Why in android java variable class is not implemented in this case?

i am trying to understand logic behind instance variables scope in this case :

 public class DiceActivity extends AppCompatActivity implements View.OnClickListener {

private TextView textResult;
private int max;

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

    int max = getIntent().getIntExtra("max", 0);
  

    TextView textTitle = (TextView) findViewById(R.id.textTitle);
    textTitle.setText(max+" sided dice");

    textResult = ((TextView) findViewById(R.id.textResult));
    textResult.setText("");
    Button buttonRoll = (Button) findViewById(R.id.buttonRoll);
    buttonRoll.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    SecureRandom random = new SecureRandom();
    int result = random.nextInt(max) + 1;
    textResult.setText(String.valueOf(result));
}

}

the instance variable "max" is not linked to "max" in onCreate method (max returns 0 unless i declare max2=max to get correct result) but somehow textResult works well and doesn t need to declare another variable to get the result.

Because you are using int twice!

It should be like this:

max = getIntent().getIntExtra("max", 0);