3. Serializable

• Only object that implements Serializable interface can be saved and restored by the serialization facilities.

• Serializable interface defines no operations.

• Why? Because the Serializable interface only indicates that a class may be serialized.

  
      import java.util.*;
      import java.io.*;
  
      class Person implements Serializable{
          private String name;
  
          public Person() {
          }
  
          public Person( String n ){
              System.out.println("In Person ctr");
              name = n;
          }
  
          String getName() {
              return name;
          }
      }