【高分求解】诡异问题：JComboBox可以下拉，但没有下拉箭头

时间：2021-04-01 18:06:36
private void jbInit()

    {

        this.getContentPane().add(pnlMain);

        pnlMain.setLayout(borderLayout1);

        pnlMain.setBorder(BorderFactory.createEmptyBorder(12, 12, 12, 12));

        pnlMain.add(pnlCenter, BorderLayout.CENTER);

        pnlMain.add(pnlSouth, BorderLayout.SOUTH);

        pnlSouth.setLayout(flowLayout1);

        flowLayout1.setAlignment(FlowLayout.RIGHT);

        pnlSouth.add(btnRefresh);

        pnlSouth.add(btnSet);

        pnlSouth.add(btnClose);

        pnlSouth.add(btnHelp);

        btnRefresh.setText("刷新");

        btnRefresh.setSize(new Dimension(83, 23));

        btnRefresh.setMnemonic('R');

        btnRefresh.addActionListener(new java.awt.event.ActionListener()

        {

            public void actionPerformed(ActionEvent e)

            {

                btnRefresh_actionPerformed(e);

            }

        });

        btnSet.setText("设置");

        btnSet.setSize(new Dimension(83, 23));

        btnSet.setMnemonic('S');

        btnSet.addActionListener(new java.awt.event.ActionListener()

        {

            public void actionPerformed(ActionEvent e)

            {

                btnSet_actionPerformed(e);

            }

        });

        btnClose.setText("关闭");

        btnClose.setSize(new Dimension(83, 23));

        btnClose.setMnemonic('C');

        btnClose.addActionListener(new java.awt.event.ActionListener()

        {

            public void actionPerformed(ActionEvent e)

            {

                btnClose_actionPerformed(e);

            }

        });

        btnHelp.setText("帮助");

        btnHelp.setSize(new Dimension(83, 23));

        btnHelp.setMnemonic('H');

        btnHelp.addActionListener(new java.awt.event.ActionListener()

        {

            public void actionPerformed(ActionEvent e)

            {

                btnHelp_actionPerformed(e);

            }

        });

        

        pnlCenter.setLayout(borderLayout2);

        pnlCenter.setBorder(border1);

        pnlCenter.add(pnlCNorth, BorderLayout.NORTH);

        pnlCenter.add(pnlCCenter, BorderLayout.CENTER);

        pnlCenter.add(pnlCSouth, BorderLayout.SOUTH);

        pnlCNorth.setBorder(border2);

        pnlCNorth.setLayout(gridBagLayout1);

        lblZxAnMldAdminStatus.setText("MLD协议使能");

        lblZxAnMldAging.setText("老化时间");

        lblZxAnMldWorkingMode.setText("工作模式");

        lblZxAnMldMcastInAllVlan.setText("跨VLAN使能");

        lblZxAnMldBandwidthCtrl.setText("带宽使能");

        lblZxAnMldHostTrackOnOff.setText("主机跟踪使能");

        lblZxAnMldGeneralLeaveGrpAddr.setText("通用离开组播地址");

        lblZxAnMldGroupThreshold.setText("最大组播组门限");

        pnlCNorth.add(lblZxAnMldAdminStatus, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(cmbZxAnMldAdminStatus, new GridBagConstraints(1, 0, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(lblZxAnMldAging, new GridBagConstraints(2, 0, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(txtZxAnMldAging, new GridBagConstraints(3, 0, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(lblZxAnMldWorkingMode, new GridBagConstraints(0, 1, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(cmbZxAnMldWorkingMode, new GridBagConstraints(1, 1, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(lblZxAnMldMcastInAllVlan, new GridBagConstraints(2, 1, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(cmbZxAnMldMcastInAllVlan, new GridBagConstraints(3, 1, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(lblZxAnMldBandwidthCtrl, new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(cmbZxAnMldBandwidthCtrl, new GridBagConstraints(1, 2, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(lblZxAnMldHostTrackOnOff, new GridBagConstraints(2, 2, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(cmbZxAnMldHostTrackOnOff, new GridBagConstraints(3, 2, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(lblZxAnMldGeneralLeaveGrpAddr, new GridBagConstraints(0, 3, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(txtZxAnMldGeneralLeaveGrpAddr, new GridBagConstraints(1, 3, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(lblZxAnMldGroupThreshold, new GridBagConstraints(2, 3, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCNorth.add(txtZxAnMldGroupThreshold, new GridBagConstraints(3, 3, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));


        pnlCCenter.setBorder(border3);

        pnlCCenter.setLayout(gridBagLayout2);

        lblZxAnMldRobustnessVariable.setText("健壮性变量");

        lblZxAnMldQueryInterval.setText("查询间隔");

        lblZxAnMldQueryMaxResponseTime.setText("查询最大响应时间");

        lblZxAnMldLastMembQueryInterval.setText("最后成员查询间隔");

        lblZxAnMldLastMembQueryCount.setText("最后成员查询记数");

