Java Serialized Writing.

package app;

import java.awt.Color;

public class Rectangle implements java.io.Serializable {
  private int length;
  private int width;
  // This member variable will not be Serialized as it is transient.
  transient private Color color;

  public Rectangle () {}
  public Rectangle(int width, int length, Color color) {
   this.length=length;
   this.width=width;
   this.color=color;
  }

  @Override
  public String toString() {
    return  " width: " + width + " length: " + length +" color: "+color;
  }

  public int getLength() {
    return length;
  }

  public void setLength(int length) {
    this.length = length;
  }

  public int getWidth() {
    return width;
  }

  public void setWidth(int width) {
    this.width = width;
  }

  public Color getColor() {
    return color;
  }

  public void setColor(Color color) {
    this.color = color;
  }
}

package app;

import java.awt.Color;
import java.io.*;

public class WriteObj {
  public static void main(String args[]) {
    Rectangle rect = new Rectangle(25, 60, Color.blue);
    ObjectOutputStream out = null;
    try {
      out = new ObjectOutputStream(new FileOutputStream("Rectangle.ser"));
      out.writeObject(rect);
      System.out.println("Wrote Rectangle with \"" + rect + "\" to file");
    }
    catch (IOException e) {
      System.err.println("Error writing object: " + e.getMessage());
    }
    finally {
      try {
        out.close();
      }
      catch (IOException e) {
        System.err.println(e.getMessage());
      }
    }
  }
}