https://openjdk.java.net/ 
public interface java.lang.Readable
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.lang.Readable
  super_class: java.lang.Object
{
  public abstract int read(java.nio.CharBuffer);
    descriptor: (Ljava/nio/CharBuffer;)I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
    MethodParameters:
      Name  Flags
      cb    
}
SourceFile: "Readable.java"