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/lang/StringIndexOutOfBoundsException.java

/*
 * @(#)StringIndexOutOfBoundsException.java	1.15 01/12/10
 *
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package java.lang;

/**
 * Thrown by the <code>charAt</code> method in class 
 * <code>String</code> and by other <code>String</code> 
 * methods to indicate that an index is either negative or greater 
 * than or equal to the size of the string. 
 *
 * @author  unascribed
 * @version 1.15, 12/10/01
 * @see     java.lang.String#charAt(int)
 * @since   JDK1.0
 */
public
class StringIndexOutOfBoundsException extends IndexOutOfBoundsException {
    /**
     * Constructs a <code>StringIndexOutOfBoundsException</code> with no 
     * detail message. 
     *
     * @since   JDK1.0.
     */
    public StringIndexOutOfBoundsException() {
	super();
    }

    /**
     * Constructs a <code>StringIndexOutOfBoundsException</code> with 
     * the specified detail message. 
     *
     * @param   s   the detail message.
     * @since   JDK1.0
     */
    public StringIndexOutOfBoundsException(String s) {
	super(s);
    }

    /**
     * Constructs a new <code>StringIndexOutOfBoundsException</code> 
     * class with an argument indicating the illegal index. 
     *
     * @param   index   the illegal index.
     * @since   JDK1.0
     */
    public StringIndexOutOfBoundsException(int index) {
	super("String index out of range: " + index);
    }
}

⏎ java/lang/StringIndexOutOfBoundsException.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)