Stone Paper Scissor game in Java

import java.util.Random;
import java.util.Scanner;

public class Game
{
    private static int userWinningCount, computerWinningCount;
    private int userInput, computerInput;
    public void setUserInput(int userInput)
    {
        this.userInput = userInput;
    }
    public void setComputerInput()
    {
        Random r = new Random();
        computerInput = r.nextInt(3-1+1)+1;// corresponding to r.nextInt(max-min+1)+min;
    }
    public String computerChoice()
    {
        if(computerInput == 1)
            return "Stone";
        else if(computerInput == 2)
            return "Paper";
        else
            return "Scissor";
    }
    public String getResult()
    {
        if(userInput == computerInput)
            return "Tie ";
        else if(userInput == 1 && computerInput == 2)// stone = 1, paper = 2, scissor = 3;
            return "Computer won";
        else if(userInput == 1 && computerInput == 3)
            return "You won";
        else if(userInput == 2 && computerInput == 1)
            return "You won";
        else if(userInput == 2 && computerInput == 3)
            return "Computer won";
        else if(userInput == 3 && computerInput == 1)
            return "Computer won";
        return "You won";// i.e. user has scissor and computer has paper.
    }
    public static void main(String []args)
    {
        String s = "yes";
        Game obj = new Game();
        Scanner input = new Scanner(System.in);
        while(s.equalsIgnoreCase("yes"))
        {
            System.out.println("Ener your choice (Stone, Paper, Scissor)");
            String choice = input.next();
            choice = choice.toLowerCase();
            if(choice.equals("stone"))
                obj.setUserInput(1);
            else if(choice.equals("paper"))
                obj.setUserInput(2);
            else if(choice.equals("scissor"))
                obj.setUserInput(3);
            else
                System.out.println("Enter valid option");
            obj.setComputerInput();
            System.out.println("The computer chose : "+obj.computerChoice());
            if(obj.getResult().equals("You won"))
                userWinningCount++;
            else if(obj.getResult().equals("Computer won"))
                computerWinningCount++;
            System.out.println(obj.getResult());
            System.out.print("Your winning count = "+userWinningCount);
            System.out.print(" and Computer winning count = "+computerWinningCount);
            System.out.println("\n Wanna continue playing game ? (enter yes) ");
            s = input.next();
        }
        input.close();
    }
}

Java program to multiply any number with 7 without using * and + operator

import java.util.Scanner;

public class MultiplyWith7
{
    private Integer num, res;
        //private double res1;// for another solution to this problem
    public void getNum(Integer n)
    {
        num = n;
    }
    public void CalculateResult()
    {
                //res1 = num/((double)1/7);// then print res1
        res = num<<3;
        res = res-num;
    }
    public void showResult()
    {
        System.out.println("The result of "+num+"*7 is : "+res);
    }
    public static void main(String []args)
    {
        MultiplyWith7 obj = new MultiplyWith7();
        Scanner input = new Scanner(System.in);
        System.out.println("Enter the number : ");
        obj.getNum(input.nextInt());
        obj.CalculateResult();
        obj.showResult();
        input.close();
    }
}

hexadecimal to octal conversion program in java

import java.util.Scanner;

public class HexadecimalToOctal 
{
    private String hex;
    private int dec;
    private String oct;
    public void setHex(String hex)
    {
        this.hex = hex;
    }
    public void getDec()
    {
        dec = Integer.parseInt(hex, 16);
    }
    public void setOct()
    {
        oct = Integer.toOctalString(dec);
    }
    public String getOct()
    {
        return oct;
    }
    public static void main(String []args)
    {
        HexadecimalToOctal obj = new HexadecimalToOctal();
        Scanner input = new Scanner(System.in);
        System.out.println("Enter a hexadecimal number : ");
        obj.setHex(input.next());
        obj.getDec();
        obj.setOct();
        System.out.println("The octal equivalent is : "+obj.getOct());
        input.close();
    }
}