Design mode (Command mode)

The command line encapsulates the request and operation, and frankly, I'm not particularly aware of it, and I'm not using it in a specific project, and I feel a bit too complicated.

This article refers to some of the materials and gives a simple example. As follows:

• Trade

 Public class Trade {    publicvoid  Dosell () {        System.out.println ("Dosell");    }         publicvoid  dobuy () {        System.out.println ("Dobuy");}    }

• Tradecommand

 Public Abstract class Tradecommand {    protected Trade trade ;          Public Tradecommand (Trade trade) {        the. Trade = Trade ;    }          Public Abstract void execute ();}

• Buytradecommand

 Public class extends Tradecommand {    public  Buytradecommand [trade trade] {        Super(trade);    @Override    publicvoid  , execute () {        this. Trade.dobuy ();    }}

• Selltradecommand

 Public class extends Tradecommand {    public  Selltradecommand [trade trade] {        Super(trade) ;    }    @Override    publicvoid  execute () {        this. Trade.dosell ();    }}

• Invoke

 Public class Invoke {    public  tradecommand command;          Public void setcommand (Tradecommand command) {        this. Command = command;    }           Public void Execute () {        command.execute ();    }}

• APP Test class

 Public class App {    publicstaticvoid  main (string[] args) {        new Trade ();         New Invoke ();        Invoke.setcommand (new  Selltradecommand (trade));        Invoke.execute ();        Invoke.setcommand (new  Buytradecommand (trade));        Invoke.execute ();    }}

Design mode (Command mode)