To set a breakpoint on a particular statement, double-click the left-margin of that line or select "Toggle Breakpoint" from "Run" menu. You could set a breakpoint at the statement immediately outside the loop e. Alternatively, you can place the cursor on a particular statement, and issue "Run-To-Line" from the "Run" menu to continue execution up to the line.
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Always terminate your current debugging session using "Terminate" or "Resume" till the end of the program. Important: I can's stress more that mastering the use of debugger is crucial in programming.
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Explore the features provided by the debuggers. Step-Into and Step-Return: To debug a method , you need to use "Step-Into" to step into the first statement of the method.
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You could use "Step-Return" to return back to the caller, anywhere within the method. Alternatively, you could set a breakpoint inside a method. Modify the Value of a Variable: You can modify the value of a variable by entering a new value in the "Variable" panel. This is handy for temporarily modifying the behavior of a program, without changing the source code. 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:.
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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. Eclipse 2. Eclipse 3. Step 2: Unzip To install Eclipse, simply unzip the downloaded file into a directory of your choice e. 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.
You will receive a tarball e. Lock Eclipse on Launcher Simply start Eclipse. Choose an appropriate directory for your workspace , i.
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If the "Welcome" screen shows up, close it by clicking the "close" button next to the "Welcome" title. Step 1: 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. The "New Java Project" dialog pops up. In "Project name", enter " FirstProject ". Check "Use default location".
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But make sure that your JDK is 1. In "Project Layout", check "Use project folder as root for sources and class files". Push " Finish " button. In "Create module-info. Note: For easier version of Eclipse, you need to use the "Next" Button in the previous step, and 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. 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 1: Set an Initial Breakpoint A breakpoint suspends program execution for you to examine the internal states e. 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. 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. 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.
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. Don't use Find Ctrl-F , but use the above context-sensitive search. Ctrl-Shift-F: Format the source code.