Create list with different objects

Question

I have a method that takes in a List<> and adds all the numbers in the list together and returns if the number is = 100

My problem is that I want to use the same method for a number of different types of lists

So instead of having this

public boolean checkPercent(List<BarStaff> associates){..same..}
public boolean checkPercent(List<Waiters> associates){..same..}
public boolean checkPercent(List<KitchenStaff> associates){..same..}

I want to have this

public boolean checkPercent(List<could be any type> associates){..same..}

Instead of reusing the same code just of different lists, is there a way to use the same code for all the different types of lists (the staff have the same values in them so they are not different in any way)?

Matt Ball · Accepted Answer · 2012-07-17 15:20:41Z

8

You could use a parameterized method:

public <T> boolean checkPercent(List<T> associates)
{
    // snip...
}

or just accept any list:

public boolean checkPercent(List<?> associates)
{
    // snip...
}

answered Jul 17, 2012 at 15:20

Matt Ball

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Howard · Accepted Answer · 2012-07-17 15:20:46Z

7

You may create a generic method:

public <T> boolean checkPercent(List<T> associates) {
    ... your code ...
}

answered Jul 17, 2012 at 15:20

Howard

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Comments

Eng.Fouad · Accepted Answer · 2012-07-17 15:21:01Z

3

Use generics:

public <T> boolean checkPercent(List<T> associates){...}

answered Jul 17, 2012 at 15:21

Eng.Fouad

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Hans Z · Accepted Answer · 2012-07-17 15:36:04Z

2

The object-oriented approach would be to have BarStaff, Waiters, and KitchenStaff implement a Employee interface that has a method public int getPercentage().

public boolean checkPercent(List<? extends Employee> associates)
{
    foreach (Employee associate in associates)
    {
        int i = associate.getPercentage();
        // rest of code.
    }
}

edited Jul 17, 2012 at 15:36

answered Jul 17, 2012 at 15:24

Hans Z

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3 Comments

Eng.Fouad Over a year ago

I don't think this would work. See stackoverflow.com/questions/9810445/…

Hans Z Over a year ago

Extends and implements are different.

Eng.Fouad Over a year ago

This could work if it was an array, i.e Employee[] will accept BarStaff[]. However, I think the right way to do is List<? extends Employee>.

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