Hogwarts School Of Computer Science
From Huben's Wiki
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| + | [[Image:Welcome To Hogwarts.jpg]] | ||
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''GLENDOWER: I can call spirits from the vasty deep.<br> | ''GLENDOWER: I can call spirits from the vasty deep.<br> | ||
''HOTSPUR: Why, so can I, or so can any man; But will they come when you do call for them?''<br> | ''HOTSPUR: Why, so can I, or so can any man; But will they come when you do call for them?''<br> | ||
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// Adjust the horizontal position of the banner: | // Adjust the horizontal position of the banner: | ||
| − | xPos- | + | xPos = xPos - 1; |
if (xPos < -100) | if (xPos < -100) | ||
{ | { | ||
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* Cut and paste the incantation Banner.java into Dr. Java. | * Cut and paste the incantation Banner.java into Dr. Java. | ||
* Use the file menu to save it to your H drive. Don't change the name from Banner. Dr. Java automatically knows what to call the file: you just tell it what folder. | * Use the file menu to save it to your H drive. Don't change the name from Banner. Dr. Java automatically knows what to call the file: you just tell it what folder. | ||
| − | * Use the Edit/Preferences menu to check the "Show All Line Numbers" box. Go "oooo, ahhhhhhh!" | + | * Use the Edit/Preferences menu to check the "Show All Line Numbers" box. Click apply, and close the preferences box. Go "oooo, ahhhhhhh!" |
* Click "compile", then click "run". | * Click "compile", then click "run". | ||
* Enjoy the results! | * Enjoy the results! | ||
Now we play with it. | Now we play with it. | ||
| − | * Look for numbers, and try to | + | * Look for numbers, and try to change them to make it run differently. You will need to compile and run to see your changes. |
* What numbers do what? | * What numbers do what? | ||
* Bonus if you can find how to make it hop instead of smooth scrolling. | * Bonus if you can find how to make it hop instead of smooth scrolling. | ||
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This incantation has not followed the rules of the curly braces, but will still work. | This incantation has not followed the rules of the curly braces, but will still work. | ||
| − | * Cut and paste it into Dr. Java, and save it. | + | * Cut and paste it into Dr. Java, and save it as HelloGraphics. |
* Run it: it should work. | * Run it: it should work. | ||
* Now indent it properly so that it looks like Banner.java above. | * Now indent it properly so that it looks like Banner.java above. | ||
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* What does that tell us about spaces in these incantations? | * What does that tell us about spaces in these incantations? | ||
* Why then do we indent according to curly braces? | * Why then do we indent according to curly braces? | ||
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| + | Let's do it the easy way now! | ||
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| + | * Cut and paste it again into Dr. Java, so there is no indentation. | ||
| + | * Select all the code. | ||
| + | * Press the Tab key. What magic has resulted? | ||
| + | * If you have time, you can play with this program too. | ||
