Java questions which don't deserve their own thread, yet.

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > The Cavern of COBOL > Java questions which don't deserve their own thread, yet.

imnotinsane: Jul 19, 2006

I can't seem to wrap my head around how I am meant to solve this issue, I think I am coming from the wrong angle.

If I have an class object that contains 3 values, for example Student() and it holds firstName, lastName, studentId.

I have then created an array of Student[] objects, so now i am holding something like

code:

Student[] list = new Student("John", "Smith", 123), new Student("George", "Citizen", 567), new Student("Alan", "Bates", 789);

Now if i wanted to sort them by say student id i can't really loop through the array list because all three values are held in the same object. I was thinking maybe I am meant to use a 2d array of objects, so that i have list[0][1-3] but then that would still leave me with the same problem as I am not really storing the actual value just the object it self that contains those three associated variables.

The other way I was thinking was to make a method that returned the values explicitly as array, for example, Student.getArrayValues() and I guess create a new 2d array list on the fly and then manually sort that through a loop and print the results but it feels like I'm doubling up my work for nothing and there should be a simpler method.

Any help would be appreciated

# ¿ Apr 9, 2024 10:39

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# ¿ May 5, 2024 15:33

imnotinsane: Jul 19, 2006

ivantod posted:

Maybe this will help you: https://www.baeldung.com/java-8-comparator-comparing.

By using the Arrays.sort(...) method you can give it a lambda function telling it how to compare the objects. This allows you to compare by one (or more) chosen fields (e.g. in your case student id).

Ahh that is exactly what I was looking for, thanks

# ¿ Apr 9, 2024 11:22

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