嘟嘟

先建一個菜單對象,處理JTree控件鼠標事件,然后將菜單顯示出來
JPopupMenu popup = new JPopupMenu();
JMenuItem modify = new JMenuItem("modify");
 modify.setActionCommand("modify");
 modify.addActionListener(this);
 popup.add(modify);

1: 左鍵選中然后再右鍵去操作
tree.addMouseListener(new MouseAdapter() {
   public void mousePressed(MouseEvent e) {
    if (e.getButton() == e.BUTTON3) {  //BUTTON3是鼠標右鍵
      DefaultMutableTreeNode node =  (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
      pmn.show(e.getComponent(),e.getX(),e.getY());
    }
   }
  });

2: 直接右擊
public void jTree1_mousePressed(MouseEvent e) {
    TreePath tp=tree.getPathForLocation(e.getX(),e.getY());
   if (tp != null) {
          tree.setSelectionPath(tp);
          DefaultMutableTreeNode node =  (DefaultMutableTreeNode)tp.getLastPathComponent()
   } 
   pmn.show(e.getComponent(),e.getX(),e.getY());
    }
   }
  });