单选题

定义如下程序： Public class Person{ { ...

Question

定义如下程序：

public  class  Person{
    {
         System.out.println("P1")
    }
    static{
         System.out.println("P2")
    }
    public Person(){
         System.out.println("P3")
    }
}
public  class  Students extends Person{
    static{
        System.out.println("S1")
    }
    {
         System.out.println("S2")
    }
    public Students(){
         System.out.println("S3")
    }
    public static void  main(String[] args){
         new Students()
    }
}

程序执行结果是？（）

A. P1P2P3S1S2S3

B. P1P2P3S2S1S3

C. P2P1S1P3S2S3

D. P2S1P1P3S2S3