java.lang.ClassNotFoundException error - Oracle Java tutorial

Question

I'm taking this oracle java tutorial and trying to use this code in Eclipse. I've been able to just create new classes and copy the code into the class. I can't seem to use this code in Eclipse. http://docs.oracle.com/javase/tutorial/java/nutsandbolts/examples/StringSwitchDemo.java

I keep getting Class not found errors. I named the class correctly.

Here's a screenshot. https://i.stack.imgur.com/r58wX.jpg

I don't understand what I need to change to allow the code to run.

public class StringSwitchDemo {

    public static int getMonthNumber(String month) {

        int monthNumber = 0;

        if (month == null) {
            return monthNumber;
        }

        switch (month.toLowerCase()) {
            case "january":
                monthNumber = 1;
                break;
            case "february":
                monthNumber = 2;
                break;
            case "march":
                monthNumber = 3;
                break;
            case "april":
                monthNumber = 4;
                break;
            case "may":
                monthNumber = 5;
                break;
            case "june":
                monthNumber = 6;
                break;
            case "july":
                monthNumber = 7;
                break;
            case "august":
                monthNumber = 8;
                break;
            case "september":
                monthNumber = 9;
                break;
            case "october":
                monthNumber = 10;
                break;
            case "november":
                monthNumber = 11;
                break;
            case "december":
                monthNumber = 12;
                break;
            default: 
                monthNumber = 0;
                break;
        }

        return monthNumber;
    }

    public static void main(String[] args) {

        String month = "August";

        int returnedMonthNumber =
            StringSwitchDemo.getMonthNumber(month);

        if (returnedMonthNumber == 0) {
            System.out.println("Invalid month");
        } else {
            System.out.println(returnedMonthNumber);
        }
    }
}

I got this errors in my IDE (Eclipse)

enter image description here

Just by any mean, do you have declared some class with name `String` among your classes? — Luiggi Mendoza, May 28 '14 at 21:47
Don't give screenshots. Copy/paste your code/messages into your question, taking care to indent 4 spaces (or use the `{}` button above the edit window to do so) so that they're formatted as "code". — Hot Licks, May 28 '14 at 21:48
No. You can see in the screenshot. No classes named String. All my practice classes before this have run fine. — StacyM, May 28 '14 at 21:49
Have you got something on the line above what the screen shot shows? Or is `public class StringSwitchDemo {` the first line of your file? — Dawood ibn Kareem, May 28 '14 at 21:49
public class StringSwitchDemo is the first line of the file. — StacyM, May 28 '14 at 21:49
OK, do you have the right number of `}` characters at the bottom? — Dawood ibn Kareem, May 28 '14 at 21:50
Your screenshot show several compile errors in your code. What do you see in the `problems` view? — azurefrog, May 28 '14 at 21:50
Please provide the complete code of your class here in your question (not as a comment). — Luiggi Mendoza, May 28 '14 at 21:51
Look like you have a Problem in your Project. Look at the Problems tab what can you see there? — Jens, May 28 '14 at 21:52
I'll post the code but its exactly the same as the code provided by the oracle tutorial. — StacyM, May 28 '14 at 21:52
Here's my Problems tab. What can I do to fix this? I never had this problem with my other Java exercises. http://i.imgur.com/KwaLv5n.png — StacyM, May 28 '14 at 21:55
In your first screen dump, there were four red stripes down the right hand side, next to the scrollbar. In your second screen dump, they weren't there. At what point did they disappear? — Dawood ibn Kareem, May 28 '14 at 21:55
From your last screenshot, looks like your Eclipse doesn't have the JDK 7 configured or that your project lost that configuration. — Luiggi Mendoza, May 28 '14 at 21:56
Sorry guys I've been trying sooo many things for the past hour. I don't know what happened to the four red stripes. — StacyM, May 28 '14 at 21:57
Whoops, and by "four" I mean "six". I'll go back to kindergarten and learn to count. — Dawood ibn Kareem, May 28 '14 at 21:58
can you check this ?? right-click project -> Properties -> Java Build Path -> libraries Does it show the jre system library? — rahul pasricha, May 28 '14 at 21:58
Here's my Java Build Path properties. http://imgur.com/ZhEWEMf — StacyM, May 28 '14 at 22:00
if you see the screenshot it shows unbound in the brackets after your jre. May be this might help you http://stackoverflow.com/questions/3542051/eclipse-frustration-with-java-1-7-unbound-library — rahul pasricha, May 28 '14 at 22:06
goto > windows > preferences > java > installed_jre > select jdk 7 > check path is correct and jdk is actually exist on that path — jmj, May 28 '14 at 22:09
Could someone help me with this sentence? "It's worth adding that on the preference pane for "Installed JREs", you can just hit the "Search" button to automatically locate JDK 7, if it is installed." Where is the preference pane? — StacyM, May 28 '14 at 22:11
it just says that if you go to the windows -> preferences -> java -> installed jre, on the right hand side you should see a search button, you can select your java installation directory by browsing through your system folders — rahul pasricha, May 28 '14 at 22:15

java.lang.ClassNotFoundException error - Oracle Java tutorial

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