1. An instance of class java.awt.Panel cannot be added to another instance of the same class.   True   False   2. The System.in and System.out objects are created by default and need not be created explicitly.   True   False   3. The CheckboxGroup class in package java.awt is a subclass of the Component class in the same package.   True   False   4. An instance of the java.io.File class can be used to delete a file.   True   False   5. A value must always be assigned to String object when it is created, and cannot be modified later.   True   False   6. If an instance of the GridLayout class in java.awt package is used as a layout manager for a java.awt.Frame object, then all the components added directly to the Frame object are of the same width and height.   True   False   7. As a part of the standard API, Java provides a class called Directory in the package java.io which enables the listing of the contents of a directory.   True   False