        lblZxAnMldUnsolicitedReportInterv.setText("主动报告间隔时间");

        pnlCCenter.add(lblZxAnMldRobustnessVariable, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(cmbZxAnMldRobustnessVariable, new GridBagConstraints(1, 0, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(lblZxAnMldQueryInterval, new GridBagConstraints(2, 0, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(txtZxAnMldQueryInterval, new GridBagConstraints(3, 0, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(lblZxAnMldQueryMaxResponseTime, new GridBagConstraints(0, 1, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(txtZxAnMldQueryMaxResponseTime, new GridBagConstraints(1, 1, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(lblZxAnMldLastMembQueryInterval, new GridBagConstraints(2, 1, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(txtZxAnMldLastMembQueryInterval, new GridBagConstraints(3, 1, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(lblZxAnMldLastMembQueryCount, new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(cmbZxAnMldLastMembQueryCount, new GridBagConstraints(1, 2, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(lblZxAnMldUnsolicitedReportInterv, new GridBagConstraints(2, 2, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCCenter.add(txtZxAnMldUnsolicitedReportInterv, new GridBagConstraints(3, 2, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCSouth.setBorder(border4);

        pnlCSouth.setLayout(gridBagLayout3);

        lblZxAnMcastIpv6CdrServerIP.setText("接收服务器地址");

        lblNull1.setText("     ");

        lblNull2.setText("     ");

        pnlCSouth.add(lblZxAnMcastIpv6CdrServerIP, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCSouth.add(txtZxAnMcastIpv6CdrServerIP, new GridBagConstraints(1, 0, 1, 1, 1.0, 0.0

            , GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(6, 6, 6, 6), 0, 0));

        pnlCSouth.add(lblNull1,  new GridBagConstraints(2, 0, 1, 1, 1.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

        pnlCSouth.add(lblNull2,  new GridBagConstraints(3, 0, 1, 1, 0.0, 0.0

            , GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(6, 6, 6, 6), 0, 0));

    }


这是构造GUI的方法~布局时GridBagConstraints

13 个解决方案

#1

应该是少设定了某个属性

#2

是指JComboBox的属性 还是布局上的属性

我发现不在该布局内的JComboBox是好的~

#3

你最好把你的pnlCNorth，gridBagLayout1还有comboBox的初期化代码贴出来看看

#4

JPanel pnlCNorth = new JPanel();

GridBagLayout gridBagLayout1 = new GridBagLayout();

JComboBox cmbZxAnMldAdminStatus = new JComboBox();


#5

求解呀

#6

dingyixia

#7

引用 4 楼 grubby4k 的回复:
JPanel pnlCNorth = new JPanel();

 GridBagLayout gridBagLayout1 = new GridBagLayout();

 JComboBox cmbZxAnMldAdminStatus = new JComboBox();


这是你初期化代码，没有设置任何属性是么？

#8

该回复于2009-11-13 08:56:28被版主删除

#9

曾经有过布局管理器布局导致空间无法正常显示 和只显示一部分的 
没有显示更加难找 显示不完全就肯定是 被布局管理器给郁闷了 而且很有可能是流布局管理器的问题

#10

我也能定位是布局管理器的问题，但是如何解决呢?

#11

栓查清空的方法,看用的是不是removeAll,如果是的话就替换成removeAllItems

#12

该回复于2009-12-21 20:04:30被版主删除

#13

引用 11 楼 a3880012 的回复:
栓查清空的方法,看用的是不是removeAll,如果是的话就替换成removeAllItems

嗯，这个必须得改

#1

应该是少设定了某个属性

#2

是指JComboBox的属性 还是布局上的属性

我发现不在该布局内的JComboBox是好的~

#3

你最好把你的pnlCNorth，gridBagLayout1还有comboBox的初期化代码贴出来看看

#4

JPanel pnlCNorth = new JPanel();

GridBagLayout gridBagLayout1 = new GridBagLayout();

JComboBox cmbZxAnMldAdminStatus = new JComboBox();


#5

求解呀

#6

dingyixia

#7

引用 4 楼 grubby4k 的回复:
JPanel pnlCNorth = new JPanel();

 GridBagLayout gridBagLayout1 = new GridBagLayout();

 JComboBox cmbZxAnMldAdminStatus = new JComboBox();


这是你初期化代码，没有设置任何属性是么？

#8

该回复于2009-11-13 08:56:28被版主删除

#9

曾经有过布局管理器布局导致空间无法正常显示 和只显示一部分的 
没有显示更加难找 显示不完全就肯定是 被布局管理器给郁闷了 而且很有可能是流布局管理器的问题

#10

我也能定位是布局管理器的问题，但是如何解决呢?

#11

栓查清空的方法,看用的是不是removeAll,如果是的话就替换成removeAllItems

#12

该回复于2009-12-21 20:04:30被版主删除

#13

引用 11 楼 a3880012 的回复:
栓查清空的方法,看用的是不是removeAll,如果是的话就替换成removeAllItems

嗯，这个必须得改
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