序列化心得

zhaibing_2008

package SerializeDemo;import java.io.*;public class Fruit  implements Serializable {int size = 42;Fruit(String s) {System.out.println("fruit...");}Fruit() {System.out.println("fruit...");}}package SerializeDemo;import java.io.*;public class Apple extends Fruit{int as = 3;private transient String s = "I'm not serializable..." ;public Apple() {//super("aa");System.out.println("the as is :" + as);}public void writeObject(ObjectOutputStream os) {try {os.defaultWriteObject();os.writeObject(s);} catch (IOException e) {e.printStackTrace();}System.out.println("invoke the writeObject...");}public void readObject(ObjectInputStream os) {System.out.println("invoke the readObject...");try {os.defaultReadObject();//s = (String)os.readObject();} catch (IOException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();}}public Apple readApple(FileInputStream is) {Apple a = null;try {ObjectInputStream ois = new ObjectInputStream(is);a = (Apple)ois.readObject();ois.close();}catch(Exception e) {e.printStackTrace();}return a;}public void saveApple(FileOutputStream os,Object obj) {try {ObjectOutputStream oos = new ObjectOutputStream(os);oos.writeObject(obj);oos.close();}catch(Exception e) {e.printStackTrace();}}public static void main(String[] args) {try {FileOutputStream fos = new FileOutputStream("Apple.txt");FileInputStream fis = new FileInputStream("Apple.txt");Apple a = new Apple();a.size = 20;  //super original 42a.as = 20;a.saveApple(fos, a);Apple b = a.readApple(fis);//System.out.println("b.size is:"+b.size+"\tb.as is:"+b.as);System.out.println("b.size is:"+b.size+"\tb.as is:"+b.as+"\tb.food is:"+b.s);}catch(Exception e) {e.printStackTrace();}}}