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Java Tutorial : Java IO (Java Serialization with array or collection) |
import java.io.Serializable; public class Employee implements Serializable { private static final long serialVersionUID = 765764534241652904L; private int id; private String name; public Employee(int id, String name) { super(); this.id = id; this.name = name; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } }
import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectOutputStream; import java.util.ArrayList; public class SerializationDemo { public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException { SerializationDemo serializationDemo = new SerializationDemo(); serializationDemo.writeEmployeeObject(); } private void writeEmployeeObject() throws FileNotFoundException, IOException { FileOutputStream fileOutputStream = null; ObjectOutputStream objectOutputStream = null; try { fileOutputStream = new FileOutputStream("employee.tmp"); objectOutputStream = new ObjectOutputStream(fileOutputStream); Employee employee1 = new Employee(101, "Peter"); Employee employee2 = new Employee(102, "Dave"); Employee employee3 = new Employee(103, "Ram"); ArrayList<Employee> listOfEmployees = new ArrayList<Employee>(); listOfEmployees.add(employee1); listOfEmployees.add(employee2); listOfEmployees.add(employee3); /* * Write the specified object to the * ObjectOutputStream. */ objectOutputStream.writeObject(listOfEmployees); System.out .println("Successfully written list of employee objects to the file.\n"); } finally { if (objectOutputStream != null) { /* * Closing a ObjectOutputStream will also * close the OutputStream instance to which * the ObjectOutputStream is writing. */ objectOutputStream.close(); } } } }
Successfully written list of employee objects to the file.employee.tmp
DeSerializationDemo.java
import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.ObjectInputStream; import java.util.ArrayList; public class DeSerializationDemo { public static void main(String[] args) throws FileNotFoundException, IOException, ClassNotFoundException { DeSerializationDemo deSerializationDemo = new DeSerializationDemo(); deSerializationDemo.readEmployeeObject(); } private void readEmployeeObject() throws IOException, FileNotFoundException, ClassNotFoundException { FileInputStream fileInputStream = null; ObjectInputStream objectInputStream = null; try { fileInputStream = new FileInputStream("employee.tmp"); objectInputStream = new ObjectInputStream(fileInputStream); /* * Read an object from the ObjectInputStream. */ ArrayList<Employee> listOfEmployees = (ArrayList<Employee>) objectInputStream .readObject(); System.out .println("Successfully read list of employee objects from the file.\n"); for (Employee employee : listOfEmployees) { System.out.println("Id = " + employee.getId()); System.out.println("Name = " + employee.getName()); System.out.println("--------------------------"); } } finally { if (objectInputStream != null) { /* * Closing a ObjectInputStream will also * close the InputStream instance from which * the ObjectInputStream is reading. */ objectInputStream.close(); } } } }
Successfully read list of employee objects from the file. Id = 101 Name = Peter -------------------------- Id = 102 Name = Dave -------------------------- Id = 103 Name = Ram --------------------------
https://sites.google.com/site/ramj2eev1/home/javabasics/JavaIODemo_Serialization_Collection_App.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/JavaIODemo_Serialization_Collection_App
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/9ef303db3f229fc70e7cf47baac5692282611e62/BasicJava/JavaIODemo_Serialization_Collection_App/?at=master
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