I need help with some java code?
me again. I need some help with some more extra credit to pull my grade up. The teacher gave me this code
import java.util.ArrayList;
public class ScoreSet
{
private ArrayList <Integer> scores;
public ScoreSet ( )
{
scores = new ArrayList<Integer> ( );
}
public void add (int score)
{
Integer wrapper = new Integer (score);
scores.add (wrapper);
}
public double averageWithoutLowest2 ( )
{
. . .
}
private ArrayList <Integer> scores;
}
she wants me to change the add method so that it uses auto-boxing instead of explicitly creating a wrapper.
i dunno what that means or how to do it. Please help me. Thank you.
I need help with some java code?
In java, a whole number, or an integer, can be represented in one of two different ways. 1) as a primitive (which is faster), or 2) as an object wrapper which is used when a variable has to be an object and can't be a primitive.
Here's how the add method can be made with auto-boxing:
public void add (int score) {
scores.add (score);
}
Notice that the method, add() takes a primitive int as a parameter and passes it into the ArrayList called scores, which puts the Integer at the end the array list as a new object. The conversion from int to Integer is done automatically. This is "auto-boxing".
I think that the source code that you have has some typos in it. I think that you need to remove the ellipse:
...
and I believe that it is an error to declare the variable called "scores" twice. That is, the following line of code should only be in once:
private ArrayList <Integer> scores;
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