Java Error in Running a Java Program

[aartiyadav]

Hello All, I am in learning face to java programming and to run my program at the command prompt, I downloaded the java development kit also known as JDK, and I set my windows 10 system path to:

C:\Program Files\Java\jdk-9.0.1\bin;C:\Program Files\Java\jre-9.0.1\bin

After writing a simple Hello World program with the following format:

 class test{

        public static void main(String[] args){

            System.out.println("Hello World!");
        }
    }

and running it on command prompt using

javac test.java

, and then writing

java test

the output says:

Error: Main method is not static in class test, please define the main method as:
public static void main(String[] args)

I have tried compiling my simple program on an online Java compiler and everything works fine.

As suggested, I am using online compiler this https://www.interviewbit.com/online-java-compiler/ and the output was:

import java.io.PrintStream;

      public class test {
          public test() {} public void main(String[] paramArrayOfString) {
               System.out.println("Hello World!");
          }
      }

Where is the problem coming from? How can I fix it? Any suggestions?

 

[Antero360]

Hello All, I am in learning face to java programming and to run my program at the command prompt, I downloaded the java development kit also known as JDK, and I set my windows 10 system path to:

C:\Program Files\Java\jdk-9.0.1\bin;C:\Program Files\Java\jre-9.0.1\bin

After writing a simple Hello World program with the following format:

 class test{

        public static void main(String[] args){

            System.out.println("Hello World!");
        }
    }

and running it on command prompt using


, and then writing


the output says:


I have tried compiling my simple program on an online Java compiler and everything works fine.

As suggested, I am using online compiler this https://www.interviewbit.com/online-java-compiler/ and the output was:

import java.io.PrintStream;

      public class test {
          public test() {} public void main(String[] paramArrayOfString) {
               System.out.println("Hello World!");
          }
      }

Where is the problem coming from? How can I fix it? Any suggestions?

Hi there... all you are missing is the keyword `static` in the main function signature

public static void main (String args[]){}

 

[Deleted member 2829]

all you are missing is the keyword `static` in the main function signature

Yes, the error message is quite specific about that. However the code in the original post is absolutely correct and worked fine for me. Maybe the OP edited their comment to add the missing keyword, without acknowledging you provided the solution ? If not, something is weird here. Could be the CLASSPATH is set to another folder of jarfile that has another test.class compiled from wrong code.

 

[gulshan212]

Hello All, I am in learning face to java programming and to run my program at the command prompt, I downloaded the java development kit also known as JDK, and I set my windows 10 system path to:

C:\Program Files\Java\jdk-9.0.1\bin;C:\Program Files\Java\jre-9.0.1\bin

After writing a simple Hello World program with the following format:

 class test{

        public static void main(String[] args){

            System.out.println("Hello World!");
        }
    }

and running it on command prompt using


, and then writing


the output says:


I have tried compiling my simple program on an online Java compiler and everything works fine.

As suggested, I am using online compiler this Online Java Compiler and the output was:

import java.io.PrintStream;

      public class test {
          public test() {} public void main(String[] paramArrayOfString) {
               System.out.println("Hello World!");
          }
      }

Where is the problem coming from? How can I fix it? Any suggestions?

First, ensure that the test.java file is located in the same directory as the commands for compilation and execution. Ensure the JDK is installed correctly on your Windows 10 computer, and double-check your Java installation if you still have problems.
I hope it will work.
Thanks

 

[JavaJames]

ensure that the test.java file is located in the same directory as the commands for compilation and execution

That's a convenient beginner hack to avoid setting up paths etc properly, but it's a really bad idea. The last place you should put your files is in someone else's installation folder. What happens when you update the JDK?
Moreover the Java compiler has built-in requirements about how the source files fit into directories that follow the code's package structure, so your advice will only work for trivial programs with only the unnamed package.
(... and did you notice the date of the original question? ...)

 

[cbreemer]

(... and did you notice the date of the original question? ...)

Indeed. And the fact this OP is one of those who dump a question but do not bother to even acknowledge any helpful replies 🙄