https://source.android.com/ 
public interface android.accounts.AccountManagerCallback<V>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: android.accounts.AccountManagerCallback
  super_class: java.lang.Object
{
  public abstract void run(android.accounts.AccountManagerFuture<V>);
    descriptor: (Landroid/accounts/AccountManagerFuture;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Signature: (Landroid/accounts/AccountManagerFuture<TV;>;)V
    MethodParameters:
        Name  Flags
      future  
}
Signature: <V:Ljava/lang/Object;>Ljava/lang/Object;
SourceFile: "AccountManagerCallback.java"