externexample.java

实例精华

import java.io.*;

public class ExternExample implements Externalizable
{
  String name;
  String credictcard;
  int age;
  double salary;
  
  //当实现了Externalizable接口后，如果有read操作，必须要显示的声明一个无参数的构造
  public ExternExample()
  {
    System.out.println("没有参数的构造器被调用！");
  }

  
  public ExternExample(String ext_name,String ext_credictcard,
                       int ext_age,double ext_salary)
  {
    this.name = ext_name;
    this.credictcard = ext_credictcard;
    this.age = ext_age;
    this.salary = ext_salary;
  }
  
  //重写了Externalizable接口中的writeExternal方法
  public void writeExternal(ObjectOutput out) throws IOException
  {
    System.out.println("写入对象！");
    out.writeObject(name);
    out.writeInt(age);
    out.writeDouble(salary);
  }
  //重写了Externalizable接口中的readExternal方法
  public void readExternal(ObjectInput in) 
         throws IOException,ClassNotFoundException
  {
    System.out.println("读出对象！");
    name = (String)in.readObject();
    age = in.readInt();
    salary = in.readDouble();
  }
  
  public String toString()
  {
    return "Name:"+name+"\nAge:"+age+"\nSalary:"+salary;	
  }
}