Question

所以我的代码遇到了问题。

首先，我有一个ArrayList添加了对象：

cellRoomObjects = new ArrayList<>();
RoomObjects door = new RoomObjects("Door" , 1 , true);
RoomObjects oilLamp = new RoomObjects("Oil lamp", 2 , true);
RoomObjects chest = new RoomObjects("Chest" , 3 , true);
RoomObjects wallCarving = new RoomObjects("Wall Carving", 4 , false);
cellRoomObjects.add(door);
cellRoomObjects.add(oilLamp);
cellRoomObjects.add(chest);
cellRoomObjects.add(wallCarving);

其次，我得到一个JComboBox，它将String[]数组作为输入：

String[] objectStrings = { "Bookcase", "Chest", "Door", "Safe",
            "Comfortable chair" };

JComboBox objectList = new JComboBox(objectStrings);

现在我希望我的JComboBox显示我{{1}的每个对象的名称（"Door"，"Oil Lamp"，"Chest"和"Wall Carving"）字符串，但我不知道该怎么做。有什么建议吗？

Answer 1

制作

cellRoomObjects = new Vector();

覆盖RoomObjects的toString（）方法，只返回名称（或标题或任何字符串字段）

创建JComboBox（cellRoomObjects）;

Answer 2

您需要做的是获取每个字符串并将它们存储在数组中：例如：

String[] myNames=new String[cellRoomObjects.size()];
int i= 0;
for(RoomObjects r : cellRoomObjects ){
   myName[i]=r.getName() //assuming there is a method that gets name in RoomObjects that returns  the string u want
   i++
}

Answer 3

我只是喜欢命名变量，你可以重命名，

public class CellRoomObject {

    String itemName;
    int itemNumber;
    boolean ok;

    public CellRoomObject(String itemName, int itemNumber, boolean ok) {
        this.itemName = itemName;
        this.itemNumber = itemNumber;
        this.ok = ok;
    }

    @Override
    public String toString() {
        return this.itemName;
    }


}

现在你的ArrayList

// create a JCOMBOBOx named  say myCombobox

公共类MyFrame扩展了JFrame {

 public MyFrame() {

       setTitle("example");
       setSize(300, 200);
       setLocationRelativeTo(null);
       setDefaultCloseOperation(EXIT_ON_CLOSE);  
       JComboBox myBox=new JComboBox();
       ArrayList<CellRoomObject> cellRoomObjects =new ArrayList<CellRoomObject>();
        CellRoomObject c1=new CellRoomObject("Door" , 1 , true);
         CellRoomObject c2=new CellRoomObject("Oil lamp", 2 , true);
          CellRoomObject c3=new CellRoomObject("Chest" , 3 , true);
          cellRoomObjects.add(c1);
           cellRoomObjects.add(c2);
           cellRoomObjects.add(c3);
        DefaultComboBoxModel dcbm =new DefaultComboBoxModel(cellRoomObjects.toArray());
        myBox.setModel(dcbm);
        this.add(myBox);
        setVisible(true);
    }


    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                MyFrame ex = new MyFrame();
                ex.setVisible(true);
            }
        });
    }
}

试试这个（做必要的进口）

在JComboBox </object>中的ArrayList <object>中显示对象的字符串

3 个答案: