JDK 11 java.base.jmod is the JMOD file for JDK 11 Base module.

JDK 11 Base module compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\java.base.jmod.

JDK 11 Base module compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 Base module source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\java.base.

You can click and view the content of each source code file in the list below.

⏎ java/lang/IllegalStateException.java

/*
 * Copyright (c) 1996, 2003, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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package java.lang;

/**
 * Signals that a method has been invoked at an illegal or
 * inappropriate time.  In other words, the Java environment or
 * Java application is not in an appropriate state for the requested
 * operation.
 *
 * @author  Jonni Kanerva
 * @since   1.1
 */
public
class IllegalStateException extends RuntimeException {
    /**
     * Constructs an IllegalStateException with no detail message.
     * A detail message is a String that describes this particular exception.
     */
    public IllegalStateException() {
        super();
    }

    /**
     * Constructs an IllegalStateException with the specified detail
     * message.  A detail message is a String that describes this particular
     * exception.
     *
     * @param s the String that contains a detailed message
     */
    public IllegalStateException(String s) {
        super(s);
    }

    /**
     * Constructs a new exception with the specified detail message and
     * cause.
     *
     * <p>Note that the detail message associated with <code>cause</code> is
     * <i>not</i> automatically incorporated in this exception's detail
     * message.
     *
     * @param  message the detail message (which is saved for later retrieval
     *         by the {@link Throwable#getMessage()} method).
     * @param  cause the cause (which is saved for later retrieval by the
     *         {@link Throwable#getCause()} method).  (A {@code null} value
     *         is permitted, and indicates that the cause is nonexistent or
     *         unknown.)
     * @since 1.5
     */
    public IllegalStateException(String message, Throwable cause) {
        super(message, cause);
    }

    /**
     * Constructs a new exception with the specified cause and a detail
     * message of {@code (cause==null ? null : cause.toString())} (which
     * typically contains the class and detail message of {@code cause}).
     * This constructor is useful for exceptions that are little more than
     * wrappers for other throwables (for example, {@link
     * java.security.PrivilegedActionException}).
     *
     * @param  cause the cause (which is saved for later retrieval by the
     *         {@link Throwable#getCause()} method).  (A {@code null} value is
     *         permitted, and indicates that the cause is nonexistent or
     *         unknown.)
     * @since  1.5
     */
    public IllegalStateException(Throwable cause) {
        super(cause);
    }

    static final long serialVersionUID = -1848914673093119416L;
}

⏎ java/lang/IllegalStateException.java

Or download all of them as a single archive file:

File name: java.base-11.0.1-src.zip
File size: 8740354 bytes
Release date: 2018-11-04
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