MainActivity.java snackbar

package com.example.saigopinarimeti.helloworld;

import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {

    Button button;

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

        coordinatorLayout = findViewById(R.id.layout);
        button = findViewById(R.id.showSnack);

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Snackbar.make(coordinatorLayout,"This Message Deleted",Snackbar.LENGTH_SHORT)
                        .setAction("Undo", new View.OnClickListener() {
                            @Override
                            public void onClick(View v) {
                                Toast.makeText(MainActivity.this, "Message undo success", Toast.LENGTH_SHORT).show();
                            }
                        }).show();

            }
        });

    }

}