Question

Hi, for my Java class I have built a number guessing game. I need to separate my code into two classes and incorporate a try-catch statement. Any help would be appreciated! Here is my code.

import javax.swing.JOptionPane;

import javax.swing.UIManager;

import java.awt.Color;

import java.awt.color.*;

import java.util.Random;

public class game {

public static void main (String [] args) {

UIManager.put("OptionPane.backround", Color.white);

UIManager.put("Pandelbackround", Color.white);

UIManager.put("Button.background", Color.white);

Random nextRandom = new Random();

int randomNum = nextRandom.nextInt(1000);

boolean playerCorrect = false;

String keyboardInput;

int playerGuess = 0;

int numPlayerGuesses = 0;

boolean running = false;

while( !playerCorrect) {

numPlayerGuesses = numPlayerGuesses + 1;

JOptionPane JOptionPane1 = new JOptionPane();

long startTime = System.nanoTime();

keyboardInput = JOptionPane1.showInputDialog("Guess my number between 0 and 1000!");

UIManager.put("OptionPane.background", Color.white);

UIManager.put("Panel.background", Color.white);

playerGuess = Integer.parseInt( keyboardInput);

}

if( playerGuess > randomNum) {

JOptionPane JOptionPane2 = new JOptionPane();

UIManager.put("OptionPane.background", Color.red);

UIManager.put("Panel.background", Color.red);

JOptionPane2.showMessageDialog(null, "You guessed too high, try again!");

}

else if ( playerGuess < randomNum) {

JOptionPane JOptionPane3 = new JOptionPane();

UIManager.put("OptionPane.background", Color.blue);

UIManager.put("Panel.background", Color.blue);

JOptionPane3.showMessageDialog(null, "You guessed too low, try again!");

}

else {

JOptionPane JOptionPane4 = new JOptionPane();

long startTime = 0;

long estimatedTime = System.nanoTime() - startTime;

UIManager.put("OptionPane.background", Color.green);

UIManager.put("Panel.background", Color.green);

JOptionPane.showMessageDialog(null, "Congrats! you guessed THE NUMBER!!! it only took you " + numPlayerGuesses + " tries in " + estimatedTime + " seconds!");

playerCorrect = true;

}

System.exit(0);

}

}

Answer 1

JAVA PROGRAM

GameLogic class

package test.refactor;

//game logic class
public class GameLogic {

  
   public GameLogic(){
   }
  
   //will determine result based on plater guess
   public int play(int playerGuess,int randomNumber){
       int result;
       if(playerGuess < randomNumber){
           result = -1;
       }else if(playerGuess > randomNumber){
           result = 1;
       }else{ //equal
           result = 0;
       }
      
       return result;
   }
  

}

Updated Game class (refactored)

package test.refactor;

import javax.swing.JOptionPane;

import javax.swing.UIManager;

import java.awt.Color;
import java.awt.HeadlessException;
import java.awt.color.*;

import java.util.Random;

public class Game {

   public static void main (String [] args) {
  
       UIManager.put("OptionPane.backround", Color.white);  
       UIManager.put("Pandelbackround", Color.white);  
       UIManager.put("Button.background", Color.white);
      
       Random nextRandom = new Random();
       int randomNum = nextRandom.nextInt(1000);
       boolean playerCorrect = false;
       String keyboardInput;
      
       int playerGuess = 0;
       int numPlayerGuesses = 0;
       boolean running = false;//unused
      
       GameLogic gl = new GameLogic();
      
       long startTime = System.nanoTime();
       String message = null;
      
       while( !playerCorrect) {//loop until player has guessed correctly
               numPlayerGuesses = numPlayerGuesses + 1;
               updateUIManager(1000);
               keyboardInput = JOptionPane.showInputDialog("Guess my number between 0 and 1000!");  
               try{
                   playerGuess = Integer.parseInt( keyboardInput);  
               }catch(NumberFormatException nfe){ //handled exception here. If not proper inpput , it will display error and go to top of loop
                   message = "Invalid input";
                   JOptionPane.showMessageDialog(null, message);
                   continue;
               }
               int result = gl.play(playerGuess, randomNum); //call gameLogic and its play method
               updateUIManager(result); //update color based on game result
               message = getMessage(result, startTime, numPlayerGuesses);//update message based on gameresult
               JOptionPane.showMessageDialog(null, message);// show message
               if(result == 0){
                   playerCorrect = true;//check if player is correct in guessing
               }
       }
      
       System.exit(0);
   }
  
   /**
   * update UI manager based on value
   * @param gameResult
   */
   private static void updateUIManager(int value){
       Color color = null;
       if(value == 1000){
           //at start
           color = Color.white;
       }else if(value > 0){
           color= Color.red;
       }else if(value < 0){
           color = Color.blue;
       }else{ //equals
           color = Color.green;
       }
      
       UIManager.put("OptionPane.background", color);
       UIManager.put("Panel.background", color);
   }
  
   /**
   * generate message based on game result
   * @param gameResult
   * @param startTime
   * @param numOfGuess
   * @return
   */
   private static String getMessage(int gameResult,long startTime,int numOfGuess){
       String message = null;
       if(gameResult > 0){
           message = "You guessed too high, try again!";
       }else if(gameResult < 0){
           message = "You guessed too low, try again!";
       }else{ //equals
           long estimatedTime = System.nanoTime() - startTime;
           message = "Congrats! you guessed THE NUMBER!!! it only took you " + numOfGuess + " tries in " + estimatedTime + " seconds!";
       }
      
       return message;
   }

}

Output

Input Guess my number between 0 and 1000! 555 OK Cancel

Message You guessed too high, try again! OK

Input Guess my number between 0 and 1000! OK Cancel

Message X Younessed too low, try again! OK

Input ? Guess my number between 0 and 1000! abd OK Cancel

Message Invalid input Invalid input OK