Question

希望有人可以帮助一个初学的Java enthousiast。我有一个看起来像这样的文本文件：

"AB",101,"ABC","EFG"
"AB",102,"ABC","HIJ"
"AB",103,"ABC","HIJ"
"AB",104,"ABC","XYZ"
"AB",105,"ABC","XYZ"

我已使用以下代码阅读该文件：

List<String> list = null;
        try {
            flights = Files.readAllLines(Paths.get(pathToFile), StandardCharsets.UTF_8);
        } catch (IOException e) {
            System.out.println("No/wrong file");
        }

我知道有一个列表，其中每一行都是一个新元素。我想要做的是遍历此列表并检查每个元素的第四个值（＆＃34; EFG＆＃34;，＆＃34; HIJ＆＃34;等）并删除重复项。

如果有人能引导我朝着正确的方向前进，我将不胜感激。

Answer 1

HashSet<String> alreadyHandled = new HasSet<String>();
for(String line:flights){
    String[] parts = line.split(",");
    String lastPart = parts[parts.length-1]
    if(!alreadyHandled.contains(lastPart)){
        alreadyHandled.add(lastPart);

        //Here you have your code what you want to do with your line
    }
}

建议阅读文本文件和循环

1 个答案: