Java - 如何将 ArrayList 对象写入 txt 文件？
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Java - How to write ArrayList Objects into txt file?
提问by lawZ
/** I have some methods likes add,display,sort,delete,and exit that implemented the ArrayList function. It works correctly, but the problem is that the objects that had been added were not saved on a .txt file, just the temporary objects. So I need to add them into text file,so that I can display and delete them later. Here's the part of the codes. */
/** 我有一些方法，比如添加、显示、排序、删除和退出，实现了 ArrayList 函数。它工作正常，但问题是添加的对象没有保存在 .txt 文件中，只是临时对象。所以我需要将它们添加到文本文件中，以便稍后显示和删除它们。这是代码的一部分。*/
public class testing {
public static void main(String[] args) {
String Command;
int index = 0;
Scanner input = new Scanner(System.in);
ArrayList<String> MenuArray = new ArrayList<String>();
boolean out = false;
while (!out) {
System.out.print("Enter your Command: ");
Command = input.nextLine();
// method ADD for adding object
if (Command.startsWith("ADD ") || Command.startsWith("add ")) {
MenuArray.add(Command.substring(4).toLowerCase());
// indexing the object
index++;
/** i stuck here,it won't written into input.txt
BufferedWriter writer = new BufferedWriter(new FileWriter(
"input.txt"));
try {
for (String save : MenuArray) {
int i = 0;
writer.write(++i + ". " + save.toString());
writer.write("\n");
}
} finally {
writer.close();
}*/
} else if (Command.startsWith("EXIT") || Comand.startsWith("exit")) {
out = true;
}
}
}
}
采纳答案by anubhava
You can use ObjectOutputStreamto write an object into a file:
您可以使用ObjectOutputStream将对象写入文件：
try {
FileOutputStream fos = new FileOutputStream("output");
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(MenuArray); // write MenuArray to ObjectOutputStream
oos.close();
} catch(Exception ex) {
ex.printStackTrace();
}
回答by sp00m
FileUtils#writeLinesseems to do exactly what you need.
FileUtils#writeLines似乎正是您所需要的。
