101 lines
2.6 KiB
Java
101 lines
2.6 KiB
Java
// serialization/Worm.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Demonstrates object serialization
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import java.io.*;
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import java.util.*;
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class Data implements Serializable {
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private int n;
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Data(int n) { this.n = n; }
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@Override public String toString() {
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return Integer.toString(n);
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}
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}
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public class Worm implements Serializable {
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private static Random rand = new Random(47);
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private Data[] d = {
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new Data(rand.nextInt(10)),
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new Data(rand.nextInt(10)),
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new Data(rand.nextInt(10))
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};
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private Worm next;
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private char c;
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// Value of i == number of segments
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public Worm(int i, char x) {
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System.out.println("Worm constructor: " + i);
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c = x;
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if(--i > 0)
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next = new Worm(i, (char)(x + 1));
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}
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public Worm() {
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System.out.println("Zero-argument constructor");
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}
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@Override public String toString() {
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StringBuilder result = new StringBuilder(":");
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result.append(c);
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result.append("(");
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for(Data dat : d)
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result.append(dat);
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result.append(")");
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if(next != null)
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result.append(next);
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return result.toString();
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}
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public static void
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main(String[] args) throws ClassNotFoundException,
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IOException {
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Worm w = new Worm(6, 'a');
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System.out.println("w = " + w);
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try(
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ObjectOutputStream out = new ObjectOutputStream(
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new FileOutputStream("worm.dat"))
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) {
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out.writeObject("Worm storage\n");
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out.writeObject(w);
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}
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try(
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ObjectInputStream in = new ObjectInputStream(
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new FileInputStream("worm.dat"))
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) {
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String s = (String)in.readObject();
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Worm w2 = (Worm)in.readObject();
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System.out.println(s + "w2 = " + w2);
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}
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try(
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ByteArrayOutputStream bout =
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new ByteArrayOutputStream();
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ObjectOutputStream out2 =
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new ObjectOutputStream(bout)
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) {
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out2.writeObject("Worm storage\n");
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out2.writeObject(w);
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out2.flush();
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try(
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ObjectInputStream in2 = new ObjectInputStream(
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new ByteArrayInputStream(
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bout.toByteArray()))
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) {
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String s = (String)in2.readObject();
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Worm w3 = (Worm)in2.readObject();
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System.out.println(s + "w3 = " + w3);
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}
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}
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}
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}
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/* Output:
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Worm constructor: 6
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Worm constructor: 5
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Worm constructor: 4
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Worm constructor: 3
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Worm constructor: 2
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Worm constructor: 1
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w = :a(853):b(119):c(802):d(788):e(199):f(881)
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Worm storage
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w2 = :a(853):b(119):c(802):d(788):e(199):f(881)
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Worm storage
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w3 = :a(853):b(119):c(802):d(788):e(199):f(881)
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*/
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