File Input Output Java

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  4. Use ObjectOutputStream and ObjectInputStream to write and read Hashtable
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.util.Hashtable;
public class Main {
  public static void main(String[] args) throws Exception {
    Hashtable h = new Hashtable();
    h.put("string", "AAA");
    h.put("int", new Integer(26));
    h.put("double", new Double(Math.PI));
    FileOutputStream fileOut = new FileOutputStream("hashtable.ser");
    ObjectOutputStream out = new ObjectOutputStream(fileOut);
    out.writeObject(h);
      
    FileInputStream fileIn = new FileInputStream("h.ser");
    ObjectInputStream in = new ObjectInputStream(fileIn);
    Hashtable h = (Hashtable)in.readObject(  );
    System.out.println(h.toString(  ));      
  }
}