Can list, set and maps be Serialized and DeSerialized in java





ArrayList, HashSet and HashMap implements Serializable interface, so if we will use them as member of class they will get Serialized and DeSerialized as well.




Full Program/SourceCode to show list, set and maps are Serializable and DeSerializable objects>


package serDeser6ListSetMap;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

/** Copyright (c), AnkitMittal JavaMadeSoEasy.com */

/*Author : AnkitMittal  Copyright- contents must not be reproduced in any form*/
class MyClass implements Serializable {
  
   private static final long serialVersionUID = 1L;
   private List<Integer> list;
   private Set<Integer> set;
   private Map<Integer,Integer> map;
  
   public MyClass(List<Integer> list, Set<Integer> set,
                 Map<Integer, Integer> map) {
          super();
          this.list = list;
          this.set = set;
          this.map = map;
   }
   @Override
   public String toString() {
          return "MyClass [list=" + list + ", set=" + set + ", map=" + map + "]";
   }
  
}
public class SerializeEmployee {
   public static void main(String[] args) {
          List<Integer> list=new ArrayList<Integer>();
          list.add(2);
          list.add(3);
          Set<Integer> set=new HashSet<Integer>();
          set.add(4);
          set.add(5);
          Map<Integer, Integer> map=new HashMap<Integer,Integer>();
          map.put(6, 34);
          map.put(7, 35);

          MyClass object1 = new MyClass(list,set,map);
          try {
                 OutputStream fout = new FileOutputStream("ser.txt");
                 ObjectOutput oout = new ObjectOutputStream(fout);
                 System.out.println("Serialization process has started, serializing objects...");
                 oout.writeObject(object1);
                 fout.close();
        oout.close();
        System.out.println("Object Serialization completed.");
                
                 //DeSerialization process >
                
                
                 InputStream fin=new FileInputStream("ser.txt");
                 ObjectInput oin=new ObjectInputStream(fin);
                 System.out.println("\nDeSerialization process has started, displaying objects...");
                 MyClass object=(MyClass)oin.readObject();
                 System.out.println(object);
                 fin.close();
       oin.close();
       System.out.println("Object DeSerialization completed.");
                
          } catch (IOException | ClassNotFoundException  e) {
                 e.printStackTrace();
          }
   }
}
/*OUTPUT
Serialization process has started, serializing objects...
Object Serialization completed.
DeSerialization process has started, dispalying objects...
MyClass [list=[2, 3], set=[4, 5], map={6=34, 7=35}]
Object DeSerialization completed.
*/

If we note output, we were successfully able to Serialize and DeSerialize list, set and map objects.




RELATED LINKS>

Serialization And Deserialization Tutorial


Serializing & DeSerializing >


serialVersionUID  >

More about Serialization >






Interviews >

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