使用复选框使项目消失并从文本区域重新出现

Question

我正在尝试使用此程序，可以弹出一个窗格，其中包含宿舍“私人房间，有线电视，互联网”等选项。当用户单击每个复选框以表示他们想要该选项时。我希望选项从文本区域消失。

到目前为止，我已经得到了程序运行时出现的列表，以及附加输出的复选框，但它现在只删除了我点击的所有内容，然后在单击不同的框时添加选项。

我不确定我还能做些什么。 你能帮忙吗？

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class JDormRoom extends JFrame implements ItemListener {

    FlowLayout flow = new FlowLayout();
    JCheckBox privateRm = new JCheckBox("Private");
    JCheckBox internet = new JCheckBox("Internet");
    JCheckBox cable = new JCheckBox("Cable TV");
    JCheckBox microwave = new JCheckBox("Microwave");
    JCheckBox refrigerator = new JCheckBox("Refrigerator");
    JTextArea outArea = new JTextArea("Private Room" 
                            + "\nInternet" + "\nCable" 
                            +"\nMicrowave" + "\nRefrigerator", 30,30);
    String dormOption = "";
    String output = "";

    public JDormRoom() {
        super("Check Box");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel pane = new JPanel();
        pane.setLayout(flow);
        pane.add(privateRm);
        privateRm.addItemListener(this);
        pane.add(internet);
        internet.addItemListener(this);
        pane.add(cable);
        cable.addItemListener(this);
        pane.add(microwave);
        microwave.addItemListener(this);
        pane.add(refrigerator);
        refrigerator.addItemListener(this);
        pane.add(outArea);
        setContentPane(pane);
    }

    public static void main(String[] arguments) {
        JDormRoom dFrame = new JDormRoom();
        dFrame.setSize(450,300);
        dFrame.setVisible(true);
    }

    public void itemStateChanged(ItemEvent check) {
        Object source = check.getItem();
        int select = check.getStateChange();
        if (source == privateRm) {
            //int select = check.getStateChange();
            if (privateRm.isSelected())
                if(select == ItemEvent.SELECTED) {           
                    dormOption = "Private Room\n";
                    output += dormOption;
                }
        }
        if (source == internet) {
            //int select = check.getStateChange();
            if (internet.isSelected())
                if(select == ItemEvent.SELECTED) {           
                    dormOption = "Internet\n";
                    output += dormOption;
                }
        }
        if (source == cable) {
            //int select = check.getStateChange();
            if (cable.isSelected())
                if(select == ItemEvent.SELECTED) {           
                    dormOption = "Cable TV\n";
                    output += dormOption;
                }
        }
        if (source == microwave) {
            //int select = check.getStateChange();
            if (microwave.isSelected())
                if(select == ItemEvent.SELECTED) {           
                    dormOption = "Microwave\n";
                    output += dormOption;
                }
        }
        if (source == refrigerator) {
            //int select = check.getStateChange();
            if (refrigerator.isSelected())
                if(select == ItemEvent.SELECTED) {           
                    dormOption = "Refrigerator\n";
                    output += dormOption;
                }
        }
        outArea.setText(output);
    }
}