[英]Java JList doesn't show elements
I have a JList which is supposed to display a list of school tests. 我有一个JList,它应该显示学校考试的列表。 When I add values to this list in Swing Designer then it displays everything correctly, but when I try to display my own data it still shows the values initialized in Swing Designer. 当我在Swing Designer中向此列表添加值时,它会正确显示所有内容,但是当我尝试显示自己的数据时,它仍显示在Swing Designer中初始化的值。 How to display my own set of data in JList? 如何在JList中显示我自己的数据集? My initial update in code: 我最初的代码更新:
public void updateFrame(MainFrame mainFrame)
{
DefaultListModel<Test> listModel = new DefaultListModel<Test>();
for(int i = 0 ; i < this.getTestList().size() ; i++)
listModel.add(i, this.getTestList().get(i));
JList<Test> currList = new JList<>(listModel);
currList.setVisible(true);
mainFrame.setList(currList);
mainFrame.getList().setVisible(true);
}
Also my ListListener doesn't activate at any moment, but it's another problem, maybe easier to figure out after the first one. 另外,我的ListListener随时都不会激活,但这是另一个问题,也许在第一个问题之后比较容易解决。
class ListListener implements ListSelectionListener {
@Override
public void valueChanged(ListSelectionEvent e) {
DefaultListModel<Test> listModel = new DefaultListModel<Test>();
for(Test test : model.getTestList())
listModel.addElement(test);
JList<Test> currList = new JList<Test>(listModel);
mainFrame.setList(currList);
}
}
Again, don't swap components but rather models, something like: 同样,不要交换组件,而要交换模型,例如:
public void updateFrame(MainFrame mainFrame) {
DefaultListModel<Test> listModel = new DefaultListModel<Test>();
for(int i = 0 ; i < this.getTestList().size() ; i++) {
listModel.add(i, this.getTestList().get(i));
}
// ***** get rid of this *****
// JList<Test> currList = new JList<>(listModel);
// currList.setVisible(true);
// mainFrame.setList(currList);
// ***** and instead simply do this *****
mainFrame.getList().setModel(listModel);
}
If this doesn't work, then yes, create and post your MCVE 如果这不起作用,那么可以,创建并发布您的MCVE
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