Java练习22

序列化集合

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
public class Demo2 {
    public static void main(String[ ] args) throws Exception {
        // 创建 学生对象
        Student student = new Student("老王", "laow") ;
        Student student2 = new Student("老张", "laoz") ;
        Student student3 = new Student("老李", "laol") ;
        ArrayList<Student> arrayList = new ArrayList<>() ;
        arrayList. add(student) ;
        arrayList. add(student2) ;
        arrayList. add(student3) ;
        // 序列化操作
         serializ(arrayList) ;
        // 反序列化
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream("list.txt") ) ;
        // 读取对象, 强转为ArrayList类型
        ArrayList<Student> list = (ArrayList<Student>) ois. readObject() ;
        for (int i = 0; i < list. size() ; i++ ) {
            Student s = list. get(i) ;
            System. out. println(s. getName() +"‐‐"+ s. getPwd() ) ;
        }
    }
    private static void serializ(ArrayList<Student> arrayList) throws Exception {
        // 创建 序列化流
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("list.txt") ) ;
        // 写出对象
        oos. writeObject(arrayList) ;
        // 释放资源
        oos. close() ;
    }
}
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