Java NotSerializableException用法及代碼示例

// Java Program to Illustrate NotSerializableException
// Where Exception Is Thrown
// Importing required classes
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
// Class 1
// Helper class
class Employee {
    // Member variables
    private String id;
    // Member methods
    // Method 1
    // To get ID of an employee
    public String getId() { return id; }
    // Method 1
    // To set ID of an employee
    public void setId(String id)
    {
        // this keyword refers to current object itself
        this.id = id;
    }
}
// Class 2
// Main Class
public class GFG {
    // Main driver method
    public static void main(String[] args)
        throws IOException
    {
        // Create FileOutputStream class object  to
        // create a file
        FileOutputStream out
            = new FileOutputStream("employee.dat");
        // Similarly creating ObjectOutputStream class
        // object
        ObjectOutputStream outputStream
            = new ObjectOutputStream(out);
        // Creating objects of class 1
        Employee obj = new Employee();
        // Assifning ID to an employee
        obj.setId("001");
        // Writing objects to stream
        outputStream.writeObject(obj);
        // Good practice is always to
        // Close the stream using close() method
        outputStream.close();
    }
}

// Java Program to Illustrate NotSerializableException
// where No Exception is Thrown Using Serializable interface
// Importing input output class
import java.io.Serializable;
// By implementing Serializable interface
// we are allowing Student object to
// be stored in TestFile.txt
// Class 1
// Helper class extending to Serializable interface
class Student implements Serializable {
    // Member variables of this class
    int id;
    String name;
    // Constructor of this class
    public Student(int id, String name)
    {
        this.id = id;
        this.name = name;
    }
}
// Class 2
// Main class
class Persist {
    // Main driver method
    public static void main(String args[])
    {
        // try block to check for exceptions
        try {
            // Creating the object
            Student s1 = new Student(007, "Test");
            // Creating stream and writing the object
            FileOutputStream fout
                = new FileOutputStream("TestFile.txt");
            ObjectOutputStream out
                = new ObjectOutputStream(fout);
            out.writeObject(s1);
            out.flush();
            // Closing the stream to free up memory space
            // using close() method
            out.close();
            // Display command to shown proper execution of
            // a program
            System.out.println(
                "Object stored successfully");
        }
        // Catch block to handle the exceptions
        catch (Exception e) {
            // Print and display the exception on the
            // console
            System.out.println(e);
        }
    }
}