https://openjdk.java.net/ 
public interface jdk.internal.access.JavaNetSocketAccess
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.internal.access.JavaNetSocketAccess
  super_class: java.lang.Object
{
  public abstract java.net.ServerSocket newServerSocket(java.net.SocketImpl);
    descriptor: (Ljava/net/SocketImpl;)Ljava/net/ServerSocket;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
      Name  Flags
      impl  

  public abstract java.net.SocketImpl newSocketImpl(java.lang.Class<? extends java.net.SocketImpl>);
    descriptor: (Ljava/lang/Class;)Ljava/net/SocketImpl;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Ljava/lang/Class<+Ljava/net/SocketImpl;>;)Ljava/net/SocketImpl;
    MethodParameters:
           Name  Flags
      implClass  
}
SourceFile: "JavaNetSocketAccess.java"