https://openjdk.java.net/ 
public interface jdk.internal.access.JavaIOFilePermissionAccess
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.internal.access.JavaIOFilePermissionAccess
  super_class: java.lang.Object
{
  public abstract java.io.FilePermission newPermPlusAltPath(java.io.FilePermission);
    descriptor: (Ljava/io/FilePermission;)Ljava/io/FilePermission;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      input  

  public abstract java.io.FilePermission newPermUsingAltPath(java.io.FilePermission);
    descriptor: (Ljava/io/FilePermission;)Ljava/io/FilePermission;
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
       Name  Flags
      input  
}
SourceFile: "JavaIOFilePermissionAccess.java"