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import java.util.*;
import java.io.*;

public class HashMapSerializeExample {
    public static void main(String args[]) {
        
    // Creating a HashMap of Integer keys and String values
    HashMap<Integer, String> hashmap = new HashMap<Integer, String>();
    hashmap.put(1, "Value1");
    hashmap.put(2, "Value2");
    hashmap.put(3, "Value3");
    hashmap.put(4, "Value4");
    hashmap.put(5, "Value5");
    try
           {
                  FileOutputStream fos =
                     new FileOutputStream("hashmap.ser");
                  ObjectOutputStream oos = new ObjectOutputStream(fos);
                  oos.writeObject(hmap);
                  oos.close();
                  fos.close();
                  System.out.printf("Serialized HashMap data is saved in hashmap.ser");
           }catch(IOException ioe)
            {
                  ioe.printStackTrace();
            }
  }
}


deserilize:


import java.util.*;

 public class HashMapDeserializeExample {
    public static void main(String args[]) {
        
    HashMap<Integer, String> map = null;
      try
      {
         FileInputStream fis = new FileInputStream("hashmap.ser");
         ObjectInputStream ois = new ObjectInputStream(fis);
         map = (HashMap) ois.readObject();
         ois.close();
         fis.close();
      }catch(IOException ioe)
      {
         ioe.printStackTrace();
         return;
      }catch(ClassNotFoundException c)
      {
         System.out.println("Class not found");
         c.printStackTrace();
         return;
      }
      System.out.println("Deserialized HashMap");
      // Display content using Iterator
      Set set = map.entrySet();
      Iterator iterator = set.iterator();
      while(iterator.hasNext()) {
         Map.Entry mentry = (Map.Entry)iterator.next();
         System.out.print("key: "+ mentry.getKey() + " & Value: ");
         System.out.println(mentry.getValue());
      }
  }
}