Package acm.program

This package provides a set of classes that simplify the creation of programs.

See:
          Description

Class Summary
CommandLineProgram This class simulates the functionality of a ConsoleProgram in an environment that lacks a graphics context.
ConsoleProgram This class is a standard subclass of Program that installs a console in the window.
DialogProgram This class is a standard subclass of Program that takes its input from a IODialog object.
GraphicsProgram This class is a standard subclass of Program whose principal window is used for drawing graphics.
Program This class is the superclass for all executable programs in the acm.program package.
ProgramMenuBar This class standardizes the menu bars used in the ACM program package.
 

Package acm.program Description

This package provides a set of classes that simplify the creation of programs. The package includes five abstract classes, each of which uses a particular paradigm for input and output, as follows:

Program   This class is the root of the program hierachy and defines a program in which input and output are performed using the system console, which is redirected to the standard Java I/O streams System.in and System.out.
ConsoleProgram   This class is similar to Program but fills the program frame with an interactive console (as defined in the IOConsole class in the acm.io package).
DialogProgram   This class extends the basic functionality of the Program class so that input operations are performed using the IODialog class in the acm.io package.
CommandLineProgram   This class is similar to ConsoleProgram but uses System.in and System.out instead of an IOConsole. This class is typically used only for Java programs that are invoked from a command line and make no use of Java’s graphical capabilities.

The principal advantages of using the Program class are:

In most environments, the only thing students need to do to create a new program is to define a Program subclass that implements a run method. For example, the following class definition creates a traditional, stream-oriented program that reads in two integers and computes their sum:


     public class Add2 extends ConsoleProgram {
        public void run() {
           println("This program adds two numbers.");
           int n1 = readInt("Enter n1: ");
           int n2 = readInt("Enter n2: ");
           int total = n1 + n2;
           println("The total is " + total + ".");
        }
     }