Class Interface or enum expected

[ankiit]

Hi Mentors,

I am getting the following error in my program:-

"Class Interface or enum expected"

Please help me with this error.

Best Regards,
Ankit

[Eranga]

Could you please show your code. Just looking at what you have posted, quite difficult to comment.

[ankiit]

Hi Eranga,

Actually I have figured out the error now, I was by mistake using "Class" instead of "class" for defining the class interface.

But still I want to know all other possible causes of the error.

It would be very nice of you, if you put some light onto this

Thanks in advance
Best Regards,
Ankit

[JosAH]

Actually I have figured out the error now, I was by mistake using "Class" instead of "class" for defining the class interface.

But still I want to know all other possible causes of the error.

It would be very nice of you, if you put some light onto this

Syntactically only three different things can be defined at the top level of a source text: a class, an interface or an enum (all three are types in Java). Anything else makes the compiler complain as you have noticed.

kind regards,

Jos

[Eranga]

Hi Eranga,

Actually I have figured out the error now, I was by mistake using "Class" instead of "class" for defining the class interface.

But still I want to know all other possible causes of the error.

It would be very nice of you, if you put some light onto this

Thanks in advance
Best Regards,
Ankit

Jos give you a nice explanation on his last post.

[ankiit]

Thanks a lot Jos :), I will work accordingly.

[ankiit]

Hi All,

If i have declared a function in my class that has void as it's return type then can i use it in System.out.println(""+ fun()) ??

Here is the sample code..

class Box
{
    double width;
    double height;
    double depth;

	//Method declaration

	void vol()

	 {
	  
	 	System.out.println(width*height*depth)	;
		
	 }

}

class BoxDemo
{

	public static void main(String[] args)
	{
	 Box mbox1 = new Box();
	 Box mbox2= new Box();

/* Assigning  values to the instance variable*/

	mbox1.width=10;
	mbox1.height=20;
	mbox1.depth=15;

	mbox2.width=3;
	mbox2.height=6;
	mbox2.depth=10;

/* Calculating volumes*/

	System.out.print("the volume of box1 is:=" + mbox1.vol());

	System.out.print("the volume of box1 is:=");
	mbox2.vol();


	
	}

}

Here is the error:-

D:\JAVA\Practice>javac BoxDemo.java
BoxDemo.java:39: 'void' type not allowed here
System.out.print("the volume of box1 is:=" + mbox1.vol());

Please suggest.

Thanks
Ankit

[pbrockway2]

If i have declared a function in my class that has void as it's return type then can i use it in System.out.println(""+ fun()) ??

The compiler is saying "no": 'void' type not allowed here.

Have vol() return width*height*depth instead of printing it. And change its name to getVol().

Or leave it as it is, but change the name to printVol() and say:

System.out.print("the volume of box1 is:=");
mbox1.printVol();

The first approach is preferable because returning the volume will be useful in lots of contexts not just printing it.

[ankiit]

Hi pbrockway2,

Thanks a lot for the info.

I have made the changes suggested by you :), now the program is working fine and yes i have changed the name of the function to "getVol()".

Thanks
Ankit

[pbrockway2]

You're welcome.