本文实例讲述了swing中Tree与滚动条用法。分享给大家供大家参考。具体如下:
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import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.tree.*; public class test extends JApplet{ JTree tree; JTextField jtf; public void init(){ Container contentPane = getContentPane(); contentPane.setLayout( new BorderLayout()); DefaultMutableTreeNode top = new DefaultMutableTreeNode( "Options" ); DefaultMutableTreeNode a = new DefaultMutableTreeNode( "A" ); top.add(a); DefaultMutableTreeNode a1 = new DefaultMutableTreeNode( "A1" ); a.add(a1); DefaultMutableTreeNode a2 = new DefaultMutableTreeNode( "A2" ); a.add(a2); DefaultMutableTreeNode b = new DefaultMutableTreeNode( "B" ); top.add(b); DefaultMutableTreeNode b1 = new DefaultMutableTreeNode( "B1" ); b.add(b1); DefaultMutableTreeNode b2 = new DefaultMutableTreeNode( "B2" ); b.add(b2); tree = new JTree(top); int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED; int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED; JScrollPane jsp = new JScrollPane(tree,v,h); contentPane.add(jsp, BorderLayout.CENTER); jtf = new JTextField( "" , 20 ); contentPane.add(jtf, BorderLayout.SOUTH); tree.addMouseListener( new MouseAdapter(){ public void mouseClicked(MouseEvent me){ doMouseclicked(me); } }); } void doMouseclicked(MouseEvent me){ TreePath tp = tree.getPathForLocation(me.getX(), me.getY()); if (tp != null ) jtf.setText(tp.toString()); else jtf.setText( "" ); } } |
希望本文所述对大家的java程序设计有所帮助。