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import java.io.*; /** A utility class that provides a single static method for reading keyboard ** input from the command-line window (via System.in). ** ** Each call to the static method KeyboardInput.readLine() returns a ** String representing a line's worth of input (up until the user ** pressed the Enter key). */ public class KeyboardInput { /** Returns a single line typed via the keyboard. */ public static String readLine() throws IOException { // We'll gather up individual characters one by one using a StringBuffer. StringBuffer input = new StringBuffer(); try { // Read the first integer, and cast it into a character. char in = (char) System.in.read(); // Keep going until we detect a newline character (\n), which is // generated when a user presses the Enter key on the keyboard. while (in != '\n') { input.append(in); // Read the next character. in = (char) System.in.read(); } } catch (IOException e) { // We aren't going to do anything special to respond to these. } // Strip off any leading/trailing white space. return input.toString().trim(); } } Here s a simple example of how we might use the KeyboardInput class from within client code: import java.io.*; // A sample main program that prompts the user for command-line keyboard input. public class KeyboardInputExample { public static void main(String args[]) throws IOException { // Note use of print vs. println. System.out.print("Please enter your name: ");

Another convenient trick is to specify default parameters for a view s arguments. This tells the view which value to use for a parameter by default if none is specified. Here s an example: # urls.py from django.conf.urls.defaults import * urlpatterns = patterns('', (r'^blog/$', views.page), (r'^blog/page( P<num>\d+)/$', views.page), ) # views.py def page(request, num="1"): # Output the appropriate page of blog entries, according to num. # ...

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String name = KeyboardInput.readLine(); System.out.println("Hello, " + name + "!"); } } Running this program from the command line would produce the following results (underlining reflects what was typed by the user): C:\> java KeyboardInputExample Please enter your name: Jacquie Hello, Jacquie! C:\> Let s combine our knowledge of prompting for keyboard input with what we learned earlier about converting String input to numeric values to write a simple command line driven calculator: import java.io.*; public class SimpleCalc { public static void main(String args[]) throws IOException { // We'll ask the user to input two numeric values to be // mathematically combined. // These will come in as Strings, however. double first = 0.0; double second = 0.0; for (int i = 1; i <= 2; i++) { System.out.print("Please enter a number: "); String sNumber = KeyboardInput.readLine(); // Let's try to convert the String input into a numeric value. double number = 0.0; try { number = Double.parseDouble(sNumber); } catch (NumberFormatException e) { System.out.println("Invalid number: " + sNumber); System.out.println("Please try again!"); System.exit(0); } // Remember the number; if (i == 1) first = number; else second = number; } System.out.print("Please choose an operation (+, -, *, /): String operation = KeyboardInput.readLine(); ");

Caution Leaving out column names is rather dangerous, because your INSERT statement may become invalid after nondestructive table modifications, such as adding columns. Column names also improve the readability of your SQL statements.

// Let's try to compute an answer. double answer = 0.0; if (operation.equals("+")) answer = first + second; else if (operation.equals("-")) answer = first - second; else if (operation.equals("*")) answer = first * second; else if (operation.equals("/")) answer = first / second; else { System.out.println("Invalid operation: " + operation); System.out.println("Please try again!"); System.exit(0); } System.out.println(first + " " + operation + " " + second + " = " + answer); } } Here are a few observations: We declare two double variables, first and second, to represent the user s two numeric inputs; we use double as the more precise numeric type, as it will also handle int(eger) values just fine. Similarly, we use the Double.parseDouble method in lieu of Integer.parseInt, because the former will tolerate optional decimal points in the input, whereas the latter will not. Let s look at several different outcomes from running the program as java SimpleCalc. Please enter a number: 1 Please enter a number: 1 Please choose an operation (+, -, *, /): 1.0 + 1.0 = 2.0

Here, both URL patterns point to the same view views.page but the first pattern doesn t capture anything from the URL. If the first pattern matches, the page() function will use its default argument for num, "1". If the second pattern matches, page() will use whatever num value was captured by the regular expression. It s common to use this technique in conjunction with configuration options, as explained earlier. This example makes a slight improvement to the example in the Giving a View Configuration Options section by providing a default value for template_name: def my_view(request, template_name='mysite/my_view.html'): var = do_something() return render_to_response(template_name, {'var': var})

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