blip3.java

Java与面向对象程序设计实验教学讲义.复数类的实现,复数类的复杂运算,身份证号码的分析,图形界面设计

import java.io.*;
import java.util.*;
public class Blip3 implements Externalizable {
    int i;
    String s; 
    public Blip3() {
        System.out.println("Blip3 Constructor"); 
    }
    public Blip3(String x, int a) {
        System.out.println("Blip3(String x, int a)");
        s = x;
        i = a;
    }
    public String toString() { return s + i; }
    public void writeExternal(ObjectOutput out) throws IOException{
        System.out.println("Blip3.writeExternal");
        // You must do this:
        out.writeObject(s); 
        out.writeInt(i);
    }
    public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
        System.out.println("Blip3.readExternal");
        // You must do this:
        s = (String)in.readObject(); 
        i =in.readInt();
    }
    public static void main(String[] args) throws IOException, ClassNotFoundException {
        System.out.println("Constructing objects:");
        Blip3 b3 = new Blip3("A String ", 47);
        System.out.println(b3);
        ObjectOutputStream o = new ObjectOutputStream(
                                             new FileOutputStream("Blip3.out"));
        System.out.println("Saving object:");
        o.writeObject(b3);
        o.close();
        // Now get it back:
        ObjectInputStream in =  new ObjectInputStream(
                                             new FileInputStream("Blip3.out"));
        System.out.println("Recovering b3:");
        b3 = (Blip3)in.readObject();
        System.out.println(b3);
    }
}