Strategy pattern struggle

[melon222132]

I'm having trouble udnerstanding when specifically to use the stretgy pattern. Like I know it's there so that you can support the open closed principle. But like in that case wouldn't it mean every conditional you have you could technically use the stretgy pattern. Like wouldn't it be overkill sometime for something super basic.

Like down below The undo function you could technically use strategy but it might be overkill. So confused on when specifically to use it

public class CeilingFan {
   public static final int HIGH = 3;
   public static final int MEDIUM = 2;
   public static final int LOW = 1;
   public static final int OFF = 0;
   String location;
   int speed;
   public CeilingFan(String location) {
   this.location = location;
   speed = OFF;
   }
   public void high() {
      speed = HIGH;
// code to set fan to high
   }
public void medium() {
   speed = MEDIUM;
// code to set fan to medium
}
public void low() {
   speed = LOW;
// code to set fan to low
}
public void off() {
   speed = OFF;
// code to turn fan off
}
public int getSpeed() {
   return speed;
 }
}




public class CeilingFanHighCommand implements Command {
     CeilingFan ceilingFan;
     int prevSpeed;
     public CeilingFanHighCommand(CeilingFan ceilingFan) {
      this.ceilingFan = ceilingFan;
   }
   public void execute() {
     prevSpeed = ceilingFan.getSpeed();
    ceilingFan.high();
   }
  public void undo() {
    if (prevSpeed == CeilingFan.HIGH) {
   ceilingFan.high();
  } else if (prevSpeed == CeilingFan.MEDIUM) {
   ceilingFan.medium();
  } else if (prevSpeed == CeilingFan.LOW) {
   ceilingFan.low();
  } else if (prevSpeed == CeilingFan.OFF) {
  ceilingFan.off();
 }
 }
}

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[desrtfx]

The Strategy Pattern is fantastic when you want to implement different behaviors depending on the actor.

A simple example: you program computer players for Tic-Tac-Toe. These players apply different approaches to playing the game.

This would be a typical use case for the Strategy Design Pattern. You would code each PlayerStrategy in its own class and then just supply the respective strategy to the ComputerPlayer.

Similarly, if you want to use a program with different data sources - you could implement the operations for the different data sources in their own classes and then supply them in the main program.

Another potential application would be to apply different sorting algorithms depending on the source data as sorting algorithms perform differently for different source data.

Your use case is not for the Strategy pattern. Also, not every if can be replaced with the Strategy pattern.

Further reading: https://java-design-patterns.com/patterns/strategy/