JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes: "C:\fyicenter\jdk-1.1.8\src".

Here is the list of Java classes of the JDK 1.1 source code:

⏎ java/io/NotSerializableException.java

/*
 * @(#)NotSerializableException.java	1.6 01/12/10
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.io;

/** Raised by a class or the serialization runtime when a class
 * may not be serialized. The argument should be the name of the class.
 *
 * @author  unascribed
 * @version 1.6, 12/10/01
 * @since   JDK1.1
 */
public class NotSerializableException extends ObjectStreamException {
    /**
     * @since   JDK1.1
     */
    public NotSerializableException(String classname) {
	super(classname);
    }

    /**
     * @since   JDK1.1
     */
    public NotSerializableException() {
	super();
    }
}

⏎ java/io/NotSerializableException.java

Or download all of them as a single archive file:

File name: jdk-1.1.8-src.zip
File size: 1574187 bytes
Release date: 2018-11-16
Download 

⇒ Backup JDK 1.1 Installation Directory

⇐ JDK 1.1 classes.zip - Java Core Classes

⇑ Download and Review JDK 1.1

⇑⇑ FAQ for JDK (Java Development Kit)