Lesson 1-1 code is correct?

Hi all.

I just started watching a course and have finished all the chapters of lesson 1, no homework and quiz.

So we in Lesson 1-1 example usage of lambda expressions (with my method createStudentsList() to fill the list):

Students list < student > = createStudentsList();

Double highestScore = 0.0;

for (s student: students) {}

If (s.getGradYear () == 2011) {}

If (s.getScore () > highestScore) {}

highestScore = s.getScore ();

}

}

}

It compiles and works.

But the proposed changes by using lambda expressions does not work:

Students list < student > = createStudentsList();

Double highestScore = student

filter (new predicate < student > () {})

public boolean test (Student's t) {}

return t.getGradYear () is 2011;

}

})

.map (Mapper new student, < Double > () {})

public Double extracted (student s) {}

Return s.getScore ();

}

})

. Max();

saying "the filter method (new predicate < student > () {}) is undefined for the type List < student >" and "Mapper cannot be resolved to a type.

Even the latest version of the code does not compile:

Students list < student > = createStudentsList();

highestScore = student

filter (student s-> s.getGradYear () == 2011)

.map (student s-> s.getScore ())

. Max();

with "syntax error, insert ';' to complete the statement" for the two statements of student.

I managed to make it work with this approach:

Students list < student > = createStudentsList();

Double highestScoreL = student

. Stream()

filter (s-> s.getGradYear () == 2011)

.mapToDouble (s-> s.getScore ())

. Max()

. getAsDouble();

I do wrong or just missed sth sth important? Sorry for the question so long - it is because as pieces of code .

BTW I use Eclipse March 4.5.0 and jdk1.8.0_51 if that matters.

There is problem with your code. I fixed your code and it would be:

Student s0 = new Student(2014, 685);

Student s1 = new Student(2014, 675);

Student s2 = new Student(2014, 635);

Student s3 = new Student(2014, 985);

List of students of = Arrays.asList (s0, s1, s2, s3);

Stream studentStream;

studentStream = students.stream ().

filter (new predicate() {}

@Override

public boolean test (Student's t) {}

return t.getGradYear () is 2014;

}

});

Stream highestScoreStream = studentStream.map (new function() {}

@Override

public Double apply (student s) {}

Return s.getScore ();

}

});

HighScore = highestScoreStream.max of in option (new comparator() {}

@Override

public int compare (Double d1, d2 Double) {}

Return d1.compareTo (d2);

}

});

Double highestScore = highScore.get ();

System.out.println (highestScore);

Make sure and tell me if you don't get anything. This is the detailed code pre JDK8 average. Now you can write it as functional programming.

and Yes... The video code is just for us to understand. It is not syntactically correct as map is not a FunctionalInterface in JDK8.

Tags: Java

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