Every time I try running a Java program through my command line I get this:
error(Error: could not open `C:\Program Files\Java\jre1.8.0_191\lib\amd64\jvm.cfg').
I'm just learning. This is my code I'm trying to run:
class cows2{
public static void main(String[] args){
System.out.println("Hello Friend");
}
}
Here is my command line with the error.
Related
I have been trying to run Java with command line arguments, but for some reason the class can not be found. I am very certain the directory is correct. Is there any way to fix this?
CLDemo.java file
public class Demo {
public static void main(String[] args) {
System.out.print("It works!!!");
}
}
You need to do cd out\production before java CLDemo.
The default compile output of IntelliJ IDEA is under out\production folder, and Java needs to run at the corresponding package (folder) of your compile output.
I am trying to run a simple Java program in Atom, with no success.
My code:
public class Hello {
public static void main(String[] args) {
System.out.println("Hello World");
}
}
I use the cmd-i shortcut to run the code, and get the following error:
javac: invalid flag: /Users/xxxxx/Desktop/Programming/Atom (text editor)/AtomPrograms/AAA first test
Usage: javac
use --help for a list of possible options
[Finished in 0.586s]
The file did not have the same name as the class name.
It runs now.
Thank you
I was going through some basic java concepts. I was looking into methods and trying to verify this error
"MethodSignature.java:10: error: method m1(String) is already defined in class MethodSignature
public static void m1(String s)"
The above error appears when I run from command prompt. But when running through eclipse, although it shows error, program prints the desired strings. I do not get any error as stated above in case of command prompt.
Why there is a difference in execution in Eclipse and command prompt?
As in command prompt, I am not able to run the program itself because the error should stop me. I was expecting the same in Eclipse.
Here is my simple program.
public static void m1(String s)
{
System.out.println(s);
}
public static void m1(String s)
{
System.out.println(s);
}
public static void main(String[] args)
{
m1("call one");
m1("call two");
}
You must be running a previously compiled class, you cannot declare m1 twice. However, eclipse does have its' own compiler (ecj); and it is possible to run code ignoring errors (in which case it removes the invalid code for you).
I made simple hello world app Java file.
I tried to compile it on command prompt in windows and went very well.
but when I try to run it with Java the command prompt says the following error.
Error: Could not find or load main class "Project Name".
but when I checked the folder the file "Project Name".class is existed moreover I have main in it.
why I get this error ?
Edit :
file name : HelloWorldApp.java
code :
package helloworldapp;
/** * The HelloWorldApp class implements an application that
* simply prints "Hello World!" to standard output. */
public class HelloWorldApp
{ /* * #param args the command line arguments */
public static void main(String[] args)
{
System.out.println("Hello World!"); // Display the string
}
}
Try adding the current directory to the class path when you run it, and included the package name
java -cp . helloworldapp.HelloWorldApp
I'm just starting Java ... again.
I just made a simple program
class first
{
public static void main()
{
System.out.println("Hello!");
}
}
This runs perfectly fine in BlueJ but it gives an error during run-time when running from command prompt.
This is the error
Exception in thread "main" java.lang.NoSuchMethodError: main
It's because I didn't give String args[] in the main parameter list
Till now, I used to give it subconsciously. I know that the string array contains all the parameter values when running but then why is it running in BlueJ?
(BlueJ is a student-friendly Java editor and compiler)
Your program is valid and will compile to the same thing whether you compile from BlueJ or from the command line.
However, blueJ will let you run any static method in a class (so you can test your functions) where as the command line java command will (only) look for a special main method to run. This main method tages a String array with all the command line parameters and your program should look like this even though you don't use these command line parameters:
class first
{
public static void main(String[] args)
{
System.out.println("Hello!");
}
}