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Blips.java
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85 lines (65 loc) · 2.04 KB
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package io;
import java.io.*;
/**
* RUN:
* javac io/Blips.java && java io.Blips
*
* OUTPUT:
* Creation objects:
* Constructor Blip1()
* Constructor Blip2()
* Serialize objects:
* Blip1.writeExternal()
* Blip2.writeExternal()
* unserialize b1:
* Constructor Blip1()
* Blip1.readExternal()
*/
public class Blips {
public static void main(String[] args) throws IOException, ClassNotFoundException {
System.out.println("Creation objects:");
Blip1 b1 = new Blip1();
Blip2 b2 = new Blip2();
ObjectOutputStream o = new ObjectOutputStream(
new FileOutputStream("Blips.out")
);
System.out.println("Serialize objects:");
o.writeObject(b1);
o.writeObject(b2);
o.close();
ObjectInputStream in = new ObjectInputStream(
new FileInputStream("Blips.out")
);
System.out.println("unserialize b1:");
b1 = (Blip1)in.readObject();
//
// ERROR:
//
// java.io.InvalidClassException: io.Blip2; no valid constructor
//
// System.out.println("unserialize b2:");
// b2 = (Blip2)in.readObject();
}
}
class Blip1 implements Externalizable {
public Blip1() {
System.out.println("Constructor Blip1()");
}
public void writeExternal(ObjectOutput out) throws IOException {
System.out.println("Blip1.writeExternal()");
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
System.out.println("Blip1.readExternal()");
}
}
class Blip2 implements Externalizable {
Blip2() {
System.out.println("Constructor Blip2()");
}
public void writeExternal(ObjectOutput out) throws IOException {
System.out.println("Blip2.writeExternal()");
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
System.out.println("Blip2.readExternal()");
}
}