JRE 8 rt.jar is the JAR file for JRE 8 RT (Runtime) libraries. JRE (Java Runtime) 8 is the runtime environment included in JDK 8. JRE 8 rt.jar libraries are divided into 6 packages:

com.* - Internal Oracle and Sun Microsystems libraries
java.* - Standard Java API libraries.
javax.* - Extended Java API libraries.
jdk.* -  JDK supporting libraries.
org.* - Third party libraries.
sun.* - Old libraries developed by Sun Microsystems.

JAR File Information:

Directory of C:\fyicenter\jdk-1.8.0_191\jre\lib
      63,596,151 rt.jar

Here is the list of Java classes of the com.* package in JRE 1.8.0_191 rt.jar. Java source codes are also provided.

⏎ com/sun/corba/se/impl/ior/iiop/CodeSetsComponentImpl.java

/*
 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package com.sun.corba.se.impl.ior.iiop;

import org.omg.CORBA_2_3.portable.InputStream ;
import org.omg.CORBA_2_3.portable.OutputStream ;

import com.sun.corba.se.spi.ior.TaggedComponentBase ;

import com.sun.corba.se.spi.ior.iiop.CodeSetsComponent ;

import org.omg.IOP.TAG_CODE_SETS ;

import com.sun.corba.se.impl.encoding.CodeSetComponentInfo ;
import com.sun.corba.se.impl.encoding.MarshalOutputStream ;
import com.sun.corba.se.impl.encoding.MarshalInputStream ;

/**
 * @author
 */
public class CodeSetsComponentImpl extends TaggedComponentBase
    implements CodeSetsComponent
{
    CodeSetComponentInfo csci ;

    public boolean equals( Object obj )
    {
        if (!(obj instanceof CodeSetsComponentImpl))
            return false ;

        CodeSetsComponentImpl other = (CodeSetsComponentImpl)obj ;

        return csci.equals( other.csci ) ;
    }

    public int hashCode()
    {
        return csci.hashCode() ;
    }

    public String toString()
    {
        return "CodeSetsComponentImpl[csci=" + csci + "]" ;
    }

    public CodeSetsComponentImpl()
    {
        // Uses our default code sets (see CodeSetComponentInfo)
        csci = new CodeSetComponentInfo() ;
    }

    public CodeSetsComponentImpl( InputStream is )
    {
        csci = new CodeSetComponentInfo() ;
        csci.read( (MarshalInputStream)is ) ;
    }

    public CodeSetsComponentImpl(com.sun.corba.se.spi.orb.ORB orb)
    {
        if (orb == null)
            csci = new CodeSetComponentInfo();
        else
            csci = orb.getORBData().getCodeSetComponentInfo();
    }

    public CodeSetComponentInfo getCodeSetComponentInfo()
    {
        return csci ;
    }

    public void writeContents(OutputStream os)
    {
        csci.write( (MarshalOutputStream)os ) ;
    }

    public int getId()
    {
        return TAG_CODE_SETS.value ; // 1 in CORBA 2.3.1 13.6.3
    }
}

⏎ com/sun/corba/se/impl/ior/iiop/CodeSetsComponentImpl.java

Or download all of them as a single archive file:

File name: jre-rt-com-1.8.0_191-src.zip
File size: 8099783 bytes
Release date: 2018-10-28
Download 

⇒ Backup JDK 8 Installation Directory

⇐ JRE 8 rt.jar - org.* Package Source Code

⇑ Download and Use JDK 8

⇑⇑ FAQ for JDK (Java Development Kit)