https://openjdk.java.net/ 
public interface java.awt.image.TileObserver
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.awt.image.TileObserver
  super_class: java.lang.Object
{
  public abstract void tileUpdate(java.awt.image.WritableRenderedImage, int, int, boolean);
    descriptor: (Ljava/awt/image/WritableRenderedImage;IIZ)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    MethodParameters:
                Name  Flags
      source          
      tileX           
      tileY           
      willBeWritable  
}
SourceFile: "TileObserver.java"