static box Main {
  main(args) {
    local console = new ConsoleBox()
    local a = new ArrayBox()
    a.push(10)
    a.push(20)
    console.println("alen=" + a.size())
    console.println("g0=" + a.get(0))
    console.println("g1=" + a.get(1))
    a.set(1, 30)
    console.println("g1b=" + a.get(1))
    return 0
  }
}