This command will simply insert the appropriate "java M圜lass" text into the Interactions Pane to run the current class's main method.ĭrJava also displays either a "Run Project" or a "Run" button in its toolbar, depending on whether you have specified a "Main Class" for the project or not, respectively. Note that this feature does not support passing special flags or arguments to the JVM itself, as is supported on the command line.Īnother shortcut for this feature is the "Run Document's Main Method" command, which can be found in both the Tools menu and the context menu of the document list. For example, to run M圜lass with args "arg1" and "arg2", type the following into the Interactions Pane: java M圜lass arg1 arg2 Running the Main Method. For convenience, DrJava supports calling the main method of a class in the Interactions Pane by simply entering "java" followed by the class name and any arguments. This will also reset the Debugger and any JUnit tests that are currently running. To do this, simply choose the "Reset Interactions" command from the Tools menu. Resetting removes any variables from scope and terminates any methods running in the Interactions Pane. Resetting the Interactions Pane. You can reset the Interactions Pane if you wish to start from scratch or if a method call hangs and does not return. This feature makes declaring loops, methods, and classes very clean. If it finds that the input is not complete (unmatched braces or a missing semicolon, for example), it will automatically insert a newline, prompting you for more input on the next line. Intelligent Newlines. DrJava parses your input each time Enter is pressed. > JFrame frame = new JFrame("My JFrame") Here is a simple interactions session, to demonstrate how the Interactions Pane can be used to experiment with objects or show GUI components. These colors can be modified in the "Colors" section in the Preferences window. Any system input will cause a box to be inserted in the Interactions Pane where you can type what you want System.in to read. Any system output will be displayed in the Interactions Pane in green (as well as in the Console tab), while system errors will be displayed in red by default. Result objects are displayed using the object's toString() method.
In general, any statement or expression ending without a semicolon will display its result in the Interactions Pane, while those ending with a semicolon will complete without displaying a result. Simply define variables and call methods as you would in an ordinary method, or even define new classes and methods and call them interactively.
Run arguments jgrasp how to#
How to Use. The Interactions Pane supports the execution of any valid Java statements as well as the evaluation of Java expressions. The Interactions Pane can also be used to experiment with your own programs or new libraries, or even to create graphical user interfaces interactively.
Run arguments jgrasp full#
From a teaching standpoint, the Interactions Pane is a very easy way to help students learn to write Java without having to explain the full meaning of syntax like "public static void main", and it also provides an ideal way to perform demonstrations in class. This is remarkably useful for beginning students, who no longer have to learn to write main methods, recompile, and run programs from a command line simply to test how a new class or method behaves. One of the key distinguishing features of DrJava is its Interactions Pane, which allows you to enter and evaluate Java statements and expressions on the fly. Thats your answer.Table of Contents System.in and Closing the Input Stream Imports in the Interactions Pane
Run arguments jgrasp code#
Thats why you get the error not sure if the rest of ur code is good or not but since you asked about the error.
You forgot to make main static which is required since you dont actually have an instance of the main method. I tend to declare my classes as public but i'm not 100% sure thats required but it is required to declare your main method as. Patient = new People( patient.name, patient.height, patient.weight, x) Patient = new People(patient.name, patient.height, patient.weight, x) ("Enter the following information for the patient: ") Public void main(String args) throws IOException Public People(String name, double height, double weight, String sex) The name of the program is the name of the "main" class. jGRASP wedge2: exit code for process is 1. When I run it, I get the following error: : main
I'm having a problem with a program which will compile but not run.