https://openjdk.java.net/ 
interface javax.swing.SwingHeavyWeight
  minor version: 0
  major version: 59
  flags: flags: (0x0600) ACC_INTERFACE, ACC_ABSTRACT
  this_class: javax.swing.SwingHeavyWeight
  super_class: java.lang.Object
{
}
SourceFile: "SwingHeavyWeight.java"