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/NotActiveException.java

/*
 * @(#)NotActiveException.java	1.7 01/12/10
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.io;

/**
 * The NotActiveException is thrown when serialization or deserialization
 * is not active.
 *
 * @author  unascribed
 * @version 1.7, 12/10/01
 * @since   JDK1.1
 */
public class NotActiveException extends ObjectStreamException {
    /**
     * Constructor to create a new NotActiveException with the reason given.
     * @since   JDK1.1
     */
    public NotActiveException(String reason) {
	super(reason);
    }

    /**
     * Constructor to create a new NotActiveException with no reason.
     * @since   JDK1.1
     */
    public NotActiveException() {
	super();
    }
}

⏎ java/io/NotActiveException.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
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