Java example source code file (SubclassAcrossPackage.java)

This example Java source code file (SubclassAcrossPackage.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

classnotfoundexception, differentpackageserializable, error, expected, externalizablepackagector, externalizableprivatector, externalizableprotectedctor, invalidclassexception, ioexception, objectinputstream, objectoutputstream, samepackageprivateserializable, samepackageprotectedserializable, serializable

The SubclassAcrossPackage.java Java example source code

/*
 * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @bug 4093279
 * REMOVED test, build and run tag since could not get this to work.
 * Test is run via shell script, run.sh.
 */

package Serialize;

import java.io.*;

class PublicSerializable
extends NonSerializable.PublicCtor implements Serializable
{
    int field1 = 5;
};

class ProtectedSerializable
extends NonSerializable.ProtectedCtor implements Serializable
{
    int field1 = 5;
};

class DifferentPackageSerializable
extends NonSerializable.PackageCtor implements Serializable
{
    int field1 = 5;
    DifferentPackageSerializable() {
        super(1);
    }
};

class SamePackageSerializable
extends Serialize.SamePackageCtor implements Serializable
{
    SamePackageSerializable() {
    }
};

class SamePackageProtectedCtor {
    protected SamePackageProtectedCtor() {
    }
};

class SamePackageProtectedSerializable
extends Serialize.SamePackageProtectedCtor implements Serializable
{
    SamePackageProtectedSerializable() {
    }
};


class SamePackagePrivateCtor {
    private SamePackagePrivateCtor() {
    }
    public SamePackagePrivateCtor(int l) {
    }
};

class SamePackagePrivateSerializable
extends Serialize.SamePackagePrivateCtor implements Serializable
{
    SamePackagePrivateSerializable() {
        super(1);
    }
};

class PrivateSerializable
extends NonSerializable.PrivateCtor implements Serializable
{
    int field1 = 5;

    PrivateSerializable() {
        super(1);
    }
};

class ExternalizablePublicCtor implements Externalizable {
    public ExternalizablePublicCtor() {
    }
    public void writeExternal(ObjectOutput out) throws IOException {
    }
    public void readExternal(ObjectInput in)
        throws IOException, ClassNotFoundException
        {
        }
};

class ExternalizableProtectedCtor implements Externalizable {
    protected ExternalizableProtectedCtor() {
    }
    public void writeExternal(ObjectOutput out) throws IOException {
    }
    public void readExternal(ObjectInput in)
        throws IOException, ClassNotFoundException
        {
        }
};

class ExternalizablePackageCtor implements Externalizable {
    ExternalizablePackageCtor() {
    }
    public void writeExternal(ObjectOutput out) throws IOException {
    }
    public void readExternal(ObjectInput in)
        throws IOException, ClassNotFoundException
        {
        }
};

class ExternalizablePrivateCtor implements Externalizable {
    private ExternalizablePrivateCtor() {
    }
    public ExternalizablePrivateCtor(int i) {
    }
    public void writeExternal(ObjectOutput out) throws IOException {
    }
    public void readExternal(ObjectInput in)
        throws IOException, ClassNotFoundException
        {
        }
};


public class SubclassAcrossPackage {
    public static void main(String args[])
        throws IOException, ClassNotFoundException
        {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ObjectOutputStream out =   new ObjectOutputStream(baos);
            out.writeObject(new PublicSerializable());
            out.writeObject(new ProtectedSerializable());
            out.writeObject(new SamePackageSerializable());
            out.writeObject(new SamePackageProtectedSerializable());
            out.writeObject(new DifferentPackageSerializable());

            InputStream is = new ByteArrayInputStream(baos.toByteArray());
            ObjectInputStream in = new ObjectInputStream(is);
            /* (PublicSerializable)*/ in.readObject();
            /* (ProtectedSerializable) */ in.readObject();
            /* (SamePackageSerializable) */ in.readObject();
            /* (SamePackageProtectedSerializable) */ in.readObject();
            try {
            /* (DifferentPackageSerializable) */ in.readObject();
            } catch (InvalidClassException e) {
            }
            in.close();

            baos.reset();
            out = new ObjectOutputStream(baos);
            out.writeObject(new PrivateSerializable());
            in = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
            try {
                /* (PrivateSerializable) */ in.readObject();
                throw new Error("Expected InvalidClassException reading PrivateSerialziable");
            } catch (InvalidClassException e) {
            }
            in.close();

            baos.reset();
            out = new ObjectOutputStream(baos);
            out.writeObject(new SamePackagePrivateSerializable());
            in = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
            try {
                /* (SamePackagePrivateSerializable) */ in.readObject();
                throw new Error("Expected InvalidClassException reading PrivateSerialziable");
            } catch (InvalidClassException e) {
            }
            in.close();

            baos.reset();
            out = new ObjectOutputStream(baos);
            out.writeObject(new ExternalizablePublicCtor());

            in = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
            /* (ExternalizablePublicCtor) */ in.readObject();
            in.close();

            baos.reset();
            out = new ObjectOutputStream(baos);
            out.writeObject(new ExternalizableProtectedCtor());


            in = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
            try {
                /* (ExternalizableProtectedCtor) */ in.readObject();
                throw new Error("Expected InvalidClassException reading ExternalizableProtectedCtor");
            } catch (InvalidClassException e) {
            }
            in.close();

            baos.reset();
            out = new ObjectOutputStream(baos);
            out.writeObject(new ExternalizablePackageCtor());

            in = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
            try {
                /* (ExternalizablePackageCtor) */ in.readObject();
                throw new Error("Expected InvalidClassException reading ExternalizablePackageCtor");
            } catch (InvalidClassException e) {
            }
            in.close();

            baos.reset();
            out = new ObjectOutputStream(baos);
            out.writeObject(new ExternalizablePrivateCtor(2));

            in = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()));
            try {
                /* (ExternalizablePrivateCtor) */ in.readObject();
                throw new Error("Expected InvalidClassException reading ExternalizablePrivateCtor");
            } catch (InvalidClassException e) {
            }
            out.close();
            in.close();
        }
}