Design mode-Command mode

Command mode

A method to complete a function , Most of the steps to complete this function have been determined , But there are a few steps cannot be determined , You must wait until the execution method to determine

The first step is to create the interface

Package Study.command;

/**

* Interface of the command class

* @author Rocky

*

*/

public interface Command

{

/**

* methods that can be used for multiple implementation classes

* @param array

*/

void process (int[] array);

}

The second step implements the interface and implements the method

Import Study.command.Command;

/**

* Implementation of command class, with printing function

* @author Rocky

*

*/

public class Printcommand implements Command

{

@Override

public void process (int[] array)

{

for (int i:array)

{

System.out.println (i);

}

}

}

Package Study.commandimpl;

Import Study.command.Command;

/**

* Interface for summing functions

* @author Rocky

*

*/

public class Sumcommand implements Command

{

@Override

public void process (int[] array)

{

int sum = 0;

for (int i:array)

{

sum + = i;

}

SYSTEM.OUT.PRINTLN (sum);

}

}

Step three, using command mode

Package study.commandtest;

Import Study.command.Command;

Import Study.commandImpl.PrintCommand;

Import Study.commandImpl.SumCommand;

/**

* Class to test the command pattern

* @author Rocky

*

*/

public class Tstcommand

{

/**

*

* @param array of arrays tested

* @param the implementation class of the command class, passing in the corresponding implementation class as required

*/

public void test (int[] array, command command)

{

Command.process (array);

}

public static void Main (string[] args)

{

Command Printcommand = new Printcommand ();

Command Sumcommand = new Sumcommand ();

int[] array = new int[]{1,1,1,1};

New Tstcommand (). Test (array, printcommand);

New Tstcommand (). Test (array, sumcommand);

}

}

Design mode-Command mode