little help
From RoboWiki
Fragment of a discussion from User talk:Rigged
Compiling... Arg.java:32: package Point2D does not exist public Point2D.Double guessPosition(long when) { ^ Arg.java:36: cannot find symbol symbol : variable time location: class argeaer.Arg double diff = when - time; ^ Arg.java:40: cannot find symbol symbol : variable changehead location: class argeaer.Arg if (Math.abs(changehead) > 0.00001) { ^ Arg.java:41: cannot find symbol symbol : variable speed location: class argeaer.Arg double radius = speed/changehead; ^ Arg.java:41: cannot find symbol symbol : variable changehead location: class argeaer.Arg double radius = speed/changehead; ^ Arg.java:42: cannot find symbol symbol : variable changehead location: class argeaer.Arg double tothead = diff * changehead; ^ Arg.java:43: cannot find symbol symbol : variable y location: class argeaer.Arg newY = y + (Math.sin(heading + tothead) * radius) - ^ Arg.java:43: cannot find symbol symbol : variable heading location: class argeaer.Arg newY = y + (Math.sin(heading + tothead) * radius) - ^ Arg.java:43: sin(double) in java.lang.Math cannot be applied to (<nulltype>) newY = y + (Math.sin(heading + tothead) * radius) - ^ Arg.java:44: cannot find symbol symbol : variable heading location: class argeaer.Arg (Math.sin(heading) * radius); ^ Arg.java:43: operator - cannot be applied to <nulltype>,double newY = y + (Math.sin(heading + tothead) * radius) - ^ Arg.java:45: cannot find symbol symbol : variable x location: class argeaer.Arg newX = x + (Math.cos(heading) * radius) - ^ Arg.java:45: cannot find symbol symbol : variable heading location: class argeaer.Arg newX = x + (Math.cos(heading) * radius) - ^ Arg.java:46: cannot find symbol symbol : variable heading location: class argeaer.Arg (Math.cos(heading + tothead) * radius); ^ Arg.java:46: cos(double) in java.lang.Math cannot be applied to (<nulltype>) (Math.cos(heading + tothead) * radius); ^ Arg.java:45: operator - cannot be applied to <nulltype>,double newX = x + (Math.cos(heading) * radius) - ^ Arg.java:51: cannot find symbol symbol : variable y location: class argeaer.Arg newY = y + Math.cos(heading) * speed * diff; ^ Arg.java:51: cannot find symbol symbol : variable heading location: class argeaer.Arg newY = y + Math.cos(heading) * speed * diff; ^ Arg.java:51: cannot find symbol symbol : variable speed location: class argeaer.Arg newY = y + Math.cos(heading) * speed * diff; ^ Arg.java:51: incompatible types found : <nulltype> required: double newY = y + Math.cos(heading) * speed * diff; ^ Arg.java:52: cannot find symbol symbol : variable x location: class argeaer.Arg newX = x + Math.sin(heading) * speed * diff; ^ Arg.java:52: cannot find symbol symbol : variable heading location: class argeaer.Arg newX = x + Math.sin(heading) * speed * diff; ^ Arg.java:52: cannot find symbol symbol : variable speed location: class argeaer.Arg newX = x + Math.sin(heading) * speed * diff; ^ Arg.java:52: incompatible types found : <nulltype> required: double newX = x + Math.sin(heading) * speed * diff; ^ Arg.java:54: package Point2D does not exist return new Point2D.Double(newX, newY); ^ 25 errors Compile Failed (1)
This errors does not match to code. But i may guess, that you need to read about java "package" and "import" keywords and in common some basic book about java
Jdev
Java Tutorial is a good place to learn Java.
And after getting used to the language, I recommend using some advanced IDE like Eclipse. All the errors above would be automatically corrected by pressing Ctrl-Shift-O.
MN
