What's wrong with this program?

[java_aim]

First_Cup.java
----------------------------------------------------------------------------

import java.awt.Rectangle;

public class First_Cup {

public static void main(String[] args){
Rectangle cerealBox = new Rectangle(5,10,20,30);
cerealBox.translate(15,25);
System.out.println(cerealBox);
System.out.println("First Cup!");
}
}

I could compile this program successfully; but the byte code could not possibly run.
I have no idea why it could not run. Could somebody tell me why?

Runtime Error Message:

Exception in thread "main" java.lang.NoClassDefFoundError: First_Cup/class

Could not find the main class: First_Cup.class. Program will exit.

[JosAH]

I bet you tried to run it as

java First_Cup.class

Don't do that and read the tutorials how you are supposed to run your class.

kind regards,

Jos

[java_aim]

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I have run the command already; yet it still does not work.

[JosAH]

---

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I have run the command already; yet it still does not work.

"does not work" is not a very detailed problem description.

Jos

[java_aim]

The newly received message:

Exception in thread "main" java.lang.UnsupportedClassVersionError: First_Cup : Unsupported major.minor version 51.0

...

Could not find the main class: First_Cup. Program will exit.

[JosAH]

The newly received message:

Exception in thread "main" java.lang.UnsupportedClassVersionError: First_Cup : Unsupported major.minor version 51.0

...

Could not find the main class: First_Cup. Program will exit.

Type this:

javac -version
java -version

and show us the results; I suspect that you're using different versions for compilation and running the stuff.

kind regards,

Jos

[java_aim]

Sorry. It's just worked.

[JosAH]

Sorry. It's just worked.

Care to explain what you did to fix it?

kind regards,

Jos

[java_aim]

I just reinstalled JDK. :D (1.7)