61 lines
2.2 KiB
Java
61 lines
2.2 KiB
Java
import java.io.*;
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// classes must implement java.io.Serializable in order to be serializable
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class Entity implements Serializable {
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// it is recommended to hard-code serialVersionUID so changes to class
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// will not invalidate previously serialized objects
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static final long serialVersionUID = 3504465751164822571L;
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String name = "Entity";
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public String toString() { return name; }
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}
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class Person extends Entity implements Serializable {
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static final long serialVersionUID = -9170445713373959735L;
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Person() { name = "Cletus"; }
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}
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public class SerializationTest {
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public static void main(String[] args) {
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Person instance1 = new Person();
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System.out.println(instance1);
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Entity instance2 = new Entity();
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System.out.println(instance2);
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// Serialize
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try {
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ObjectOutput out = new ObjectOutputStream(new FileOutputStream("objects.dat")); // open ObjectOutputStream
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out.writeObject(instance1); // serialize "instance1" and "instance2" to "out"
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out.writeObject(instance2);
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out.close();
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System.out.println("Serialized...");
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} catch (IOException e) {
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System.err.println("Something screwed up while serializing");
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e.printStackTrace();
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System.exit(1);
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}
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// Deserialize
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try {
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ObjectInput in = new ObjectInputStream(new FileInputStream("objects.dat")); // open ObjectInputStream
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Object readObject1 = in.readObject(); // read two objects from "in"
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Object readObject2 = in.readObject(); // you may want to cast them to the appropriate types
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in.close();
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System.out.println("Deserialized...");
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System.out.println(readObject1);
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System.out.println(readObject2);
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} catch (IOException e) {
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System.err.println("Something screwed up while deserializing");
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e.printStackTrace();
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System.exit(1);
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} catch (ClassNotFoundException e) {
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System.err.println("Unknown class for deserialized object");
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e.printStackTrace();
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System.exit(1);
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}
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}
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}
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