Read / Write data in a file for transient field using ObjectOutputStream

Using ObjectOutputStream class & transient keyword:

1. import java.io.File;
2. import java.io.FileOutputStream;
3. import java.io.ObjectOutputStream;
4. import java.io.Serializable;
5. 
   
6. class Employee implements Serializable {
7. 
   
8. private static final long serialVersionUID = 1L;
9. int id;
10. String name;
11. // double salary;
12. transient double salary;
13. 
    
14. public Employee(int id, String name, double salary) {
15. this.id = id;
16. this.name = name;
17. this.salary = salary;
18. }
19. 
    
20. @Override
21. public String toString() {
22. return "[id: " + id + ", name: " + name + ", salary: " + salary + "]";
23. }
24. }
25. 
    
26. public class WriteByObjectOutputStreamExe {
27. 
    
28. public static void main(String[] args) throws Exception {
29. File file = new File("D:\\data1.txt");
30. FileOutputStream fileStream = new FileOutputStream(file);
31. ObjectOutputStream objStream = new ObjectOutputStream(fileStream);
32. 
    
33. Employee e1 = new Employee(101, "suresh", 2000);
34. 
    
35. objStream.writeObject(e1);
36. objStream.flush();
37. objStream.close();
38. }
39. }

Output:
ͭ sr  com.ishaan.filehandling.Employee        I idL namet Ljava/lang/String;xp   et suresh

Read transient field data from a file using ObjectInputStream:

1. import java.io.File;
2. import java.io.FileInputStream;
3. import java.io.ObjectInputStream;
4. 
   
5. public class ReadFileByObjectInputStreamExe {
6. 
   
7. public static void main(String[] args) throws Exception {
8. File file = new File("D:\\data1.txt");
9. FileInputStream fileStream = new FileInputStream(file);
10. ObjectInputStream objStream = new ObjectInputStream(fileStream);
11. 
    
12. Employee emp = (Employee) objStream.readObject();
13. 
    
14. System.out.println(emp.toString());
15. objStream.close();
16. }
17. }

Output: 
[id: 101, name: suresh, salary: 0.0]