A.java

package com.aj.snippet.javamodule.a;
// default access modifier
class A {
}

B.java

package com.aj.snippet.javamodule.a;

public class B {   
}

Z.java

package com.aj.snippet.javamodule.b;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

import com.aj.snippet.javamodule.a.A; 
//This is not allowed as A has default access modifier and can be accessed within package

import com.aj.snippet.javamodule.a.B;
//This is allowed as B has public access modifier

public class Z {
    void testMethod() {
        try {
            Class x = Class.forName("com.aj.snippet.javamodule.a.A");
            // But we can access the class A using reflection
            Field[] fields = x.getFields();
            Method[] methods = x.getMethods();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }    
}

Demonstrating the issue with the non-modular approach of Java packaging.