Code Slot machine in Java

Its been a busy week so far. I went out with a few few friends for some fun this weekend. Found a slot machine and thought of doing it in Java.

So here I present to you a simple Slot Machine in Java 8.

package Casino;

import java.lang.Override;
import java.lang.String;
import java.util.*;
import java.lang.Math;

public class SlotMachine {
    public static Scanner input;


    public static final String BAR = "BAR";
    public static final String CHERRIES = "CHERRIES";
    public static final String SPACE = "SPACE";
    public static final String SEVEN = "7";


    // main method
    public static void main(String[] args) {
        input = new Scanner(System.in);

        // getting user bet
        int bettingAmount;

        do {

            bettingAmount = getBet();

            // validating input bet
            if (bettingAmount < 0 || bettingAmount > 100)
                continue;
            if (bettingAmount == 0)
                break;


            // player pulls the slot machine
            TripleString tripleString = pull();


            // get multiplier from the slot pull
            int multiplier = getPayMultiplier(tripleString);


            // getting winnings (or nothing)
            int winnings = bettingAmount * multiplier;


            // showing winnings (or nothing)
            display(tripleString, winnings);
        } while (bettingAmount != 0);
        input.close();
    }

    // get bet method
    public static int getBet() {
        int inputBet;
        String instructions = "How much would you like to bet (1 - 100) or 0 to quit?";
        System.out.println(instructions);
        inputBet = input.nextInt();

        return inputBet;
    }


    public static String randString() {
        double randomValue;
        randomValue = Math.random() * 100;
        int randomIntValue;
        randomIntValue = (int) randomValue;


        // all even numbers between 1 and 100 will return bar (50%)
        if (randomIntValue % 2 == 0)
            return Bar;


        // all odd numbers between 1 and 50 will return cherries (25%)
        if (randomIntValue >= 1 && randomIntValue < 50)
            return Cherries;


        // all odd numbers between 51 and 75 will return space (12.5%)
        if (randomIntValue >= 51 && randomIntValue < 74)
            return Space;


        // all odd numbers between 76 and 100 will return 7 (12.5%)
        if (randomIntValue >= 75 && randomIntValue < 100)
            return Seven;
        return "";
    }


    // pull method
    public static TripleString pull() {

        // creating object from default constructor
        TripleString thePull = new TripleString();

        // using mutators to change string values
        thePull.setString1(randString());
        thePull.setString2(randString());
        thePull.setString3(randString());

        // returning triple string
        return thePull;
    }


    // returning amount won (0, 5, 15, 30, 50 or 100).
    public static int getPayMultiplier(TripleString thePull) {
        if (thePull.getString1() == Cherries)
            if (thePull.getString2() == Cherries)
                if (thePull.getString3() == Cherries)
                    return 30;
                else
                    return 15;
            else
                return 5;
        if (thePull.getString1() == Bar && thePull.getString2() == Bar
                && thePull.getString3() == Bar)
            return 50;
        if (thePull.getString1() == Seven && thePull.getString2() ==
                Seven && thePull.getString3() == Seven)
            return 100;

        return 0;
    }


    // displaying if user won or lost
    public static void display(TripleString thePull, int winnings) {
        System.out.println("Whirrrr.......and your pull is");
        System.out.println(thePull);
        if (winnings > 0)
            System.out.println("Congratulations, you win: " + winnings);
        else
            System.out.println("Sorry, you lose. Better luck next time.");
    }

}

class TripleString {

    public static final String BAR = "BAR";
    public static final String CHERRIES = "CHERRIES";
    public static final String SPACE = "SPACE";
    public static final String SEVEN = "7";

    // member data
    private String string1 = "", string2 = "", string3 = "";

    // static constant
    public static final int MAX_LEN = 20;

    // private helper method
    private boolean validString(String str) {
        if (str != null && str.length() <= MAX_LEN)
            return true;
        else
            return false;
    }

    // accessor method for string 1
    public String getString1() {
        return string1;
    }


    // accessor method for string 2
    public String getString2() {
        return string2;
    }


    // accessor method for string 3
    public String getString3() {
        return string3;
    }

    // mutator method for string 1
    public boolean setString1(String string1) {
        if (validString(string1)) {
            this.string1 = string1;
            return true;
        } else
            return false;
    }


    // mutator method for string 2
    public boolean setString2(String string2) {
        if (validString(string2)) {
            this.string2 = string2;
            return true;
        } else
            return false;
    }


    // mutator method for string 3
    public boolean setString3(String string3) {
        if (validString(string3)) {
            this.string3 = string3;
            return true;
        } else
            return false;
    }

    @Override
    public String toString() {
 
        return "  " + ((string1.contains(Space)) ? "(" + string1 + ")" : string1) + "  " + ((string2.contains(Space)) ? "(" + string2 + ")" : string2) + 
"  " + ((string3.contains(Space)) ? "(" + string3 + ")" : string3);
    }
}