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Thread: Two Issues with OpenJDK 17 on Windows 10 64 bit Home.

  1. #1
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    Default Two Issues with OpenJDK 17 on Windows 10 64 bit Home.

    I have a tiny little Java OpenJDK 17 Module file, module-info.java,
    ---------------------------
    module JavaApplication
    {
    requires java.base;
    }
    ---------------------------
    and Netbeans 12.5 is giving me the following errors:

    C:\Users\User\Documents\NetBeansProjects\JavaAppli cation1\src\Java1\Start.java:1: error: file should be on source path, or on patch path for module
    package Java1;
    C:\Users\User\Documents\NetBeansProjects\JavaAppli cation1\src\Java1\module-info.java:1: error: file should be on source path, or on patch path for module
    module JavaApplication
    2 errors

    -If I have a Java application, where exactly am I supposed to put the module file itself, what do I do to get it to compile and insert correctly?
    Particularly in a Netbeans 12.5 Java Application?

    The originators of Java have posted a Java Enhancement Proposal statement on the web.
    What it refers to is the floating point arithmetic behaviour in Java 1.1.
    It also refers to SSE, a phenomenon in other language, such as C++.
    They do refer to the original floating support semantics
    that were there in version 1.1 of Java.

    What they are describing, in these terms, is floating point arithmetic without
    error phenomenon. A circumstance where:
    ---------------------------
    package Java1;

    import static java.lang.System.*;

    public class Start
    {
    public static void main(String[] args)
    {
    out.println("Greetings");

    out.println();

    float a = 0.1F;

    float b = 0.1F;

    float c = a*b;

    out.println(c);

    double d = 0.1D;

    double e = 0.1D;

    double f = d*e;

    out.println(f);

    out.println();

    out.println("Goodbye.");
    }
    }
    ---------------------------
    should prints the solution 0.01 in both instances, instead of

    0.010000001
    0.010000000000000002

    I am on Windows 10 64 bit Home, and am using Netbeans 12.5 successfully, but on
    top of Java OpenJDK 17.

    -Most importantly, JEP 306 refers to the adjustment of these very floating
    point calculations, such that this code example will output

    0.01
    0.01

    and nothing further, according to the language used on the JEP post.
    How can I get the latter defaulting floating point defaulting behaviour with
    OpenJDK 17?

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Two Issues with OpenJDK 17 on Windows 10 64 bit Home.

    should prints the solution 0.01 in both instances, instead of

    0.010000001
    0.010000000000000002
    Yes, the computer does not hold floating numbers as precise as we would hope.
    There are some discussions here: http://docs.oracle.com/cd/E19957-01/..._goldberg.html

    For more technically competent programmers, try asking here:
    http://www.coderanch.com/forums
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Two Issues with OpenJDK 17 on Windows 10 64 bit Home.

    For more: https://coderanch.com/t/747172/java/...oint-Behaviour

    If you want precision use a class like BigDecimal.
    If you don't understand my answer, don't ignore it, ask a question.

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