State example in java(GoF design pattern) (not responsible for this code)

gistfile1.java

package br.padroes.gof.comportamental.state;  

public class AcceptedState implements State {          

    public void grantPermission(StateContext ctx) {                     

        }          

    public void requestPermission(StateContext ctx){            

        System.out.println("Requesting permission");            

        ctx.setState(ctx.getRequestedState());          

        }           

    public String getStatus() {            

        return "Request Received";          

        }         

} 

gistfile2.java

package br.padroes.gof.comportamental.state;  



public class ClienteState {                  

    public static void main(String[]args) {                    

        StateContext ctx = new StateContext();                    

        ctx.acceptApplication();                    

        ctx.requestPermission();                    

        ctx.grantPermission();                    

        System.out.println(ctx.getStatus());                  

        } 

    } 

gistfile3.java

package br.padroes.gof.comportamental.state;  

public class GrantedState implements State {          

    public void grantPermission(StateContext ctx) {           

        System.out.println("Invalid state");          

        }          

    public void requestPermission(StateContext ctx){           

        System.out.println("Invalid state");          

        }                    

    public String getStatus() {           

        return "Granted";          

        }         

    } 

gistfile4.java

package br.padroes.gof.comportamental.state;  

public class RequestedState implements State {          

    public void grantPermission(StateContext ctx) {            

        System.out.println("Granting Permission");            

        ctx.setState(ctx.getGrantedState());          

        }          

    public void requestPermission(StateContext ctx){           

        System.out.println("Permission already requested");          

        }          

    public String getStatus() {            

        return "Requested permission";          

        }         

    } 

gistfile5.java

package br.padroes.gof.comportamental.state;  

public interface State {          

    public void grantPermission(StateContext ctx);          

    public void requestPermission(StateContext ctx);          

    public String getStatus(); 

    } 

gistfile6.java

 package br.padroes.gof.comportamental.state;  

 public class StateContext {          

     private State acceptedState;          

     private State requestedState;          

     private State grantedState;           

     private State state;           

     public StateContext() {            

         acceptedState = new AcceptedState();            

         requestedState = new RequestedState();            

         grantedState = new GrantedState();            

         state = null;          

         }           

     public void acceptApplication() {            

         this.state = acceptedState;          

         }           

     public void requestPermission() {            

         state.requestPermission(this);          

         }           

     public void grantPermission() {            

         state.grantPermission(this);          

         }           

     public String getStatus() {            

         return state.getStatus();         

         }           

     public void setState(State state) {            

         this.state = state;          

         }           

     public State getAcceptedState() {            

         return acceptedState;          

         }           

     public State getGrantedState() {            

         return grantedState;          

         }           

     public State getRequestedState() {            

         return requestedState;          

         } 

     }