Guessing Game Implementation using JSF

 In a typical Java Server Faces application each page connect to a managed bean, that have properties and methods that are associated with the components. This Guessing Game application consists of one managed bean and two views. All views are using same bean.

 The following are requirements for this application.

1. User must enter a number from 0 to 10.
2. Maximum number of attempt is 5.
3. If user guess a correct number with in 5 attempts, the success message is displayed to the user otherwise the failure message is displayed.

 Ok let's create a managed bean for implementing above requirements.

package com.pointerunits;

import java.io.IOException;
import java.util.Random;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@SessionScoped

public class GuessingGame {
 private int randomNumber;
 private int userNumber;
 private int minimum;
 private int maximum;
 private int allowableAttempts;
 private int userAttempts;
 private String message;
 public GuessingGame() {
  this.minimum = 0;
  this.maximum =10;
  this.allowableAttempts = 5; 
  this.initializeGame();
 }
 private void initializeGame() {
  Random randomGR = new Random();
  this.randomNumber = new Integer(randomGR.nextInt(this.maximum));
  System.out.println("Random number : " + this.randomNumber);
  this.userAttempts = 0;
  this.userNumber = 0;
  this.message = "";
 }
 public int getRandomNumber() {
  return randomNumber;
 }
 public void setRandomNumber(int randomNumber) {
  this.randomNumber = randomNumber;
 }
 public int getUserNumber() {
  return userNumber;
 }
 public void setUserNumber(int userNumber) {
  this.userNumber = userNumber;
 }
 public int getMinimum() {
  return minimum;
 }
 public void setMinimum(int minimum) {
  this.minimum = minimum;
 }
 public int getMaximum() {
  return maximum;
 }
 public void setMaximum(int maximum) {
  this.maximum = maximum;
 }
 public int getAllowableAttempts() {
  return allowableAttempts;
 }
 public void setAllowableAttempts(int allowableAttempts) {
  this.allowableAttempts = allowableAttempts;
 }
 public int getUserAttempts() {
  return userAttempts;
 }
 public void setUserAttempts(int userAttempts) {
  this.userAttempts = userAttempts;
 }
 public String getMessage() {
  return message;
 }
 public void setMessage(String message) {
  this.message = message;
 }
 public void playGame() throws IOException {
  this.userAttempts++;
  boolean isRedirect = false;
  if(this.userNumber == this.randomNumber) {
   this.message = "Hey..you got it. Total attempt is " + this.userAttempts ;
   isRedirect = true;
  }
  else if(this.userNumber > this.randomNumber){
   this.message = "Hey I am lesser than your guess";
  }
  else if(this.userNumber < this.randomNumber) {
   this.message = "Hey I am greater than your guess";
  }
  if(this.userAttempts == this.allowableAttempts) {
   this.message = "Hey..you have failed to guess.";
   isRedirect = true;
  }
  if(isRedirect) {
   FacesContext.getCurrentInstance().getExternalContext().redirect("guessingGameResponse.xhtml");
  }
 }
 
 public void resetGame() throws IOException {
  initializeGame();
  FacesContext.getCurrentInstance().getExternalContext().redirect("guessingGame.xhtml");
 }
}

 Here the redirect() method is used for redirecting to result page. Instead of you can use JSF navigation rule for redirection. The following facelet page is used for getting user input.

 


 
  

Hi, I am thinking of a number from #{guessingGame.minimum} to #{guessingGame.maximum}. Can you guess it?

   
   
   
   

   
   

   
 

 The following facelet page is used for displaying result.

 


 
  
  

  

Do you want to play a game once again?

 

 You can download an entire application from GitHub.