@Before Suite and @BeforeTest methods are not called if groups are executed in TestNG

Below is my XML file and Demo Class. Precondition() method will run before demo1() method and postCondition() method will run after demo1() method. Same process is for demo2(). But when i run the code, BeforeSuite and BeforeTest Methods are not Called. Why.? How to call them ?

Output :           
Before Method is executing                                                       
DEMO -1   
After Method is executing  
Before Method is executing  
DEMO 2  
After Method is executing

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Suite">
    <test name="Test">
        <groups>
            <run>
                <include name = "Hey"></include>
            </run>
        </groups>
        <classes>
            <class name="practicepackage.Demo"/>
        </classes>
    </test> <!-- Test -->
</suite> <!-- Suite -->  

package practicepackage;

import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.BeforeSuite;
import org.testng.annotations.BeforeTest;
import org.testng.annotations.Test;

public class Demo {

    @BeforeSuite
    public void beforeSuite(){
        System.out.println("Before Suite method is being launched");
    }

    @BeforeTest
    public void beforeTest(){
        System.out.println("Before Test Method is being luanched");
    }

    @BeforeMethod(groups = {"Hey"})
    public void PreCondition(){
        System.out.println("Before Method is executing");
    }

    @Test (groups = {"Hey"})
    public void demo1(){
        System.out.println("DEMO -1 ");
    }

    @Test(groups = {"Hey"})
    public void demo2(){
        System.out.println("DEMO 2");
    }

    @AfterMethod(groups = {"Hey"})
    public void postCondition(){
        System.out.println("After Method is executing");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Suite">
    <test name="Test">
        <groups>
            <run>
                <include name = "Hey"></include>
            </run>
        </groups>
        <classes>
            <class name="practicepackage.Demo"/>
        </classes>
    </test> <!-- Test -->
</suite> <!-- Suite -->