Java 一个JPanel中有多个JComboBox

我有一个带三个JComboBox的JPanel。以下是我编写的代码：

public class Main {

private static String pat_order;
private static String PS_selection;
private static String ovlp_selection;


public static void main(String args[]) throws FileNotFoundException, IOException {
    Date start_time = new Date();
    try {
        GridBagConstraints gbc = new GridBagConstraints();
        final JComboBox jc = new JComboBox();
        jc.addItem("ARR");
        jc.addItem("SRR");

        final JComboBox jc1 = new JComboBox();
        jc1.addItem("RR");
        jc1.addItem("IQC");

        final JComboBox jc2 = new JComboBox();
        jc2.addItem("YES");
        jc2.addItem("NO");

        JPanel myPanel = new JPanel(new GridBagLayout());
        myPanel.add(jc, gbc); 
        myPanel.add(jc1, gbc); 
        myPanel.add(jc2, gbc);

        jc.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent ie) {
                String order = (String) jc.getSelectedItem();
                pat_order = order;
            }
        });


        jc1.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent ie) {

                String PS_method = (String) jc1.getSelectedItem();
                PS_selection = PS_method;
            }
        });


        jc2.addItemListener(new ItemListener() {
            public void itemStateChanged(ItemEvent ie) {

                String ovlp_user = (String) jc2.getSelectedItem();
                ovlp_selection = ovlp_user;
            }
        });


        if (pat_order == "ARR") {
            Arrays.sort(patterns_array, new ColumnComparator(0));
        } else if (pat_order == "SRR") {
            Arrays.sort(patterns_array, new ColumnComparator(1));
        }

       if (PS_selection == "RR") {
           System.out.println("RR");
                        } else if (PS_selection == "IQC") {
                              System.out.println("IQC");
                            }
       if (ovlp_selection == "YES") {
            Overlap a = new Overlap(Xdisc, final_patterns, k, Yresid, Xresid, projectname, pat_order, PS_selection);
        }

   } catch (Exception e) {
        System.err.println("Error: " + e.getMessage());
    } finally {
    }
    }
    }

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问题是第一个JComboBox工作正常，但第二个和第三个却什么也没做。如果您能帮我解决这个问题，那就太好了。

您似乎在运行UI，就像它是一个控制台程序一样。UI不是这样工作的，它们响应事件。这些事件可能在任何时间以任何顺序发生

对话框是控制执行流程的好方法。它们将阻止代码，直到对话框关闭，从而允许您确定结果并采取适当的操作

查看更多详细信息

当你在那里的时候，你可能还想看一看，这将解释更多你需要理解的概念

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就像UI需要某种窗口才能显示在屏幕上一样

尝试添加

ActionListener

而不是

itemsListener
，我看不出您在哪里定义
gbc
？您是对的。为了避免混淆，我删除了一些代码行？