class and testclass

[Besjamain Greenaway]

Hello :-)

I am working throught the head first book, and the subject now is about making a class and testclass. I get the impression that these two files should be seperate, so with one of the exercises I had to do I did;

  class Drumkit {
boolean topHat = true;
boolean snare = true;
 
void playSnare() {
System.out.println("bang bang ba-bang");
}
 
void playTopHat() {
System.out.println("ding ding da-ding");
}
 
}  

and the testclass;

  class DrumkitTestDrive {
 
public static void main(String[] args) {
 
Drumkit d = new Drumkit();
 
d.playSnare();
d.snare = false;
 
d.playtopHat();
 
if (d.snare == true);
d.playsnare();
}
 
}  

When I run it, it seems to compile, but then an error emerges;

DrumkitTestDrive.java:13: cannot find symbol
symbol : method playsnare()
location: class Drumkit
d.playsnare();
^

there's another one that says java:10:.

I've looked on the internet, and get the impression that something is not installed to make it work. Is this true?

[Henry Wong]

DrumkitTestDrive.java:13: cannot find symbol
symbol : method playsnare()
location: class Drumkit
d.playsnare();

Java is case sensitive. The method is playSnare(), with a capital S. The compiler can't find one with the lower case s.

Henry

[Besjamain Greenaway]

Thanks a lot! But wow, is that emberassing! Just a simple syntax prob

[Campbell Ritchie]

We have all made that sort of mistake. You could have written play Snare() instead, which has another error in.

Please don't write "if (d.snare == true) . . ." Write "if(d.snare) . . ." The "== true" is unnecessary. Try it.