Java GUI:将JPanel添加进JScrollPane
标签:log action www else 问题 idt 用户信息 ide role
实现的目标:
因为在滚动框中含有很多个Java GUI 组件,因此这里采用JPanel面板包住这些组件,在用JScrollPane实现滚动
问题1:布局揉在一起
JPanel有自己默认的布局方式,因此在这里我们要自己设置流式布局
jPanel_qanda.setLayout(null);
问题2:滚动条未生效
刚开始的时候我是直接设置JPanel的大小 setSize(int width, int height) 不管设置多大,都没有滚动条
最后百度,看到了一个博客:https://www.cnblogs.com/tianguook/archive/2012/03/21/2410807.html
jPanel_qanda.setPreferredSize(new Dimension(800,1000));
滚动条出现!
问题3:组件不显示
PS:今天在写GUI的时候,因为粗心,出现了一个问题:
容器add组件后,运行时不出现,当鼠标移动到目标位置时,组件才浮现出来
原因:setBounds 写在了 add方法的前面去了
贴一下所有代码,自用的,有点乱:
public static void qanda(){
final JFrame frame=menu(new JFrame());
user.setNickname("zs");
user.setRole(1);
List 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() {
@Override
public 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 ) {
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() {
@Override
public 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() {
@Override
public 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));
}
/**
* 用户信息
*/
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 users=userDao.getUsers();
String[][] userInfos=new String[users.size()][4];
for(int i=0;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));
}
Java GUI:将JPanel添加进JScrollPane
标签:log action www else 问题 idt 用户信息 ide role
原文地址:https://www.cnblogs.com/fdzang/p/9601010.html
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