package com.hunauimport scala.swing.SimpleSwingApplication  import scala.swing.FileChooser  import java.io.File  import scala.swing.MainFrame  import scala.swing.FlowPanel  import scala.swing.Button  import scala.swing.Label  import scala.swing.event.ButtonClicked      object test extends SimpleSwingApplication {        val fileChooser = new FileChooser(new File(".")) //文件对话框    fileChooser.title = "选择文件"    val button = new Button{      text = "从本地选择文件"    }    val label = new Label {      text = "还未选择文件."    }    val mainPanel = new FlowPanel{      contents += button      contents += label    }        def top = new MainFrame{      title = "Scala GUI编程 !!!"      contents = mainPanel            listenTo(button)            reactions += {        case ButtonClicked(b) => {          val result = fileChooser.showOpenDialog(mainPanel)          if(result == FileChooser.Result.Approve){            label.text = fileChooser.selectedFile.getPath()          }        }      }    }      }