9: Using Tables in Java

Creation QR Code in Java 9: Using Tables

9: Using Tables
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Let s first consider what a table would look like for a simple tic-tac-toe game
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1 Draw a large box on your piece of paper 2 Divide that box into three columns and three rows 3 Place an X or an O in each of the boxes, leaving no boxes empty
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Following these steps will probably get you a piece of paper with a drawing similar to mine
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O X O
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Now, imagine you want to translate this tic-tac-toe game into a web page How would you do that You ve already learned that in HTML, you cannot simply tab over to the next column and type an X as you might in a spreadsheet application You can, however, use a table to lay out the tic-tac-toe game s structure
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Create a Basic Table Structure
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First, decide how large you want your table, or in this case, how large you want your tic-tactoe game Remember, pixels are the units of measure on the screen; inches or centimeters won t get you far in HTML In the beginning, it ll probably be useful for you to write out your measurements on your drawings Don t worry, though Nothing you re doing now is set in stone You ll be able to make changes later as needed
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After planning out the dimensions of the table, it s time to get started working on the table structure in HTML
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Table Structure
<table> </table> <tr> </tr> <th> </th> <td> </td>
You need to know about four basic table tags, as described next:
The table tag is a container for every other tag used to create a table in HTML The opening and closing table tags should be placed at the beginning and end of your table The tr tag stands for table row The opening and closing tr tags surround the cells for that row The th tag stands for table header An optional tag used instead of the td tag, this tag defines a cell containing header information By default, the content in header cells is bolded and centered The td tag stands for table data and holds the actual content for the cell There are opening and closing td tags for each cell in each row
With these tags in mind, you can create both basic and complex table structures according to your needs Say you want to create a basic table structure, such as the following:
Popular Girls Names
Emily Sarah
Popular Boys Names
Jacob Michael
Your code might look like that shown next:
<table> <tr> <th>Popular Girls Names</th> <th>Popular Boys Names</th> </tr> <tr> <td>Emily</td> <td>Jacob</td> </tr> <tr> <td>Sarah</td> <td>Michael</td> </tr> </table>
NOTE
While you re not required to indent your td or th tags, I did so here to help you differentiate between table rows and cells
9: Using Tables
Opening and closing table tags surround the entire section of code This tells the browser that everything inside these tags belongs in the table And there are opening and closing tr tags for each row in the table These surround td or th tags, which, in turn, contain the actual content to be displayed by the browser
NOTE
Some browsers show a border around each cell, by default I discuss more about borders in the section titled Borders
You can include nearly any type of content in a table cell that you might include elsewhere on a web page This content should be typed in between the opening and closing td tags for the appropriate cell All tags used to format that content should also be included between the td tags
Cell Content
Want to include a blank cell with no content Type the code for a nonbreaking space ( ) between the opening and closing td tags, and your cell will appear blank If you have a lot of blank cells, you could add empty-cells: show; to the style declaration for your table tag
If we return to our tic-tac-toe game, the following is the markup for that table
<table> <tr> <td>O</td> <td>X</td> <td>O</td> </tr> <tr> <td>X</td> <td>O</td> <td>X</td> </tr> <tr> <td>X</td> <td>O</td> <td>X</td> </tr> </table>
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