cant add Action bar, application crashed

[aahamdan]

Hi Expert, I am trying to add action bar to my application, but my application get crashed once added the following code.

    android.app.ActionBar actionbar = this.getActionBar();
    actionbar.setTitle("test")

; I am using android studio, here is the following information about my code, it is simple: .java file

import android.support.v4.app.NotificationCompat;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity\_main);
    android.app.ActionBar actionbar = this.getActionBar();
    actionbar.setTitle("test");



 }

}

skd version

<uses-sdk android:minSdkVersion="11"
    android:targetSdkVersion="22" />

I cant add actionbar. Anyone can help please. Ahmad,