How to save and read user information (username ,password,and so on) by serializable?

Is write all User information to o开发者_运维问答nly a file ,or every user has a self file ? And how to write information or read information of someone?

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Here's a step-by-step guide to basic serializaiton in java:

1. Import java.io.Serializable

2. List item

Get your data-containing class to implement Serializable.

    public class MyClass implements Serializable {

3. Use an Object I/O stream to read/write your objects from files.

Here is a great concise tutorial: http://www.javabeginner.com/uncategorized/java-serialization