這個方法用在復雜的對象中時非常好用， 如把一個JTree的對象寫入文件， 然后再直接從文件讀出，然后直接使用，出現的還是上次操作的狀態，如果自己去做這個工作， 會非常的困難。
import java.io.*;
// 在Java中系列化很簡單， 只要實現一個無函數的接口Serializable即可。
public class Student implements Serializable {
private static final long serialVersionUID = -6670528088216041285L;
private String name;
private int ID;
public Student(String name, int ID) {
this.name = name;
this.ID = ID;
}
public String getName() {
return name;
}
public int getID() {
return ID;
}
public static void main(String[] agrs) {
// 先產生幾個學生的對象
Student st1 = new Student("Google", 100);
Student st2 = new Student("Baidu", 101);
Student st3 = new Student("Yahoo", 102);
// 把對象寫入文件.
ObjectOutputStream oos = null;
try {
oos = new ObjectOutputStream(new FileOutputStream("data.txt"));
oos.writeObject(st1);
oos.writeObject(st2);
oos.writeObject(st3);
st1 = null;
st2 = null;
st3 = null;
} catch (IOException e) {
e.printStackTrace();
} finally {
if (oos != null) {
try {
oos.close();
oos = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
// 把對象從文件讀入.
ObjectInputStream ois = null;
try {
ois = new ObjectInputStream(new FileInputStream("data.txt"));
st3 = (Student) ois.readObject();
st2 = (Student) ois.readObject();
st1 = (Student) ois.readObject();
// 輸出從文件中讀取到的學生的信息， 用于查檢是否正確
System.out.println(st1.getName() + "'s ID is " + st1.getID());
System.out.println(st2.getName() + "'s ID is " + st2.getID());
System.out.println(st3.getName() + "'s ID is " + st3.getID());
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} finally {
if (ois != null) {
try {
ois.close();
ois = null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}