Java更新列表模型字符串

Question

I have a JList that uses a list model to add strings of text to the JList . I am having trouble figuring out how to update a selected listModel . I am able to select the listModel String (I have verified that what ever I select returns correctly) but I am unable to figure out how to update the listModel string I select. Any help with this would be greatly appreciated. Is there a updateElement(variable) or something I could use to accomplish this?

    String string1 = "hello";
    String string2 = "goodbye";
        String myItem = jlst.getSelectedValue();
    // myItem is the string returned
        listModel.addElement(string1 + string2);
// adds a new element is there anyway to update myItem so string1 and string 2 become apart of the myItem string ?

Answer 1

Make sure you are using a DefaultListModel .

/* Create model */        
DefaultListModel<String> dlm = new DefaultListModel<>();

/* Add elements */ 
dlm.addElement("test");
dlm.addElement("test2");

/* JList to use the model */ 
JList<String> list = new JList<>(dlm);

/* Update an element */
dlm.set(1, "test3");

Answer 2

I am having trouble figuring out how to update a selected listmodel.

Read the section from the Swing tutorial on How to Use Lists . It has a working example that shows you how to dynamically add/remove elements from the DefaultListModel based on a user interaction with the GUI.