Make A Java Program That Calls Object Value Initialized

i have this following codes and im trying to make a java program that calls an object value initialized.

public class TestClass
{
public String name;
public int age;
public void myMessage()
{
System.out.println("Hello I'm" + name + "and i'm" + age + "years old");
}
}

what i want is to put the following codes of the object.. so once i compile and run the project it executes the value of an object from the method i defined above.

TestClass myName = new TestClass();
myName.name = "Jefferson";
myName.age = 18;

my question is, it is possible to declare or define it in the same project? or i need to do this separately?