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TextIO.java  RSS feed

 
Talal Harmoush
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Hello everyone,

I'm fairly new to java and have been running into multiple issues regarding using TextIO.

Could i get some help regarding how to make it work. I have saved the code for TextIO in a new project in my eclipse IDE and tried running that and i usually end up with the following error messages:

"Error: Could not find or load main class TextIO"

"The archive: /TextIO/bin/MainPackage which is referenced by the classpath, does not exist."

"selection does not contain main type"

i really could use the help, thanks in advance.
 
Knute Snortum
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Welcome to the Ranch!

Could you post the code and the exact error message (with the stack trace)? Be sure to UseCodeTags (that's a link).
 
Talal Harmoush
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Hey Knute, the error messages are exactly what i sent.

The code is that of TextIO.java and you can find it anywhere online.
 
Ron McLeod
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Talal - the more details you provide, the more likely someone will want to and be able to help.

If you are referring to this TextIO.java, you will see that contains a collection of static methods for manipulating text -- it isn't runnable on its own. How are you using TextIO in your application?
 
Talal Harmoush
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Well, i copied and pasted the content of TextIO.java (the link you sent me is the one) into a new project in Eclipse and tried to run that.

The error messages i received are the ones mentioned in the first post.

Let me know if there is any more information i can provide.
 
Carey Brown
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Talal Harmoush wrote:Well, i copied and pasted the content of TextIO.java (the link you sent me is the one) into a new project in Eclipse and tried to run that.

The error messages i received are the ones mentioned in the first post.

Let me know if there is any more information i can provide.

Does the file contain a method with the signature

If not, then you can't run it. Period.
 
Talal Harmoush
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It doesnt contain that i think.

But how can i save the TextIO.java file so that i can use its class the same way i'd use Scanner?

 
Carey Brown
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Excerpt from http://math.hws.edu/javanotes/c2/s4.html
"To use the TextIO class, you must make sure that the class is available to your program. What this means depends on the Java programming environment that you are using. In general, you just have to add the source code file, TextIO.java, to the same directory that contains your main program. See Section 2.6 for information about how to use TextIO.

The input routines in the TextIO class are static member functions. (Static member functions were introduced in the previous section.) Let's suppose that you want your program to read an integer typed in by the user. The TextIO class contains a static member function named getlnInt that you can use for this purpose. Since this function is contained in the TextIO class, you have to refer to it in your program as TextIO.getlnInt. The function has no parameters, so a complete call to the function takes the form "TextIO.getlnInt()". This function call represents the int value typed by the user, and you have to do something with the returned value, such as assign it to a variable. For example, if userInput is a variable of type int (created with a declaration statement "int userInput;"), then you could use the assignment statement"

userInput = TextIO.getlnInt();

To call a class's static method, you specify the class name, dot (.), followed by the method name shown above.

Somewhere you must provide a class with a main() method and have that method call TextIO.getInInt(), either directly or indirectly.
 
Carey Brown
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Talal Harmoush wrote:But how can i save the TextIO.java file so that i can use its class the same way i'd use Scanner?
I'm not understanding your problem with saving TextIO.java. You have the file "TextIO.java", right? You have a directory where all java files are being put for your project? Then copy the former into the latter. Done.
 
Carey Brown
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TextIO does not work the same way Scanner works. With Scanner to have to create a new instance of a Scanner object and then use that instance to invoke the Scanner's methods. TextIO, on the other hand, contains nothing but static methods, therefore you don't need to instantiate an instance of TextIO, in fact, you can't.
 
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