How to Create a Menu in Android?

package com.example.createmenu;
 
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
 
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.layout.menu, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
 
        switch (item.getItemId()) {
 
        case R.id.save:
            Toast.makeText(MainActivity.this, "Save Menu Selected",
                    Toast.LENGTH_SHORT).show();
            return true;
 
        case R.id.search:
            Toast.makeText(MainActivity.this, "Search Menu Selected",
                    Toast.LENGTH_SHORT).show();
            return true;
 
        case R.id.share:
            Toast.makeText(MainActivity.this, "Share Menu Selected",
                    Toast.LENGTH_SHORT).show();
            return true;
 
        case R.id.delete:
            Toast.makeText(MainActivity.this, "Delete Menu Selected",
                    Toast.LENGTH_SHORT).show();
            return true;
 
        default:
            return super.onOptionsItemSelected(item);
        }
    }
}