News - Swing-Generics (OpenJDK): JList patch commited

Great news from the OpenJDK swing-generics project: my patch to "generify" JList, along with AbstractListModel, DefaultListCellRenderer, DefaultListModel, ListCellRenderer and ListModel, has been commited to the OpenJDK/ Swing repository!

This patch helps writing more stable code.

Eg. instead of writing something like:

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1. DefaultListModel model = new DefaultListModel();  
2. model.addElement("test");  
3. JList list = new JList(model);  
4. ...  
5. String value = (String) list.getSelectedValue(); // unchecked cast  
6. Foo foo = (Foo) list.getSelectedValue(); // cast will fail at runtime  

<br />DefaultListModel model = new DefaultListModel();<br />model.addElement("test");<br />JList list = new JList(model);<br />...<br />String value = (String) list.getSelectedValue(); // unchecked cast<br />Foo foo = (Foo) list.getSelectedValue(); // cast will fail at runtime<br />

with this patch you can write now:

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1. DefaultListModel<String> model = new DefaultListModel<String>();  
2. model.addElement("test");  
3. JList<String> list = new JList<String>(model);  
4. ...  
5. String value = list.getSelectedValue();  
6. Foo foo = list.getSelectedValue(); // compile time error  

<br />DefaultListModel<String> model = new DefaultListModel<String>();<br />model.addElement("test");<br />JList<String> list = new JList<String>(model);<br />...<br />String value = list.getSelectedValue();<br />Foo foo = list.getSelectedValue(); // compile time error<br />

Note that:
JList.getSelectedValues(): Object[] has been deprecated and replaced with:
JList.getSelectedValuesList(): List<E>

Have a look at the jtreg tests to see more examples.

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