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Here is source code of the Program to Demonstrate Action Bar in Android. The program is successfully compiled and run on a Windows system using Eclipse Ide. The program output is also shown below.
The ActionBar is located right at the top of an activity. It displays the activity title, icon, actions etc which can trigger, additional views and other interactive items. It can also be used for navigation in your application.It is in initialized with the Oncreateoptionsmenu.

MainActivity.java

package com.example.actionbar;
 
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
 
public class MainActivity extends Activity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

Activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
 
</RelativeLayout>

menu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" >
 
    <item
        android:id="@+id/action_refresh"
        android:icon="@drawable/ic_launcher"
        android:orderInCategory="100"
        android:showAsAction="always"
        android:title="Refresh"/>
    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:showAsAction="never"
        android:title="@string/action_settings"/>
 
</menu>

Java Android Program to Demonstrate Action Bar in Android