Number guessing game

import java.util.Random;
import java.util.Scanner;
public class guessGame {
    public static final String[] diff = {"Easy (1-10)","Medium (1-50)","Hard (1-100)"};//difficulty array
    public static Scanner input = new Scanner(System.in);
    public static Random rGen = new Random();
    public static int rNum = 0;
    public static int guesses = 0;
    public static int diffChoice = 0;
    public static int guessNum = 0;
    public static int choice = 0;
    public static Main mainObj = new Main();

    public guessGame(){
        System.out.println("\tNUMBER GUESSING GAME v1.0");
        System.out.println("Welcome to the Number Guessing game!");
        getDifficulty();
    }

    public static void getDifficulty(){
        guesses = 0;
        System.out.println("Select a difficulty in order to begin!\nType the number of the difficulty you want to play!");
        //print out difficulties
        for(int x=0;x<diff.length;x++){
            System.out.printf("%d. ", x);
            System.out.println(diff[x]);
        }
        //get difficulty as an int
        System.out.print("Difficulty: ");
        diffChoice = input.nextInt();//get the input

        //now that difficulty is picked we need to generate a number
        genNumber(diffChoice);
    }

    public static void genNumber(int diffChoice){
        switch(diffChoice){
        case 0:
            //1-10
            rNum = rGen.nextInt(9) + 1; //generate 0-9, add 1
            gameBody(rNum);
            break;
        case 1:
            //1-50
            rNum = rGen.nextInt(49) + 1;
            gameBody(rNum);
            break;
        case 2:
            //1-100
            rNum = rGen.nextInt(99) + 1;
            gameBody(rNum);
            break;
        default:
            rNum = rGen.nextInt(9) + 1;
            gameBody(rNum);
        }
    }


    public static void gameBody(int rNum){
        //number they have to guess is rNum
        System.out.println("\nA number has been chosen!");
        while(guesses < 5 && guessNum != rNum){
            System.out.printf("Guess(%d): ",guesses);
            guessNum = input.nextInt();
            if(guessNum > rNum){
                guesses+=1;
                System.out.printf("That guess was too high!\nGuesses remaining: %d\n", 5-guesses);
            }else if(guessNum < rNum){
                guesses+=1;
                System.out.printf("That guess was too low!\nGuesses remaining: %d\n", 5-guesses);
            }else if(guessNum == rNum){
                guesses+=1;
                gameOver(guesses);
            }
        }
        gameOver(guesses);
    }

    public static void gameOver(int guesses){
        if(guesses == 5){
            System.out.println("Oh no! You lost!");
            System.out.println("What would you like to do?");
            System.out.println("Type the number of the option you choose.");
            System.out.println("0. Play Again\n1. Choose Another Game\n2. Quit");
            System.out.print("Choice: ");
            choice = input.nextInt();
            if(choice == 0){
                getDifficulty();
            }else if(choice == 1){
                Main.whatGame();
            }else if(choice == 2){
                System.exit(0);
            }
        }else{
            System.out.println("Congrats! You won " + Main.name + " !\nYou beat the game in " + guesses + "/5 guesses!");
            System.out.println("What would you like to do?");
            System.out.println("Type the number of the option you choose.");
            System.out.println("0. Play Again\n1. Choose Another Game\n2. Quit");
            System.out.print("Choice: ");
            choice = input.nextInt();
            if(choice == 0){
                getDifficulty();
            }else if(choice == 1){
                Main.whatGame();
            }else if(choice == 2){
                System.exit(0);
            }
        }
    }
}