class A {  publi

题目

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
更多“class A {  publi”相关问题