HashMap into DefaultListModel

问题

Here's the code that I have:

HashMap<String, String> inst1 = new HashMap(instructorIO.getInstructors());
instListModel = new DefaultListModel<String>(inst1.values());

I get errors:

DepartmentProject.java:69: error: constructor DefaultListModel in class DefaultListModel<E> cannot be applied to given types;
    required: no arguments
    found: Collection<String>
    reason: actual and formal argument lists differ in length
    where E is a type-variable:
    E extends Object declared in class DefaultListModel

Can anyone help me with this?

回答1:

DefaultListModel only has a constructor that takes no arguments; you can't pass the values you want as a constructor arg. You will have to create the DefaultListModel and then populate it afterward, for example:

HashMap<String, String> inst1 = new HashMap(instructorIO.getInstructors());
instListModel = new DefaultListModel<String>();
for (String value : inst1.values())
{
    instListModel.addElement(value);
}

来源：https://stackoverflow.com/questions/9474479/hashmap-into-defaultlistmodel