serialization DEMO

package HeadFirstJava;import java.io.*;@SuppressWarnings("serial")public class Box implements Serializable {    @SuppressWarnings("unused")    private int width;    @SuppressWarnings("unused")    private int height;        public void setWidth(int w) {        width = w;    }    public void setHeight(int h) {        height = h;    }    public static void main(String[] args) {        Box myBox = new Box();        myBox.setWidth(50);        myBox.setHeight(20);                try {            FileOutputStream fs = new FileOutputStream("foo.ser");            ObjectOutputStream os = new ObjectOutputStream(fs);            os.writeObject(myBox);            os.close();        } catch(Exception ex) {            ex.printStackTrace();        }    }}