将 int 更改为整数时 Java 测试失败

Question

我有方法electCouncillor从数组 CouncillorsSet 中获取某个议员，将其放在某个balcony上队列，从中获取额外的议员 balcony并将其放回 CouncillorSet ，为了确定将从数组中取出哪位议员，我有私有(private) int 字段 CouncillorNumber ，然后我意识到我不能使用 int 因为每次我使用该方法时我都必须重置 CouncillorNumber value 和 int 不允许为 null(如果我输入 0，它将始终使用数组中的第一个议员)，所以我决定将其更改为整数，但由于某种原因测试失败了，我不明白为什么。

public class Player {
    private int id;
    private int councillorNumber;

    public void electCouncillor(Region region,GameBoard gameBoard){
//Gets a certain councillor from the array CouncillorSet
        Councillor councillor = gameBoard.getCouncillorsSet().get(councillorNumber);
//Adds that councillor to the queue Balcony
        region.getBalcony().add(councillor);
//Sets the councillor on top of the Balcony in the CouncillorSet
        gameBoard.setCouncillor(region.getBalcony().element());
//Removes the councillor on top of the balcony
        region.getBalcony().remove();
//Removes the councillor from CouncillorSet that was added to the balcony
        gameBoard.getCouncillorsSet().remove(councillorNumber);


    }
    public int getCouncillorNumber() {
        return councillorNumber;
    }
    public void setCouncillorNumber(int councillorNumber) {
        this.councillorNumber = councillorNumber;
    }

}

这是测试

@Test
    public void testElectCouncillor(){
        Player player = new Player(1);
        GameBoard gameBoard = new GameBoard();
//First i create 6 councillors to be used in the test
        Councillor councillor1 = new Councillor();
        Councillor councillor2 = new Councillor();
        Councillor councillor3 = new Councillor();
        Councillor councillor4 = new Councillor();
        Councillor councillor5 = new Councillor();
        Councillor councillor6 = new Councillor();
        councillor1.setColor(Color.BLACK);
        councillor2.setColor(Color.BLUE);
        councillor3.setColor(Color.ORANGE);
        councillor4.setColor(Color.PURPLE);
        councillor5.setColor(Color.WHITE);
        councillor6.setColor(Color.PINK);
//Then i add the first 4 councillors to a balcony
        Region region = gameBoard.getRegionCoast();
        Queue<Councillor> balcony = region.getBalcony();
        balcony.add(councillor1);
        balcony.add(councillor2);
        balcony.add(councillor3);
        balcony.add(councillor4);
//The i add the remaining two to the CouncillorSet of the GameBoard
        gameBoard.setCouncillorSet(new ArrayList<Councillor>());
        gameBoard.getCouncillorsSet().add(councillor5);
        gameBoard.getCouncillorsSet().add(councillor6);
//This gets the first element from CouncillorSet, which in this case is the councillor5 color white
        player.setCouncillorNumber(0);
        player.electCouncillor(region,gameBoard);
//After doing the method first i verify that the element in top of the queue is 
//now the councillor Blue
        assertEquals(Color.BLUE,region.getBalcony().element().getColor());
//Then i verify that the elements 0 and 1 from the CouncillorSet are the
//Pink and Black councillors respectively (before the method the pink
//councillor was the element 1)
        assertEquals(Color.BLACK,gameBoard.getCouncillorsSet().get(1).getColor());
        assertEquals(Color.PINK,gameBoard.getCouncillorsSet().get(0).getColor());
}

这是使用整数而不是 int 的方法的版本

public class Player {
    private int id;
    private Integer councillorNumber;

    public void electCouncillor(Region region,GameBoard gameBoard){
        Councillor councillor = gameBoard.getCouncillorsSet().get(councillorNumber);
        region.getBalcony().add(councillor);
        gameBoard.setCouncillor(region.getBalcony().element());
        region.getBalcony().remove();
        gameBoard.getCouncillorsSet().remove(councillorNumber);


    }
    public Integer getCouncillorNumber() {
        return councillorNumber;
    }
    public void setCouncillorNumber(Integer councillorNumber) {
        this.councillorNumber = councillorNumber;
    }

}

运行相同测试时出现的错误是 expected <BLACK>, but was <PINK>

Answer 1

取自API，根据参数类型有不同的方法。第一个删除指定索引中的元素，而第二个删除元素本身，无论索引如何

remove(int index)Removes the element at the specified position in

remove(Object o) Removes the first occurrence ofthe specified element from this list, if it is present.

编辑添加示例:

列表 = {1, 4, 5, 6, 9}

With int => remove(4)(删除索引为4的数字)结果:列表 = {1, 4, 5, 6}

With Integer => remove(4)(删除值为 4 的元素)结果:列表 = {1, 5, 6, 9}