在 Gwitter 中添加 File 菜单

import groovy.swing.SwingBuilder
import javax.swing.*
import java.awt.*

class Gwitter{   
  static void main(String[] args){
    def gwitter = new Gwitter()
    gwitter.show()
  }
    
  void show(){
    def swingBuilder = new SwingBuilder()  
    
    def customMenuBar = {
      swingBuilder.menuBar{
        menu(text: "File", mnemonic: 'F') {
          menuItem(text: "Exit", mnemonic: 'X', actionPerformed: { dispose() })
        }
      }  
    }    
    
    swingBuilder.frame(title:"Gwitter", 
                       defaultCloseOperation:JFrame.EXIT_ON_CLOSE, 
                       size:[400,500],
                       show:true) {
      customMenuBar()                         
    }    
  }  
}