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Editorial Team
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Asked: 2026-05-28T00:30:21+00:00

I must have done something very stupid which has caused the following situation. Basically

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I must have done something very stupid which has caused the following situation. Basically after compilation of code which I had compiled successfully lots of times previously, all of the .class files have all of a sudden been put in the package folders, where the .java files are. Some of the .class files have even numbers in the names like.

ClassName.java
ClassName.class
ClassName$1.class
ClassName$2.class
ClassName$3.class
ClassName$4.class

It looks a mess in the Navigator and rebuilding or cleaning the project doesn’t make these files go away.

The last code change I made, which has now been reverted was in the class static field:

static {
    if (System.getProperty("os.name").startsWith("Mac OS X")) { CONTROL_PANEL_WIDTH = 225; }
    else { CONTROL_PANEL_WIDTH = 180; }

System.out.println(System.getProperty("os.name")); // this is what I added; perhaps it was stupid
}

I must have done something silly. Can you help please?

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1 Answer

  1. Editorial Team

    You might have switched your default output folder of your classes, which can be fixed by right click your project -> Properties -> Java Build Path -> Tab Source -> Default Output folder (set it to <ProjectName>/bin)

    You could also check the .classpath file in your workspace which have to look like this (the path of the output folder is stored relative):

    <?xml version="1.0" encoding="UTF-8"?>
<classpath>
    <classpathentry kind="src" path="src"/>
    <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
    <classpathentry kind="output" path="bin"/>
</classpath>
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