参考文档:https://www.oreilly.com/library/view/learning-scala/9781449368814/ch09.html
scala中locally类似于java中静态代码块
_ 类似于java中导包的星号,java.util.*,以及默认值
package HelloScala
object scala {
@volatile var i: person = _
def main(args : Array[String]): Unit = {
println(i)
println("hello scala %d".format(12))
println(a.speak)
}
}
class person(name:String){
val nam = name
}
object a{
def speak = "I'm A"
object b
locally{
println("I have not invoke this block")
}
}
输出结果如下:
null
hello scala 12
I have not invoke this block
I'm A
Process finished with exit code 0