swing中Tree与滚动条用法实例分析

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：

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。