在树中插入好几类Object,如User、Unit、OU、Admin等，全都继承自Object。现通过单击事件来取出它们相应的内容，所有要判断所单击的节点的类型是什么，比如User，或者Unit，问在用DefaultMutableTreeNode的getUserObject方法取出对象后，应如何判断它是哪一类型？如 ...

Over the ages, drag and drop with the Swing component set has changed considerably. Early versions had a basic API in the java.awt.dnd package (with support from java.awt.datatransfer), but you had to ...

I'm working on a program where I want to show a bunch of categories and sub-categories using one of those menu trees. I'm using NetBeans to do most of the GUI grunt ...

Adding drag-and-drop support to JTrees has been covered already in Java Tip 97: Add Drag and Drop to Your JTrees. I encourage you to read that tip first to get a good understanding of the ...