Suppose that your want to write a Java program, which inputs from a text file called " xxxx. This is a little tricky under Eclipse due to:. Create the input text file called " FileIOTest. For Servlet 2. You can debug a webapp just like standalone application. For example, you can set breakpoints, single-step through the programs, etc. Eclipse Versions The various versions are: Eclipse 1.
How to Install Eclipse for Java Programming (on Windows, Mac OS and Ubuntu)
Eclipse 2. Eclipse 3. Step 1: Download Download Eclipse from https: Step 2: Unzip To install Eclipse, simply unzip the downloaded file into a directory of your choice e. To install Eclipse: Goto http: You will receive a DMG file e. Follow the screen instructions to install Eclipse. To confirm! You need to first install JDK. Nonetheless, you can install any package, and then add more features when needed. To install Eclipse e. Download Eclipse from http: You will receive a tarball e. Lock Eclipse on Launcher Simply start Eclipse.
Launch Eclipse Launch Eclipse by running " eclipse. Choose an appropriate directory for your workspace , i. If the "Welcome" screen shows up, close it by clicking the "cross" button next to the "Welcome" title. Create a new Java Project For each Java application, you need to create a project to keep all the source files, classes and relevant resources. To create a new Java project: The "New Java Project" dialog pops up. In "Project name", enter " FirstProject ".
Check "Use default location". But make sure that your JDK is 1. In "Project Layout", check "Use project folder as root for sources and class files". Push "Next" button. Uncheck "Create module-info. The "New Java Class" dialog pops up. In "Source folder", keep the "FirstProject".
In "Package", delete the content if it is not empty. In "Name", enter " Hello ". Check " public static void main String args ". Don't change the rest.
Push "Finish" button. The source file " Hello. Enter the following codes: It is because Eclipse performs the so-called incremental compilation , i. To run the program, right-click anywhere on the source file " Hello. The output "Hello, world! Nonetheless, Eclipse allows you to keep more than one programs in a project, which is handy for writing toy programs such as your tutorial exercises.
Clicking the "Run" button with a "Play" icon runs the recently-run program based on the previous configuration. Try clicking on the "down-arrow" besides the "Run" button. Correcting Syntax Errors Eclipse performs incremented compilation, as and when a source "line" is entered.
Debugging Programs in Eclipse Able to use a graphics debugger to debug program is crucial in programming. Step 0: Set an Initial Breakpoint A breakpoint suspends program execution for you to examine the internal states e. Step 3: Step 4: Breakpoint, Run-To-Line, Resume and Terminate As mentioned, a breakpoint suspends program execution and let you examine the internal states of the program. Step 5: Maximizing Window Double-Clicking: You can double-click on the "header" of any panel to maximize that particular panel, and double-click again to restore it back.
This feature is particularly useful for writing source code in full panel. Shorthand Templates sysout, for, You need to reconfigure either your language switching hot-key or Eclipse. Intelli-Sense ctrl-space: You can use ctrl-space to activate the "intelli-sense" or content assist. That is, Eclipse will offer you the choices, while you are typing.
Source Formatting ctrl-shift-f: Right-click on the source. Hints for Correcting Syntax Error: If there is a syntax error on a statement, a red mark will show up on the left-margin on that statement. You could click on the "light bulb" to display the error message, and also select from the available hints for correcting that syntax error.
Refactor or Rename alt-shift-r: You can rename a variable, method, class, package or even the project easily in Eclipse. Eclipse can rename all the occurrences of the entity. Line Numbers: You can also configure many editor options, such as the number of spaces for tab. Alternatively, you can right-click on the left-margin, and check "Show Line Numbers".
Error Message Hyperlink: Click on an error message will hyperlink to the corresponding source statement. Changing Font Type and Size: Unicode Support: This sets the default character set used for file encoding, similar to VM's command-line option -Dfile. Mouse Hover-over: In debug mode, you could configure to show the variable's value when the mouse hovers over the variable. Comparing Two Files: Useful Eclipse Shortcut Keys: Don't use Find Ctrl-F , but use the above context-sensitive search.
Format the source code. Organize imports. Package Explorer vs. We usually use "Package Explorer" in programming, but it will not show you all the folders and files under the project. On the other hand, "Navigator" is a file manager that shows the exact file structure of the project similar to Windows Explorer. Spell Check: Also provide a "User defined dictionary" with an initially empty text file.
Eclipse's Log File: Viewing two files in split screen: Simply click and hold on the title of one file and drag it to the lower side of the screen. Push Alt-Shift-A to toggle between block-select mode and normal mode. To view the snippet window: To create a new snippet category: To create a new snippet item: To insert a snippet: Word Wrap Line Wrap: Word-wrap or line-wrap is essential for editing long HTML documents without the horizontal scroll bar. You could install a plug-in called "Word Wrap" from http: Creating "link folder" in project: You do not have to place all the folders under the project base directory, instead, you can use so-called "link folders" to link to folder outside the project base directory.
Running Eclipse in "clean" mode: You can run eclipse in so-called " clean " mode, which wipes all the cached data and re-initialize the cache, by running eclipse from command-line with "-clean" argument i. It is useful if something is not working proper, especially if you install a new copy of Eclipse. Show the Right Margin: Let me know if you have more tips to be included here. You can keep many small programs with main in one Java project instead of create a new project for each toy program.
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If you encounter syntax error in using printf or Scanner which are available from JDK 1. Command-Line Arguments: Resolving Import Ctrl-Shift-o: To ask Eclipse to insert the import statements for classes. You can see this bug report:. To do this, go to the following URL:.
JDK 7 and JRE 7 Installation Guide
If you have multiple JREs installed such as both Java 7 and Java 8 , you can choose which one to use in the Eclipse preferences. For more help configuring Eclipse, see the other Resources. Install Java Java is in process of transitioning from Java 7 to Java 8. Install Eclipse See http: Latest Version You are welcome to install the latest version of Eclipse on your home system, no matter what is installed on the lab computers.
To download the latest version of Eclipse, go to: Lab Version There is sometimes a disconnect between the packages available for Eclipse under Ubuntu, and the latest version of Eclipse available. Download this version at: Mac and Java You may have some issues running Java 7 and Eclipse 3. You can see this bug report: To do this, go to the following URL: Configuring Eclipse.
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