Question

创建一种将文本追加到现有文件中的方法，但是我不断收到错误消息

请注意，我只粘贴了一个方法，而不是整个代码。

错误：

Exception in thread "main" java.util.NoSuchElementException: No line found
at java.util.Scanner.nextLine(Unknown Source)
at Roster.Team.add(Team.java:47)
at Roster.Main.main(Main.java:22)

代码：

    public void add(){
    System.out.println("Enter the name of the file that you wish to add information to: ");
    String name;
    name = scan.nextLine();
    try{
       BufferedWriter writer = new BufferedWriter(new FileWriter(name, true));
        for(Player p : x)
            if(p != null){
                writer.write(p + "\n");
                writer.newLine();
            }
        writer.close();
    } catch (IOException e) { }
}

Answer 1

您收到此错误，因为在扫描仪中未找到任何行，请在代码中添加check

if (scan.hasNextLine()) {
    System.out.println("Enter the name of the file that you wish to add information to: ");
    String name;
    name = scan.nextLine();
    try{
       BufferedWriter writer = new BufferedWriter(new FileWriter(name, true));
        for(Player p : x)
            if(p != null){
                writer.write(p + "\n");
                writer.newLine();
            }
        writer.close();
    } catch (IOException e) { 
        // it is better to log exception here
        e. printStackTrace();
    }
} else {
    System.out.println("Scanner has no lines to read.");
}

检查tutorial如何在Java中使用扫描仪。

java.util.NoSuchElementException错误，scan.next（）问题

1 个答案: