9.4 Exercises
Exercise 9-1. Write a program that takes the name of a Java class as a command-line
argument and uses the Class class to print out all
the superclasses of that class. For example, if invoked with the
argument "java.awt.Applet", the
program prints the following: java.lang.Object
java.awt.Component java.awt.Container
java.awt.Panel.Exercise 9-2. Modify the program you wrote in Exercise 8-1 so that it prints out
all interfaces implemented by a specified class or by any of its
superclasses. Check for the case of classes that implement interfaces
that extend other interfaces. For example, if a class implements
java.awt.LayoutManager2, the
LayoutManager2 interface and
LayoutManager, its superinterface, should be
listed.Exercise 9-3. Define a class named Assignment that is modeled on
the Command class shown in Example 9-2. Instead of invoking a named method, as
Command does, Assignment should
assign a value to a named field of an object. Give your class a
constructor with the following signature:public Assignment(Object target, Field field, Object value)
Also give it an assign( ) method that, when
invoked, assigns the specified value to the specified field of the
specified object. Assignment should implement
ActionListener and define an
actionPerformed( ) method that also performs the
assignment. Write a static parse( ) method for
Assignment that is similar to the parse(
) method of Command. It should parse
strings of the form
fieldname=value
and should be able to parse boolean, numeric, and string values.
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