JTree的各项值变化了以后,如何让它重画?

Question

使用 model，他自动更新的！

Answer 1

updateUI();
repaint();
好象是，都试试看看

Answer 2

我使用updateUI()来进行更新，结果怎么出现下列错误，但是还能继续运行。java.lang.NullPointerException
at javax.swing.plaf.basic.BasicTreeUI.paintRow(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI.paint(Unknown Source)
at javax.swing.plaf.metal.MetalTreeUI.paint(Unknown Source)
at javax.swing.plaf.ComponentUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintWithOffscreenBuffer(Unknown Source)
at javax.swing.JComponent.paintDoubleBuffered(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

Answer 3

改变了treemodel，数据就更新了。

Answer 4

我查了相关资料，发现大家都不推荐使用updateUI，所以我上面的问题也改用如下代码来解决：m_model.nodeStructureChanged(mtn);
m_tree.expandPath(visiblePath);