[medium snippets] #medium #designPattern #CommandPattern

CommandA.java

public class CommandA implements Command {
  public CommandA(ReceiverA receiverA) {
    this.receiverA = receiverA;
  }

  @Override
  public void execute() {
    receiverA.doAction();
  }

  @Override
  public void undo() {
    receiverA.undoAction();
  }

  private ReceiverA receiverA;
}