STRATEGY DESIGN PATTERN IN JAVA AND UML

In Strategy pattern, a class behavior or its algorithm can be changed at run time. This type of design pattern comes under behavior pattern. In this we create objects which represent various strategies and a context object whose behavior varies as per its strategy object. The strategy object changes the executing algorithm of the context object.

Strategy Design Pattern for Hospital Management System

Strategy.java

package SMD5;

public interface Strategy {
    public void illness();
 }

Patient.java

package SMD5;

public class Patient {
 
  private Strategy strategy;
  
    public Patient(Strategy strategy){
        this.strategy = strategy;
     }

    public void executeStrategy(){
       strategy.illness();
     }
 
}

Cured.java

package SMD5;

public class Cured implements Strategy{

 public void illness() {
  System.out.println("Im cured and im paying Bill Bill amount: 5000");
  
 }
 
}

NotCured.java

package SMD5;

public class NotCured implements Strategy{

 public void illness() {
  System.out.println("Im not cured and going under diagnose again");
  
 }

}

StrategyMain.java

package SMD5;

public class StrategyMain {

   public static void main(String[] args) {
    
 System.out.println("Im under diagnosed");
 System.out.println("After Diagnose");
 Patient P = new Patient(new Cured());  
 P.executeStrategy();

 System.out.println("After Diagnose");
 Patient P1 = new Patient(new NotCured());  
 P1.executeStrategy();
   
   }
 
}