I start coding java with VScode recently. I have a simple problem. The problem is that I do not want the output to be like that. In other words, I do not want the program to run in the terminal as shown below. I just want the statements to be printed alone. Here, I just want (Hello world) only to be printed with nothing else. I googled how to run a java program and I found that the output must appear in either OUTPUT or DEBUG CONSOLE.
Can anyone please help me?. NOTE: I installed java 14 as well as all needed extensions in VScode for java.
If your code needn't input data, you can add this in the launch.json:
"console": "internalConsole"
The default value is:
"console": "integratedTerminal"
I do not suggest install the 'Code-Runner' extension, because it will compile the java file under the same folder of the java file, and mix them up.
And I recommended you to get used to the outputs, the outputs can provide useful information, let you know what's exactly the vscode does. If you run into some problems, you will need this information to help you to solve the problem.
In this case, you can just press Command F5 (Mac) or other keybindings (https://code.visualstudio.com/docs/getstarted/keybindings). This runs the program in your IDE. Otherwise, you can create a launch.json file to configure your debugging.
What you want to do is follow the instruction in Run and Debug Java in VS Code to setup a launch.json file. This defines how your code is launched and where the output from that debug session goes. You can customize the Debug output that appears by adding and configuring the User Settings for the Microsoft Java Debugger
Here are some things which you can do:
If you have installed all necessary extension packs, then the editor would display an option to Run & Debug the class on the code itself. (rare cases but it appeared while working in Linux)
Else type javac <name.java> in the terminal(output will be displayed in Terminal tab)
Or install the code runner extension which is available in VS Code Marketplace (that would display results in output tab easily)
Related
why does vsc show this when running the program
Just like #Alexander Makarov said, these are execution scripts and VS Code displays them to let developers know what's going on during this process.
From your screenshot, we can know:
You're debugging a project and this is your debug script execution path;
This process uses jdk-14 as java version to compile, and coding style is UTF-8;
The current project cache is stored in this directory;
hello is the name of current debugging .java file.
This is a default setting provided by VS Code, and if you don't like it, #anurag saxena had provided a way, also installing the extension Code Runner is another choice. Add the following code in settings.json:
"code-runner.clearPreviousOutput": true,
"code-runner.showExecutionMessage": false,
Then every time you run code, there's no execution script before the ouput.
That's the default behavior in VS code, so to hide unnecessary info
you can go in
preferences-> settings and search for (Java › Debug › Settings: Console) Change its setting from default to (internalconsole) and that's it. you will get a terminal path free output on debug console
I'm interested in being able to automatically clear the terminal every time I run my code (Java program with a main method that may or may not have packages inside the file). Code Runner only runs single class Java files and doesn't work with Java files that have packages so I'm not interested in that.
At the momement I'm running all my Java files by clicking on the "Run and Debug" button in VS Code. I'm aware that I can manually clear the console using Command + K (Mac) but doing this for every run feels repetitive so I'm looking for a way to do this automatically. Every time I click that run and debug button I'd like for it to clear the console before running an code. Is there also anyway to show a run button that maps to VS Code's "Run and Debug Button (Similar to the way Code Runner does it by displaying a run/triangle icon (left a screenshot below). Currently I have to make two clicks in order to click "Run and Debug".
I'm only looking for a solution that doesn't involve changing any Java files so something that involves changing settings/using an extension/related on VS code. I'm not looking to modify any Java file. Code Runner has the functionality I desire (clear terminal automatically) but doesn't work with all types of Java files so it again can't be used.
You could just put this line in your java file to clear the terminal.
For Windows:
Runtime.getRuntime().exec("cls");
For Linux:
Runtime.getRuntime().exec("clear");
If you can modify your output you can print an ANSI clear screen escape sequence before printing your first line of output.
System.out.println("\033[2J\033[1;1H");
Note, this will only work with VTE based terminals like Terminal.app, iTerm, almost all linux terminal emulators, Windows Powershell etc.
This problem is really becoming frustrating for me. I have this plugin which has a command, which works perfectly during runtime. When I click on the command during runtime, it does what it is expected to do (create a .cfg file from a .c file). After installation, I am encountering two issues:
The handler does not fire after I click on the command.
Nothing is printed on the console. I have another plugin whose handlers do what is expected of them after installation, but they fail to print any output to the console.
Where am I going wrong? Could someone please help?
Thank you.
