Ch 06 - Building Applications With Oracle Jdeveloper 10g

6

Building Applications with Oracle JDeveloper 10g

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Objectives After completing this lesson, you should be able to do the following: • Create new projects, workspaces, and applications • Build Java applications in JDeveloper • Enhance user interface frame design • Debug an application by using JDeveloper debugger • Define classes by using JDeveloper • Describe how JDeveloper can be used to build enterprise applications

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What Is Oracle JDeveloper 10g? • • • •

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Oracle JDeveloper 10g provides an integrated development environment (IDE). Build, compile, and run Java applications by using Oracle JDeveloper. Use wizards to help build source code. View objects from many perspectives: code, structure, layout, and so on.

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Exploring the JDeveloper Environment

Component Palette

System Navigator 6-4

Code Editor Copyright © 2004, Oracle. All rights reserved.

Property Inspector

Examining Workspaces • •

Contain multiple projects Enable you to view currently used objects Workspace Navigator pane

Structure pane

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What Are Projects? • •

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Contain related files Manage project and environment Project settings Manage compiler and debug options Project files

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Creating JDeveloper Items •

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JDeveloper items are invoked by selecting File > New. They are categorized by type: – – – – –

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General Business Tier Client Tier Database Tier Web Tier

Create any JDeveloper element. Copyright © 2004, Oracle. All rights reserved.

Creating an Application Workspace In the General category, select Application Workspace to invoke the Property pane.

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Specifying Project Details

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Selecting Additional Libraries

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Adding a New J2SE

New J2SE definitions include: • Java executable • A classpath • A source path • A doc path 6-12

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Looking at the Directory Structure JDeveloper creates and stores .java and .class files by using the following convention: • \jdev\mywork • Followed by the workspace name • Followed by the project name – \classes\<package name>\ – \src\<package_name>\

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Followed by class and src files

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Exploring the Skeleton Java Application Contains application and frame classes

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Finding Methods and Fields Find methods and fields by using the Structure pane.

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Supporting Code Development with Profiler and Code Coach • • • •

Improve code quality with Code Coach. Evaluate execution stack with Execution Sample profiler. Examine heap memory usage with Memory profiler. Analyze event occurrence and duration with Event profiler for: – JVM events – Business Components for Java events – Custom events

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Customizing JDeveloper Customize the IDE • Look and feel • General environment • Dockable windows • Component Palette • Load preset keymaps Rename classes and packages by using refactoring.

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Using the Help System

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Obtaining Help on a Topic Use [F1] to invoke context-specific Help.

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Oracle JDeveloper 10g Debugger •

Helps find and fix program errors: – Run-time errors – Logic errors

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Allows control of execution Allows examination of variables

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Setting Breakpoints Setting breakpoints: • Manage multiple breakpoints • Manage conditional breakpoints • Define columns displayed in window – Description – Type – Status, and so on

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Control scope of action – Global > Workspace > Project

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Using the Debugger Windows View Debug information: • Classes: Displays list of loaded classes and status • Watch: Evaluates and displays expressions • Monitors: Displays information about active monitors • Threads: Displays the names and statuses of all threads • Smart Data: Analyzes source code near execution point • … and more

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Stepping Through a Program Step through a program by using the buttons on the Debugger toolbar: • Start the debugger. • Resume the program. • Step over a method call. • Step into a method call. • Step out of a method call. • Step to the end of the method. • Pause execution. • Stop the debugger.

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Watching Data and Variables • • •

The Smart Data tab displays analyzed variables and fields. The Data tab displays arguments, local variables, and static fields from the current context. To watch other variables: – Select a variable in the source window and rightclick. – Select Watch... at Cursor from the context menu. – View the variable in the Watch tab. – Right-click a data item to modify it.

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Summary In this lesson, you should have learned how: • JDeveloper builds, debugs, and runs all types of Java applications • JDeveloper can be used to develop: – – – –

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Java applications Java servlets JSPs EJBs

JDeveloper can be used to build enterprise applications

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Practice 6: Overview This practice covers: • Exploring the Oracle JDeveloper 10g IDE • Creating a workspace and project • Including application files from the earlier lesson

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Full Notes Page for Practices

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Full Notes Page for Practices

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Full Notes Page for Practices

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Full Notes Page for Practices

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