안드로이드 스튜디오 로또생성

package kr.co.aiai.app;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity5 extends AppCompatActivity {

    TextView tv1,tv2,tv3,tv4,tv5,tv6 ;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main5);

        tv1 = findViewById(R.id.tv1);
        tv2 = findViewById(R.id.tv2);
        tv3 = findViewById(R.id.tv3);
        tv4 = findViewById(R.id.tv4);
        tv5 = findViewById(R.id.tv5);
        tv6 =  findViewById(R.id.tv6);

        Button btn =  findViewById(R.id.btn);
        btn.setOnClickListener(view -> {
            myclick();
        });
    }

    public void myclick(){
        int[] arr = {
            1,2,3,4,5,      6,7,8,9,10,
            11,12,13,14,15, 16,17,18,19,20,
            21,22,23,24,25, 26,27,28,29,30,
            31,32,33,34,35, 36,37,38,39,40,
            41,42,43,44,45
        };

        for(int i=0;i<1000;i++){
            int rnd = (int)(Math.random()*arr.length);
            int a = arr[rnd];
            int b = arr[0];
            arr[0]=a;
            arr[rnd]=b;
        }
        Log.d("taekwon",arr[0]+"");
        Log.d("taekwon",arr[1]+"");
        Log.d("taekwon",arr[2]+"");
        Log.d("taekwon",arr[3]+"");
        Log.d("taekwon",arr[4]+"");
        Log.d("taekwon",arr[5]+"");

        tv1.setText(arr[0]+"");
        tv2.setText(arr[1]+"");
        tv3.setText(arr[2]+"");
        tv4.setText(arr[3]+"");
        tv5.setText(arr[4]+"");
        tv6.setText(arr[5]+"");


    }

}