Applet jar是由浏览器还是由JVM下载的？

sun.applet.AppletPanel

runLoader()

/**
 * Load the applet into memory.
 * Runs in a seperate (and interruptible) thread from the rest of the
 * applet event processing so that it can be gracefully interrupted from
 * things like HotJava.
 */
private void runLoader() {
    if (status != APPLET_DISPOSE) {
        showAppletStatus(\"notdisposed\");
        return;
    }

    dispatchAppletEvent(APPLET_LOADING, null);

    // REMIND -- might be cool to visually indicate loading here --
    // maybe do animation?
    status = APPLET_LOAD;

    // Create a class loader
    loader = getClassLoader(getCodeBase(), getClassLoaderCacheKey());

    // Load the archives if present.
    // REMIND - this probably should be done in a separate thread,
    // or at least the additional archives (epll).

    String code = getCode();

    // setup applet AppContext
    // this must be called before loadJarFiles
    setupAppletAppContext();

    try {
        loadJarFiles(loader); // <-- this is what loads the JAR files
        applet = createApplet(loader);
        ...

java.exe

Mozilla/4.0 ([OS here]) Java/[Java version here]