[Android Studio] 로또 생성하기

MainActivity4.java

package kr.co.aiai.app;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
import java.util.Arrays;


public class MainActivity4 extends AppCompatActivity {
    EditText et1;
    EditText et2;
    EditText et3;
    EditText et4;
    EditText et5;
    EditText et6;
    Button btn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);

        et1 = findViewById(R.id.et1);
        et2 = findViewById(R.id.et2);
        et3 = findViewById(R.id.et3);
        et4 = findViewById(R.id.et4);
        et5 = findViewById(R.id.et5);
        et6 = findViewById(R.id.et6);
        btn = findViewById(R.id.btn);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                makeLotto();
            }
        });
    }

    public void makeLotto(){

        int[] lotto = new int[45];
        for(int i = 1; i<=lotto.length; i++){
            lotto[i-1] = i;
        }

        for(int i = 0; i<=100; i++){
          int rnd = (int)(Math.random()*45);
            int temp = lotto[0];
            lotto[0] = lotto[rnd];
            lotto[rnd] = temp;
        }
        Arrays.sort(lotto,0,6);
        et1.setText(lotto[0]+"");
        et2.setText(lotto[1]+"");
        et3.setText(lotto[2]+"");
        et4.setText(lotto[3]+"");
        et5.setText(lotto[4]+"");
        et6.setText(lotto[5]+"");



    }




}

 

activity_main4.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        tools:ignore="MissingConstraints">


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <EditText
                android:id="@+id/et1"
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:inputType="number"
                android:text="__" />

            <EditText
                android:id="@+id/et2"
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:inputType="number"
                android:text="__" />

            <EditText
                android:id="@+id/et3"
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:inputType="number"
                android:text="__" />

            <EditText
                android:id="@+id/et4"
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:inputType="number"
                android:text="__" />

            <EditText
                android:id="@+id/et5"
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:inputType="number"
                android:text="__" />

            <EditText
                android:id="@+id/et6"
                android:layout_width="50dp"
                android:layout_height="wrap_content"
                android:inputType="number"
                android:text="__" />

        </LinearLayout>

        <Button
            android:id="@+id/btn"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="로또생성하기" />
    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>