class A {  public A() {  System.out.println(“hello from a”);

题目内容(请给出正确答案)
单选题
class A {  public A() {  System.out.println(“hello from a”);  }  }  class B extends A {  public B () {  System.out.println(“hello from b”);  super();  }  }  public class Test {  public static void main(String args[]) {  A a = new B();  }  }   What is the result when main is executed?()
A

 Compilation fails.

B

 hello from a

C

 hello from b

D

 hello from b hello from a

E

 hello from a hello from b

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