从文件加载 ArrayList
我刚刚将数组列表保存到文件中。现在我想将它加载回我的程序中，但它不起作用。这是我的代码：
public void loadgame(){
try {
System.out.println("1");
FileInputStream prein = new FileInputStream("saved game.txt");
System.out.println("2");
ObjectInputStream in = new ObjectInputStream(prein);
System.out.println("3");
kortene = (ArrayList<Kort>)in.readObject();
System.out.println("4");
in.close();
Iit 在 3 之后出现错误，错误是：
java.io.InvalidClassException: vendespil.Kort; local class incompatible: stream classdesc serialVersionUID = -8031146399228259151, local class serialVersionUID = -3342687010032791159
我的问题不是如何执行此操作，而是我已经按照其他人所说的做了，但它不起作用，我的问题是，为什么我会收到该错误，如果是因为我在保存和加载它之间更改了 ArrayList，我的意思是，我不更改文件，但在尝试加载它之前我确实清除了 ArrayList。
I've just saved an arraylist to a file. Now I want to load it back into my program, and it doesnt work. here is my code for it:
public void loadgame(){
try {
System.out.println("1");
FileInputStream prein = new FileInputStream("saved game.txt");
System.out.println("2");
ObjectInputStream in = new ObjectInputStream(prein);
System.out.println("3");
kortene = (ArrayList<Kort>)in.readObject();
System.out.println("4");
in.close();
Iit gets an error after 3, and the error is:
java.io.InvalidClassException: vendespil.Kort; local class incompatible: stream classdesc serialVersionUID = -8031146399228259151, local class serialVersionUID = -3342687010032791159
my problem isn't how to do this, but that i've done just what other people have said, and yet it doesn't work, my question is, why do i get that error, and if its because i change the ArrayList between saving it and loading it, i mean, i don't change the file, but i do clear the ArrayList before trying to load it.
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看起来您在保存对象和读回对象之间对保存的类进行了更改。
我想说，再次清理并构建您的项目，然后尝试使用新的保存操作。在写作和阅读之间不要改变课堂上的任何内容
Looks like you have made changes to the saved class in between saving objects and reading them back.
I would say, clean and build your project again and try it with a newly save operation. Don't change anything in classes in between writing and reading