是使用 Android Studio  寫的  跟老師教學的不一樣  想問問  紅箭頭處  怎會錯誤!! 感謝

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package com.example.user.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
        private Button bt1;
        private Button bt2;

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



       bt1 =(Button) findViewById(R.id.button1);
       bt1 =(Button) findViewById(R.id.button2);

       bt1.setOnClickListener(new oit(){
    @Override
    public void onClick(View v){
        super.onClick(v);
        Toast.makeText(MainActivity.this,"bt1要執行的邏輯",1).show();
    }

       });
   }
}


class  oit   implements View.OnClickListener{

   @Override
   public void onClick(View v){
       Log.i("tag","父類的onclick事件")
   }
}