;
}

使用bufferedReader从包含int和string的文件中读取

1 个答案: