如何創建一個延遲加載的JTree

Question

tree.addTreeExpansionListener(new TreeExpansionListener() { 
     @Override 
     public void treeExpanded(TreeExpansionEvent event) { 
      DefaultMutableTreeNode node = (DefaultMutableTreeNode) event 
          .getPath().getLastPathComponent(); 
      node.removeAllChildren(); 
      //System.out.println(node.getChildCount()); 
      child = new DefaultMutableTreeNode("new node"); 
      node.add(child);; 

      frame.doLayout(); 
      frame.repaint(); 

     } 

     @Override 
     public void treeCollapsed(TreeExpansionEvent event) { 
      // TODO Auto-generated method stub 

     } 
    }); 

Answer 1

你可以從這個抽象類inherhit： AbstractLazyTreeNode.java