Untitled

package rockpaperscissors2;



import static java.lang.Math.random;
import java.util.Scanner;



public class RockPaperScissors2 { 
    public static void main(String[] args) {
    Scanner in = new Scanner(System.in);

        
        String[] choices = new String[3];
        choices[0] = "paper";
        choices[1] = "scissors";
        choices[2] = "rock";
        int totalCoins = 0;
        int round = 0;// Round counter
    
        boolean again = false;
        do {
           round++; //Increment the round counter 
            
            // random index (for the computer)
            int rand = (int) (random() * 3);

            System.out.print("Enter your choice (paper/scissors/rock): ");
            String input = in.nextLine();
            System.out.printf("The computer choice is: %s\n", choices[rand]);
            
            //determine the result
            int idx = rand;
            for (int i = 0; i < 3; i++) {
                if(i == rand) continue;
                if(compareStrings(input,choices[i])) idx = i;
            }
            // //generate 2 random number as the coin rewards

            if(rand-idx==-1||rand-idx==2){
                int earnedCoins1= (int) (Math.random() * 10 + 1);
                int earnedCoins2= (int) (Math.random() * 10 + 1);
                int earnedCoins= Math.addExact(earnedCoins1,earnedCoins2);
                totalCoins += earnedCoins;
                System.out.println("The player wins");
            System.out.println (" Congratulation, you have won " +earnedCoins + " coins! "); 
            } else if (rand == idx) 
                    {
System.out.println("Tie");
again = true;
                   
           
} else {
                System.out.println("The Computer wins");
          
                      System.out.println (" Oh no ! Try again.");
                      
                      //Ask if the player wants to play again whenever after losing  
                      System.out.println (" continue playing? (yes/no)");
                     
        
 String choose = in.nextLine();      
    if ("yes".equals(choose)){ 
System.out.println ("Let's play again");
    
  
    
    
    }else { 
        System.out.println("Thanks for playing!");
        System.out.println("Total coins collected is" + totalCoins + "coins");
        System.out.println("Total rounds played: " + round);
        in.close();
        return;
    }
            }
            //Display total coins and rounds after each round
            System.out.println("Total coins collected:" +  totalCoins);
            System.out.println("Total rounds played: " + round);
            
         } while (again);
        System.out.println("Total rounds played: " + round);
    }

   
    public static boolean compareStrings (String a, String b) {
        int sz1 = a.length(), sz2 = b.length();
        if(sz2!=sz1) return false;
        for (int i = 0; i < sz1; i++) {
            if(a.charAt(i)!=b.charAt(i)) return false;
        }
        return true;
    }

}