I am getting null value of an instance variable from base class

[newcoder1010]

Hello,

Base.java

package JavaTestNG;

import org.testng.annotations.BeforeClass;
import org.testng.annotations.BeforeTest;

public class Base {
    
    public int x;
    
	// Invoked once when I run the xml file
    @BeforeTest
    public void beforeTest() {
        x=9;
    }
    
	// invoked once for every class
    @BeforeClass
    public void beforeClass() {
        System.out.println("beforeClass");
    }

}

Test1.java

import org.testng.annotations.Test;

public class Test1 extends Base{
	
	@Test
	public void test1() {
		System.out.println("test 1");
		System.out.println("x " + x);
	}

}

Test2.java

import org.testng.annotations.Test;

public class Test2 extends Base{
	
	@Test
	public void test2_1() {
		System.out.println("test2_1");
		System.out.println("x " + x);
	}

}

Test3.java

import org.testng.annotations.Test;

public class Test3 extends Base{
	
	@Test
	public void test3_1() {
		System.out.println("test3_1");
		System.out.println("x " + x);
	}

}

XML:

Running the xml file

<!DOCTYPE suite SYSTEM "https://testng.org/testng-1.0.dtd">
<suite name="test">
	<test name="Test1">
		<classes>
			<class name="JavaTestNG.Test1" />
			<class name="JavaTestNG.Test2" />
		</classes>
	</test>

	<test name="Test2">
		<classes>
			<class name="JavaTestNG.Test3" />
		</classes>
	</test>
</suite>

Console

[RemoteTestNG] detected TestNG version 7.4.0
beforeClass
test 1
x 9

beforeClass
test2_1
x 0

beforeClass
test3_1
x 9
 

---

As you can see, I am getting x 0 for the second test. I am not sure why x = 0 for the second test. Instead, I was expecting to have the value of 9. Can you please help?