【悲報】プログラミングの初歩的な質問をどこですればいいかわからない

import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

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

final LayoutInflater inflater = (LayoutInflater)getLayoutInflater();
final ConstraintLayout layout = (ConstraintLayout)findViewById(R.id.testDynamic);
Button button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
layout.removeAllViews();
inflater.inflate(R.layout.dynamic, layout);
}
});

Button button2 = findViewById(R.id.button2);
final TextView textView = findViewById(R.id.textView);
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
textView.setText(“嘘だよ”);
}
});
}
}