This is a sample that shows how to use "IMethodInterceptor" in TestNG to order your tests. In this example I am ordering the tests based on their method names.

MethodInterceptorDemo.java

package org.rationale.emotions;

import java.util.Collections;
import java.util.Comparator;
import java.util.List;

import org.testng.IMethodInstance;
import org.testng.IMethodInterceptor;
import org.testng.ITestContext;
import org.testng.annotations.Listeners;
import org.testng.annotations.Test;

@Listeners(MethodInterceptorDemo.MyInterceptor.class)
public class MethodInterceptorDemo {
    @Test
    public void A() {
        System.out.println("Hello A");

    }

    @Test
    public void C() {
        System.out.println("Hello C");

    }

    @Test
    public void B() {
        System.out.println("Hello B");

    }

    @Test
    public void Aaa() {
        System.out.println("Hello Aaa");

    }

    
    public static class MyInterceptor implements IMethodInterceptor {

        @Override
        public List<IMethodInstance> intercept(List<IMethodInstance> arg0, ITestContext arg1) {
            Collections.sort(arg0, new MyComparator());
            return arg0;
        }

    }

    public static class MyComparator implements Comparator<IMethodInstance> {

        @Override
        public int compare(IMethodInstance o1, IMethodInstance o2) {
            return o1.getMethod().getMethodName().compareTo(o2.getMethod().getMethodName());
        }

    }

}