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public void createNode(int group){
DefaultMutableTreeNode root = null;
DefaultMutableTreeNode child[] = null;
List<String> list = new ArrayList<String>();
ExpressionBuilder builder=new ExpressionBuilder();
list = builder.getExpression(group,0);
root = new DefaultMutableTreeNode(groupString);
defaultTreeModel = new DefaultTreeModel(root);
for(int i=0; i<list.size();i++){
child[i] = new DefaultMutableTreeNode(list.get(i));
defaultTreeModel.insertNodeInto(child[i], root, i);
}
}
当我制作子数组时,它给了我空指针异常的错误。列表正确填充。当我添加字符串到子节点时发生错误
你能解释一下ExpressionBuilder对象是什么? – FearUs 2011-02-18 04:27:49