如何将Arraylist拆分为较小的列表？

Question

public Student(String name, String sch, int stay, String year)
{
    String name1 = getInput("Enter your name:");
    this.name = name1;  
    String sch1 = getInput("Enter your scholarship:");
    this.sch = sch1;    
    String number = getInput("Enter years of stay: ");
    this.stay = Integer.parseInt(number);

    for (int i=0; i < programList.size(); i++)
    {
        if (stay==1)
        {
        //If the student's year of stay is only 1 year I will  put he/she to the "freshmenList". How will I do that?
        }

    }

Here's my code. I want to sort the inputed elements to a new ArrayList according to the years of stay input. (If year of stay = 1 then freshmen arraylist, if=2 then sophomore arraylist, so on). How will I do that? Thank you!

Answer 1

I recommend that you would use a switch for this, they are a bit better readable (imo) and are supposed to be faster than a bunch of if statements:

switch (stay)
{
    case 1:
        freshmenList.add(this);
        break;

    case 2:
        sophomoreList.add(this);
        break;

    ...
    default:
        //Do something with invalid answers
}