Question

java 我想将一个装了对象的arraylist 写入文件，读出文件，请问怎么写代码，改对象的类定义如下

public class User {
private String name;
private String code;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public User(String name, String code) {
super();
this.name = name;
this.code = code;
}

}

Answer 1

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
public class User implements Serializable{
private String name;
private String code;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public User(String name, String code) {
super();
this.name = name;
this.code = code;
}
public static void writeUser(ArrayList<User> userList,File file){//file 为写入的文件
ObjectOutputStream oos;
try {
if(!file.exists())
file.createNewFile();
oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(userList);
oos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

}
有疑问可追问或者hi

Answer 2

序列化