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} class Window extends JFrame implements ItemListener { JTextArea ta = new JTextArea(2, 25); JComboBox combo1 = new JComboBox(); public Window () { super ("Hello world!"); setSize(400,200); setDefaultCloseOperation(JFrameEXIT_ON_CLOSE); setVisible(true); Container ca = getContentPane(); casetBackground(ColorlightGray); FlowLayout flm = new FlowLayout(); casetLayout(flm); combo1addItemListener(this); combo1addItem("Test 1"); combo1addItem("Test 2"); caadd(combo1); caadd(ta); setContentPane(ca); } public void itemStateChanged(ItemEvent event) { String pick = eventgetItem()toString(); tasetText(pick); } }
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Each time text in the combo box changes, the event triggers the program to copy the text into the text area
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CHAPTER 12 Graphical User Interface
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You ve probably noticed when using a GUI application that some GUI elements are grayed out and inaccessible to you Programmers call these disabled GUI elements GUI elements are disabled whenever they shouldn t be used or do not apply to the current process For example, you ll recall in a previous section that we used a push button to copy text from one text area to another text area We could disable the push button until the user enters text into the first text area because we cannot copy something that isn t there Once text is entered into the first text area, we would then enable the push button You can enable and disable a GUI element by calling the setEnabled() method and passing it a Boolean true to enable the element or a Boolean false to disable the element Here s a statement that enables button 1 (bt1 is a reference to a button):
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bt1setEnabled(true);
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1 What is the purpose of an event listener 2 What is an event handler 3 Can you display GUI elements in a window 4 What is the purpose of a content pane 5 Why would you want to disable a GUI element 6 Can a window be created but not shown 7 How do you place a content pane in a container 8 What is the purpose of a layout manager 9 Can you explicitly specify the location of a GUI element in a window 10 What is a major difference between creating a GUI in Java as opposed to creating a GUI in another programming language such as C++
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CHAPTER
JDBC and Java Data Objects
Whenever you go through the checkout counter at your local supermarket, information about your purchase is stored in a computer database When you use your credit card, the date, time, place, and information about your purchase is recorded in the credit card company s database Your school records and medical records are stored in a database In fact, there is practically nothing you do that isn t stored in some database Information is collected, stored, updated, retrieved, and deleted by a computer program In this chapter, you ll learn how to create a Java program that performs these interactions with a database
Database 101
Let s take a moment to review basic database concepts before you learn how to write your own program that talks to a database Skip this section if you are familiar with
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Java Demystified
databases; otherwise, read on because you ll need this information to understand the rest of the material in this chapter Think of a database as an Excel workbook An excel workbook consists of several spreadsheets called tables, each identified by a tab You display a table by selecting the tab A table consists of columns and rows Typically, each column has similar information, such as the first names of all the students in your class A row usually consists of one set of relation information You might find a student s first name, last name, student ID, and other pertinent information about a particular student in a row of the table A database is nearly the same organization of information as an Excel workbook A database is a collection of tables A table is a collection of rows A row is a collection of columns Data is stored where a row and column intersect You know this as a cell in Excel Database management software (DBMS) is a type of application that enables you to organize data into a database It also manages the data for you You simply tell the DBMS to do something, and it does it For example, you might say, Store this student registration in the database, and information about the registration is placed in the proper rows and tables in the database Likewise, you might say, Show me all courses Bob Smith is taking this term, and the DBMS searches the database and gives you a copy of the information that you requested Many commercially available DBMS products are on the market These include familiar names such as Microsoft Access, IBM s DB2, Oracle, Sybase, and MySQL, to mention a few All these products organize and manage data for you and are capable of following your instructions Those instructions, called queries, are written using Structured Query Language (SQL) SQL is beyond the scope of this book; however, later in this chapter, you ll learn how to incorporate SQL queries into your program and have your program send those queries to the DBMS for processing There is a lot more to learn about databases, but I ll leave you to explore that in another book For now, we ll turn our attention to learning how your program connects to a DBMS, sends a query, and retrieves the data returned by the DBMS
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