[JAVA] I made a rock-paper-scissors app with android

I added the win / loss count and the winning percentage to the basic rock-paper-scissors. Obviously, the more you do, the closer the winning percentage will be to 33.3%.

スクリーンショット 2018-05-07 14.08.58.png


package to.msn.wings.janken;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import java.util.Random;

public class MainActivity extends AppCompatActivity {

     player(Player text),playerRes (player's hand)
     com(Com text), comRes(Com hand)
result (win / loss result)
winCnt (win rate),loseCnt,drawCnt (number of draws)
totalCnt,winPer (win rate)
     gu, tyoki, pa

    private int totalCnt; //Total number of battles
    private int drawCnt; //Number of draws
    private int loseCnt; //Number of losses
    private int winCnt; //Number of wins

    protected void onCreate(Bundle savedInstanceState) {

    public void btn_onclick(View view){

        //Hand on the player side
        TextView txt = (TextView)findViewById(R.id.playerRes);
        int player_hand = 0;
        //view.Judge the button clicked with getId
        // 0:gu, 1:tyoki, 2:par
        switch (view.getId()){
            case R.id.gu:
                player_hand = 0;
            case R.id.tyoki:
                player_hand = 1;
            case R.id.pa:
                player_hand = 2;

        //hand on the com side
        TextView com = (TextView)findViewById(R.id.comRes);

        //Set hands of com with random
        Random random = new Random();
        int n = random.nextInt(3);
        int com_hand = 0;
        // 0:gu, 1:tyoki, 2:par
        if (n == 0){
            com_hand = n;
        } else if (n == 1){
            com_hand = n;
        } else if (n == 2){
            com_hand = n;

        //Count up the total number of matches
        TextView total = (TextView) findViewById(R.id.totalCnt);
        total.setText("Total number:" + String.valueOf(totalCnt));

        //Rock-paper-scissors win / loss judgment
        TextView result = (TextView) findViewById(R.id.result);
        int judge = (player_hand - com_hand + 3)%3;
        if (judge == 0) {
            //In this case
            TextView draw = (TextView) findViewById(R.id.drawCnt);
            draw.setText("Number of draws:" + String.valueOf(drawCnt));
        } else if (judge == 1) {
            //If you lose
            TextView lose = (TextView) findViewById(R.id.loseCnt);
            lose.setText("Number of losses:" + String.valueOf(loseCnt));
            result.setText("Your defeat");
        } else if (judge == 2){
            //If you win
            TextView win = (TextView) findViewById(R.id.winCnt);
            win.setText("Number of wins:" + String.valueOf(winCnt));
            result.setText("Your win");

        //Win rate calculation
        TextView per = (TextView) findViewById(R.id.winPer);
        double winPer = (double) winCnt / (double) totalCnt * 100; //Explicitly convert to double and calculate
        per.setText("Win rate:" + String.format("%.2f", winPer) + "%"); //format("%.2f", winPer)Truncate after the second decimal point

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