[Java] Object Serializable 筆記

1. import java.io.FileInputStream; 
2. import java.io.FileOutputStream; 
3. import java.io.ObjectInputStream; 
4. import java.io.ObjectOutputStream; 
5. import java.io.Serializable; 
6.  
7. class Address implements Serializable { 
8.  
9.    private static final long serialVersionUID = 1L; 
10.  
11.    String street; 
12.    String country; 
13.  
14.    public Address() {} 
15.  
16.    public Address(String s, String c) { 
17.        street = s; country = c; 
18.    } 
19.  
20.    public void setStreet(String street){ this.street = street; } 
21.    public String getStreet(){ return this.street; } 
22.  
23.    public void setCountry(String country){ this.country = country; } 
24.    public String getCountry(){ return this.country; } 
25.  
26.    @Override 
27.    public String toString() { 
28.        return String.format("Street : %s Country : %s", street, country); 
29.    } 
30. } 
31.  
32.  
33. public class TestSerializable { 
34.  
35.    public static void main(String[] args) throws Exception { 
36.        Address addr = new Address("wall street", "united state"); 
37.  
38.        FileOutputStream fout = new FileOutputStream("address.ser"); 
39.        ObjectOutputStream oos = new ObjectOutputStream(fout); 
40.        oos.writeObject(addr); 
41.        oos.close(); 
42.  
43.        FileInputStream fin = new FileInputStream("address.ser"); 
44.        ObjectInputStream ois = new ObjectInputStream(fin); 
45.        Address addr2 = (Address) ois.readObject(); 
46.        ois.close(); 
47.  
48.        System.out.println(addr2); 
49.        // Street : wall street Country : united state 
50.    } 
51. } 

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

class Address implements Serializable {

    private static final long serialVersionUID = 1L;

    String street;
    String country;

    public Address() {}

    public Address(String s, String c) {
        street = s; country = c;
    }

    public void setStreet(String street){ this.street = street; }
    public String getStreet(){ return this.street; }

    public void setCountry(String country){ this.country = country; }
    public String getCountry(){ return this.country; }

    @Override
    public String toString() {
        return String.format("Street : %s Country : %s", street, country);
    }
}


public class TestSerializable {

    public static void main(String[] args) throws Exception {
        Address addr = new Address("wall street", "united state");

        FileOutputStream fout = new FileOutputStream("address.ser");
        ObjectOutputStream oos = new ObjectOutputStream(fout);
        oos.writeObject(addr);
        oos.close();

        FileInputStream fin = new FileInputStream("address.ser");
        ObjectInputStream ois = new ObjectInputStream(fin);
        Address addr2 = (Address) ois.readObject();
        ois.close();

        System.out.println(addr2);
        // Street : wall street Country : united state
    }
}

參考自：
How to read an Object from file in Java : Mkyong
How to write an Object to file in Java : Mkyong
Understand the serialVersionUID : Mkyong