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.

⏎ sun/net/ResourceManager.java

/*
 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package sun.net;

import java.net.SocketException;
import java.util.concurrent.atomic.AtomicInteger;
import sun.security.action.GetPropertyAction;

/**
 * Manages count of total number of UDP sockets and ensures
 * that exception is thrown if we try to create more than the
 * configured limit.
 *
 * This functionality could be put in NetHooks some time in future.
 */

public class ResourceManager {

    /* default maximum number of udp sockets per VM
     * when a security manager is enabled.
     * The default is 25 which is high enough to be useful
     * but low enough to be well below the maximum number
     * of port numbers actually available on all OSes
     * when multiplied by the maximum feasible number of VM processes
     * that could practically be spawned.
     */

    private static final int DEFAULT_MAX_SOCKETS = 25;
    private static final int maxSockets;
    private static final AtomicInteger numSockets;

    static {
        String prop = GetPropertyAction
                .privilegedGetProperty("sun.net.maxDatagramSockets");
        int defmax = DEFAULT_MAX_SOCKETS;
        try {
            if (prop != null) {
                defmax = Integer.parseInt(prop);
            }
        } catch (NumberFormatException e) {}
        maxSockets = defmax;
        numSockets = new AtomicInteger(0);
    }

    public static void beforeUdpCreate() throws SocketException {
        if (System.getSecurityManager() != null) {
            if (numSockets.incrementAndGet() > maxSockets) {
                numSockets.decrementAndGet();
                throw new SocketException("maximum number of DatagramSockets reached");
            }
        }
    }

    public static void afterUdpClose() {
        if (System.getSecurityManager() != null) {
            numSockets.decrementAndGet();
        }
    }
}

⏎ sun/net/ResourceManager.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
Download 

⇒ JDK 11 java.compiler.jmod - Compiler Module

⇐ JDK 11 Modules List

⇑ Download and Use JDK 11

⇑⇑ FAQ for JDK (Java Development Kit)