Either it's the people who write Java, or something intrinsic in the design of the language itself that drives people to write code in this extremely verbose way. I've always leaned towards the latter...
For example, assume I've got a list of students, and I want to show all the ones who haven't taken at least one exam, sorted by last name. Here's the relevant pseudocode in Rails:
class.students.select {|student| student.tests.inject(false) {|acc, test| acc || (!test.taken? )}}.sort {|a,b| a.last_name <=> b.last_name}
That just flows from my keyboard as a Ruby/Rails programmer, is pretty much instantly comprehensible to other Rails programmers, and (while others might disagree with stylistic choices, variable names, or whether to use that weird &syntax to do the sort) would be considered "good enough Rails code to ship."
I will take the liberty of pasting my Java implementation into a gist -to avoid breaking HN:
https://gist.github.com/3760402
A nice, svelte 38 line method, which will be reused via copy/paste a hundred places in my codebase.
Incidentally, at my previous Big Freaking Enterprise job, the user need "Make a page for a class where we can see all students who haven't..." would get quoted to them as "No problem, that will cost you $1,000. Are we green-lit to implement or do you want docs written first ($250)?", because the core logic I've shown you is the tip of the iceberg of how sucky that experience is going to be. We haven't even started with the XML files and annotations required to hook the new actions together yet. By comparison, as a Rails developer, in lieu of getting you to sign off on a $1,000 line-item to your next invoice I'm inclined to show you a totally working page and ask you "Is this what you wanted?" because implementing it is easier than talking about implementing it.
can be reduced even further using the all? method
!student.tests.all?(&:taken?)
public class Student implements Comparable<Student> {
@NotNull public List<Test> getTests() { ... }
@NotNull public String getLastName() { ... }
@Override public int compareTo(Student that) {
return getLastName().compareTo(that.getLastName());
}
}
List<Student> studentsWhoHaveNotTakenAtLeastOneTest() {
TreeSet<Student> studentsMissingAtLeastOneTest = new TreeSet<Student>();
for(Student student : getStudents()) {
boolean allTestsWereTaken = true;
for(Test test : student.getTests()) {
allTestsWereTaken &= test.isTaken();
}
if (!allTestsWereTaken) {
studentsMissingAtLeastOneTest.add(student);
}
}
return new ArrayList<Student>(studentsMissingAtLeastOneTest);
}
def studentsWhoHaveNotTakenAtLeastOneTest = getStudents.filter{s => s.getTests.filter{t => !t.isTaken}.size > 0}.sorted