package vo; 
 
import java.io.Serializable; 
 
public class Animal implements Serializable { 
  private static final long serialVersionUID = 1L; 
  private String name; 
  private Integer weight; 
  private String color; 
  private String type; 
  private Integer age; 
  private Integer lifetime; 
  public String getName() { 
    return name; 
  } 
  public void setName(String name) { 
    this.name = name; 
  } 
  public Integer getWeight() { 
    return weight; 
  } 
  public void setWeight(Integer weight) { 
    this.weight = weight; 
  } 
  public String getColor() { 
    return color; 
  } 
  public void setColor(String color) { 
    this.color = color; 
  } 
  public String getType() { 
    return type; 
  } 
  public void setType(String type) { 
    this.type = type; 
  } 
  public Integer getAge() { 
    return age; 
  } 
  public void setAge(Integer age) { 
    this.age = age; 
  } 
  public Integer getLifetime() { 
    return lifetime; 
  } 
  public void setLifetime(Integer lifetime) { 
    this.lifetime = lifetime; 
  } 
  public Animal(String name, Integer weight, String color, String type, Integer age, Integer lifetime) { 
    super(); 
    this.name = name; 
    this.weight = weight; 
    this.color = color; 
    this.type = type; 
    this.age = age; 
    this.lifetime = lifetime; 
  } 
  @Override 
  public String toString() { 
    return "Animal [name=" + name + ", weight=" + weight + ", color=" + color + ", type=" + type + ", age=" + age + ", lifetime=" + lifetime + "]"; 
  } 
   
} 

package objectstream; 
 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream; 
import java.io.ObjectInputStream; 
import java.io.ObjectOutputStream; 
 
import vo.Animal; 
 
public class TestObjectStream { 
  public static void main(String[] args) { 
    try { 
      ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File("d:/oos.dat"))); 
      Animal a1 = new Animal("tiger", 120, "red", "cat", 12, 20); 
      Animal a2 = new Animal("eagle", 10, "gold", "bird", 6, 10); 
      oos.writeObject(a1); 
      oos.writeObject(a2); 
      oos.flush(); 
      oos.close(); 
       
      ObjectInputStream ois = new ObjectInputStream(new FileInputStream("d:/oos.dat")); 
      Animal ra1 = (Animal) ois.readObject(); 
      System.out.println(ra1.toString()); 
      Animal ra2 = (Animal) ois.readObject(); 
      System.out.println(ra2.toString()); 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
} 

Animal [name=tiger, weight=120, color=red, type=cat, age=12, lifetime=20] 
Animal [name=eagle, weight=10, color=gold, type=bird, age=6, lifetime=10]