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Java GUI:将JPanel添加进JScrollPane
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Java GUI:将JPanel添加进JScrollPane
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實現的目標:
因為在滾動框中含有很多個Java GUI 組件,因此這里采用JPanel面板包住這些組件,在用JScrollPane實現滾動
問題1:布局揉在一起
JPanel有自己默認的布局方式,因此在這里我們要自己設置流式布局
jPanel_qanda.setLayout(null);問題2:滾動條未生效
剛開始的時候我是直接設置JPanel的大小 setSize(int?width, int?height) 不管設置多大,都沒有滾動條
最后百度,看到了一個博客:https://www.cnblogs.com/tianguook/archive/2012/03/21/2410807.html
jPanel_qanda.setPreferredSize(new Dimension(800,1000));滾動條出現!
問題3:組件不顯示
PS:今天在寫GUI的時候,因為粗心,出現了一個問題:
容器add組件后,運行時不出現,當鼠標移動到目標位置時,組件才浮現出來
原因:setBounds 寫在了 add方法的前面去了
貼一下所有代碼,自用的,有點亂:
public static void qanda(){final JFrame frame=menu(new JFrame());user.setNickname("zs");user.setRole(1);List<Qanda> questions=qandaDao.getQuestions();JButton jButton_ask=new JButton("Ask Question");frame.add(jButton_ask);jButton_ask.setBounds(440, 200, 120, 30);jButton_ask.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stub }});JPanel jPanel_qanda=new JPanel();jPanel_qanda.setPreferredSize(new Dimension(800,150*questions.size()));jPanel_qanda.setLayout(null);for (int i = 0; i < questions.size(); i++) {String name=questions.get(i).getName();String time=questions.get(i).getTime();String content=questions.get(i).getContent();JLabel jLabel_name=new JLabel("Name:"+name);jPanel_qanda.add(jLabel_name);jLabel_name.setBounds(20, 20+150*i, 60, 20);JLabel jLabel_time=new JLabel("Time:"+time);jPanel_qanda.add(jLabel_time);jLabel_time.setBounds(220, 20+150*i, 160, 20);JButton jButton_answer=new JButton("Answer");jPanel_qanda.add(jButton_answer);jButton_answer.setBounds(420, 20+150*i, 120, 30);jButton_answer.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stub }});JButton jButton_check=new JButton("Check");jPanel_qanda.add(jButton_check);jButton_check.setBounds(620, 20+150*i, 120, 30);jButton_check.addActionListener(new ActionListener() {@Overridepublic void actionPerformed(ActionEvent e) {// TODO Auto-generated method stub }});JTextArea jTextArea_content=new JTextArea(content);jPanel_qanda.add(jTextArea_content);jTextArea_content.setBounds(20, 50+150*i, 740, 80);}JScrollPane jScrollPane_userInfo=new JScrollPane(jPanel_qanda,ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);frame.add(jScrollPane_userInfo);jScrollPane_userInfo.setBounds(100, 250, 800, 200);jScrollPane_userInfo.setFont(new Font("Dialog", 0, 20));}/*** 用戶信息*/public static void userInfo(){JFrame frame=new JFrame();user.setNickname("zs");frame.setSize(1000,600);frame.setVisible(true);frame.setResizable(false);frame.setLocation((Toolkit.getDefaultToolkit().getScreenSize().width-400)/2,(Toolkit.getDefaultToolkit().getScreenSize().height-320)/2);frame.setTitle("Notice");frame.setLayout(null);frame=menu(frame);List<User> users=userDao.getUsers();String[][] userInfos=new String[users.size()][4];for(int i=0;i<users.size();i++){userInfos[i][0]=users.get(i).getNickname();userInfos[i][1]=users.get(i).getAccount();userInfos[i][2]=users.get(i).getEmail();if(users.get(i).getRole()==0){userInfos[i][3]="Student";}else{userInfos[i][3]="Teacher";}}String[] header=new String[]{"Name","Account","Email","Role"};JTable jTable_userInfo=new JTable(userInfos,header);JScrollPane jScrollPane_userInfo=new JScrollPane(jTable_userInfo,ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_ALWAYS);frame.add(jScrollPane_userInfo);jScrollPane_userInfo.setBounds(100, 200, 800, 200);jScrollPane_userInfo.setFont(new Font("Dialog", 0, 20));}?
轉載于:https://www.cnblogs.com/fdzang/p/9601010.html
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