1. HANGMAN Project by Lori Kraus 12/3/03

2. WWWWe’ve played the game, now let’s see what goes on behind the scenes…. O \ | / | d b …but first, a few new things

3. Creating an Array  2 ways: type[ ] arrayName = new type[length]; type[ ] arrayName = new type[length]; arrayName[0] = item1; arrayName[0] = item1; arrayName[1] = item2; arrayName[1] = item2; type[ ] arrayName = {item0, item1, …, itemN}; type[ ] arrayName = {item0, item1, …, itemN};  Here’s what I did: private String[ ] wordBank = {"computer", "science", "project", "object", "binary", "application", "applet", "website", "method", "variable"}; private String[ ] wordBank = {"computer", "science", "project", "object", "binary", "application", "applet", "website", "method", "variable"};

4. Generating a Random Number  class Math Random numbers Random numbers Math.random( ) produces a double value betweenMath.random( ) produces a double value between 0 and 1 0 and 1 Max and min Max and min Exponents Exponents Square roots, etc. Square roots, etc.  Here’s what I did: randomNum = randomNum = (int)((Math.random( ) * 1000) % 10); (int)((Math.random( ) * 1000) % 10);

5. Other Useful Methods  int length; String word; char[ ] wordArray;  length = word.length( ); assigns the value of the length of the word to int length assigns the value of the length of the word to int length  wordArray = new char[length]; creates character array wordArray same length as word creates character array wordArray same length as word  word.getChars(0, length, wordArray, 0); puts characters from 0 to length of String word into wordArray, starting at index 0 puts characters from 0 to length of String word into wordArray, starting at index 0

6. System.out.println  Suppose int answer = 5  We know System.out.println(“answer = ” + answer); System.out.println(“answer = ” + answer); will look like: answer = 5 will look like: answer = 5  There are also ways to print things on new lines (/n), at the tabs (/t), etc.  For example: System.out.println(“answer = /n” + answer); System.out.println(“answer = /n” + answer); will look like: answer = will look like: answer = 5

7.  Here’s what I did: System.out.println("\n***You win!***\n"); System.out.println("\n***You win!***\n"); It looks like: It looks like: ***You win!*** ***You win!***  Also, in order to print a backslash ( \ ), you have to type: System.out.println(“\\”); System.out.println(“\\”);

8. Getting Input From the Console  class System System.in is the stream corresponding to the keyboard input System.in is the stream corresponding to the keyboard input  class InputStreamReader Reads bytes and translates them into characters according to a specified character encoding Reads bytes and translates them into characters according to a specified character encoding  class BufferedReader Reads text from a character-input stream, buffering characters so as to provide for more efficient reading Reads text from a character-input stream, buffering characters so as to provide for more efficient reading Method readLine( ) returns a String containing the contents of the particular line Method readLine( ) returns a String containing the contents of the particular line

9. Common Example:  BufferedReader inputGuess = new BufferedReader ( new InputStreamReader (System.in)); System.out.print("\nGuess a letter:"); System.out.print("\nGuess a letter:"); String guess = inputGuess.readLine( ); String guess = inputGuess.readLine( );  This takes whatever letter the user types in and stores it into the String guess

10. Now let’s look at the code!