Error using Reflection "Class.forName" in Eclipse

I am trying to compile a reflection example with the help of a sample taken from book in Eclipse IDE:

public class Reflection_Test {

    public static void main(String[] args) {

        // In both cases below, "ClassNotFoundException" occurs
        Class c1 = Class.forName("java.util.Date");
        Class c2 = Class.forName("Foo");
    }

}

class Foo {
    // ...
}

I copied the line exactly but this is raising two exceptions. I googled other questions and they suggested to use a correct package name. But in my case I am compiling it under default package. What is it missing?