小问题~~~~~~~~~~会的请进~~~~~~~不会的也来看看

Question

监听树的节点是否改变 :-)tree.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener() {
            public void valueChanged(TreeSelectionEvent e) {
                tree_valueChanged(e);
            }
        });void tree_valueChanged(TreeSelectionEvent e) {
     // your code
}

Answer 1

cannot resolve symbol
symbol  : method addTreeSelectionListener (<anonymous javax.swing.event.TreeSelectionListener>)
location: class javax.swing.tree.DefaultMutableTreeNode
       Root.addTreeSelectionListener(new TreeSelectionListener()
           报错在黑点这里
我用默认的树节点为什么不能加树的改变监听？错在哪里了？

Answer 2

前面加入了包import javax.swing.event.*;
后面的取你的代码都没错