What is polymorphism?
What will be an ideal response?
A polymorphic reference is a single type of reference that can point to different types of objects at different
times. Polymorphism refers to the fact that the method calls on polymorphic references are selected by the object type, not the
reference type. This is often referred to as late binding.
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Password GUI) In this exercise, you apply the GUI design guidelines you have learned to a graphical user interface for a password-protected message application (Fig. 3.22). You will set the bounds of the Enter your secret message: JTextArea such that it is left aligned with the Enter your secret message: JLabel and right aligned with the Log In JButton.
a) Copying the template to your working directory. Copy the C:ExamplesTutorial03ExercisesPassword directory to your C:SimplyJava directory.
b) Opening the Command Prompt window and changing directories. Open the Command Prompt by selecting Start > Programs > Accessories > Command Prompt. Change to your working directory by typing cd C:SimplyJavaPassword, then pressing Enter.
c) Compiling the template application. Compile your application by typing javac Password.java, then pressing Enter.
d) Running the template application. Run the application by typing java Password.
The GUI of the Password template application should appear as shown in Fig. 3.23. Notice the differences from Fig. 3.22.
e) Closing the application. Close your running application by clicking its close button. f) Opening the template file. Open the Password.java file in your text editor.
g) Customizing the Enter your secret message: JTextArea. Using Fig. 3.22 and the template code as a guide, you wi
Formatting marks never print
Indicate whether the statement is true or false
Answer the following statements true (T) or false (F)
1) The Opengl component provides default bindings for a two-button mouse. 2) Method glutWireCube takes the vertices of its corners as arguments. 3) CD method get_song_length returns the length of a song on a CD. 4) A destroy method acts as a destructor for Tkinter programs. 5) Games are the most common applications developed with pygame.
A constant is a value that remains the same in an expression
Indicate whether the statement is true or false