Note: When I click on the command, the control actually goes into the handler class. It is just that it does nothing.
The Eclipse console shows the output of programs you are testing, it does not show the output of any plugins installed in Eclipse.
The output of things like System.out.print are discarded unless Eclipse is started with the -consoleLog option (and even then the output is not put in the console).
A plugin can use the various console APIs to create a console for output or to access an existing console.
I'm in the process of porting simple console apps written in C++ to Java in order to show how similar the languages are, and how code can be ported. I've exported executable JARs for the programs using Eclipse. These JARs work fine when they are run using the java -jar command. However, they do not run properly when executed from windows explorer (double clicked). A console window simply opens and closes rapidly.
The only solution I have found thus far is to use a batch file. Is there any other option?
There are some options:
Sleep a bit when the program is done, so you can read the output.
Call System.in.read() (again at the end of the program), which will wait until you type a char and hits enter.
Create your own little swing terminal, which doesn't close when the application code is done.
This seems like the jre used from the command line and from the registry are not the same (this can occur when multiple JRE's are installed)
Have you checked in your windows registry what is the jre used to run the executable jars ?
You can find more on the registry settings on sun's site
Seems to me that your main class does not even gets executed.
This would explain the quick open/close of console window.
Or is it possible that another program than java has the "jar" file type?
Happened to me after installing a Nokia software.
Using a batch file seems to be my best option. I suppose that's why Eclipse has a launcher.
Change the open with program to
c:\Program files\java\jre7\bin\javaw.exe
I created a Java applet program and compiled it. As a result of the compilation, it generated a class file. But, it showed the following warning message while running the applet with the command prompt using the appletviewer command.
D:\Applets\Applets>appletviewer FirstApplet.java
Warning: Can't read AppletViewer properties file: C:eswaran_s.VMSPL\.hotjava\properties Using defaults.
When I run this command once again, it does not show the warning message, but the applet is not running.
How can I solve this issue?
My solution to this problem was to simply (in Eclipse) go to Run-> Run configurations... and open the JRE card where I set Java SE to a newer installed version. (in my case from SE 6 to SE 7)
The file .appletviewer should be in your home folder. If it's not exist then default file is created. You can also place it in the %USERPROFILE%\.hotjava\properties.
If you run appletviewer it runs because you got any message from it. Suppose your instance is created on the %PATH%. But to run properly you should supply the argument text file that contains deprecated <APPLET> tag. It doesn't matter what extension it has.
Your extension is wrong. You should pass HTML file path like this:
D:\Applets\Applets>appletviewer htmlfile_name.html
Instead of this:
D:\Applets\Applets>appletviewer FirstApplet.java
It is often very difficult to write, compile and run applets in the applet viewer from the command prompt. A better way would be to download the program Eclipse from the Internet. I often got lots of errors when trying to run programs from the command prompt, and Eclipse automaticly compiles, emphasises special words (like new, break, byte, short etc.) and even error checks your code (it underlines errors with a squiggly red line like Microsoft word's spellcheck). All my problems have been solved! I seriously recommend downloading it.
i think your jdk miss some package or loss path so re-installed jdk latest version and run your program. and check your htm program is correct or not may be some time occurred due to wrong htm program.
I had the same problem following the instructions for a similar tutorial from Oracle's Java: A Beginner's Guide - Sixth Edition (pg 515). The directions tell you to immediately run the .java file with the applet viewer. However, you must first compile it. So, C:>javac FirstApplet.java. This will compile the program and create your FirstApplet class file, which is what is currently missing from your execution. Then, C:>appletviewer FirstApplet.java. Your applet should run fine. Seems odd that the tutorial would leave out this instruction.
Shoutout to RAB teaching broken code (Applets have been deprecated in most browsers)
First, make sure you have the javadoc folder (simply labelled "doc" once extracted) inside your jdk folder as advised here:
http://www.jcreator.com/installation.htm
You can download the doc file from here for Java SE 8:
http://www.oracle.com/technetwork/java/javase/documentation/jdk8-doc-downloads-2133158.html
Make sure you build the project first before running it (Menu/Build/Build Project).
Now run your project.
if you are using command line to run the file, use this particular line after importing packages.
/*<applet code = "Class_name.class" width=300 height=250></applet>*/
I have change this line in the prompt and ready:
D:\Applets\Applets>appletviewer FirstApplet.java