java swing jtree簡單界面使用

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import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeSelectionModel;

public class Tree extends JFrame
{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	JTree tree = new JTree();
	

	private void setTree() {
		// TODO Auto-generated method stub
		DefaultMutableTreeNode root = null;
		DefaultMutableTreeNode  leaf1,leaf2;
		root = new DefaultMutableTreeNode("work");

		DefaultMutableTreeNode nodeppt=new DefaultMutableTreeNode("ppt");
		root.add(nodeppt);
		leaf1=new  DefaultMutableTreeNode("6_10.ppt");
		leaf2=new  DefaultMutableTreeNode("6_10.vsd");
		nodeppt.add(leaf1);
		nodeppt.add(leaf2);
		tree.getSelectionModel().setSelectionMode( TreeSelectionModel.SINGLE_TREE_SELECTION );
		tree.setShowsRootHandles( true );
        //樹不可以編輯
	    tree.setEditable( false ); 
	    tree.setModel(new DefaultTreeModel(root));
	    getContentPane().add(tree);
	}

public static void main(String[] args) 
{
	Tree t = new Tree();
	t.setSize(300,300);
	t.setTree();
	t.show();
    }



}

tree.getSelectionModel().setSelectionMode( TreeSelectionModel.SINGLE_TREE_SELECTION );

// 設置同時只能有一個節點被選中，這是爲了確定唯一路徑’

tree.setShowsRootHandles( true );

//設置是否顯示根節點的“展開/摺疊”圖標,默認是false