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Thread: Beginner code

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    Default Beginner code

    Hi everyone,

    I'm just starting to learn Java. I copied the following program from a textbook, but it doesn't seem to work for some reason. I'd appreciate your help.

    Here's the code:


    public class Hello {
    public static void main(String[] args) {
    System.out.println("Hello, world!");
    }
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Beginner code

    Please copy and paste here the full text of any error messages you get. Explain what you have done and what happens when you do it.

    Have you read the tutorial that explains how to compile and execute java programs?
    Lesson: The "Hello World!" Application (The Java™ Tutorials > Getting Started)
    Click on the link for the system you are on.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Beginner code

    what kind of IDE are you using?
    if you are using notepad, I suggest you download an IDE such as Eclipse online. They have very easy tutorials on how to use them, and it makes programming much easier.
    Here's a link: Eclipse Downloads
    The second download is suitable for most programmers and students

    other than the IDE, I don't see anything wrong with the code.

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    Default Re: Beginner code

    if you are using notepad, I suggest you download an IDE such as Eclipse online. They have very easy tutorials on how to use them, and it makes programming much easier.
    If one is a beginner, as the original post would suggest, I would hesitate to recommend this advice. While IDE's do make things easier for more advanced programmers, there are many concepts which become hidden through an IDE and can only be learned by command line programming. Plus, this is suggestive that an IDE will solve the original issue, which we don't even know what it is.

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    Default Re: Beginner code

    Seems like you havn't specified what package it should be in.

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    Default Re: Beginner code

    @djl1990 Classes do not have to be in packages.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Beginner code

    Quote Originally Posted by Norm View Post
    Please copy and paste here the full text of any error messages you get. Explain what you have done and what happens when you do it.

    Have you read the tutorial that explains how to compile and execute java programs?
    Lesson: The "Hello World!" Application (The Java™ Tutorials > Getting Started)
    Click on the link for the system you are on.
    Hi Norm. Here is the error message I received:
    xception in thread "main" java.lang.ExceptionInInitializerError
    Caused by: java.lang.RuntimeException: Uncompilable source code - class Hello is public, should be declared in a file named Hello.java
    at Hello.<clinit>(JavaApplication5.java:1)
    Java Result: 1

    I'll take a loot at the tutorial. I got the original program from a class textbook. I can't take the class right now, so I am reading the text as the next best option.

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    Default Re: Beginner code

    Yes, I am very much a beginner. I got the code from a book I bought: Building Java Programs: A Back to Basics Approach, 2nd edition
    by Stuart Reges and Marty Stepp.

    Also, I downloaded BlueJ. I was able to get the code compiled, but couldn't get it to run. I apologize, but I'm still learning the definition of such terms as class and package as they relate to Java.

    I know you're busy, so I appreciate your help. Java looks like a lot of fun!

  9. #9
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    Default Re: Beginner code

    class Hello is public, should be declared in a file named Hello.java
    What is the name of the .java file? The compiler says what the problem is. Name the file: Hello.java

    I was able to get the code compiled
    The compile was not successful. The above is a compiler error message.
    You need to get rid of compiler errors before you can run the code.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Beginner code

    Quote Originally Posted by Norm View Post
    What is the name of the .java file? The compiler says what the problem is. Name the file: Hello.java


    The compile was not successful. The above is a compiler error message.
    You need to get rid of compiler errors before you can run the code.
    -------------

    How do I name the file?

  11. #11
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    Default Re: Beginner code

    How do I name the file?
    That depends on what OS you are on. Most OSs have a rename command. Find that and use it to rename the file. On windows, right click the file and select the Rename option. Type the new name over the old one.
    Or edit the existing file and save it with the new name.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Beginner code

    Thanks for the help. I talked to a teacher at a local community college. She recommended the book Building Java™ Programs: A Back to Basics Approach, 2/e It looks good. I'm going to use BlueJ for the IDE. I finally found what looks like a good tutorial on how to use it:Creating and Running programs in BlueJ. I wish I could take a class on Java so I could talk to someone face-to-face, but that won't work with my schedule right now. Still, this forum looks good. I appreciate everyone's help.

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