笔试题

代码执行顺序：

class Parent {    static {        System.out.println("B");    }    {        System.out.println("A");    }    Parent() {        System.out.println("C");    }}class Son extends Parent {    static {        System.out.println("E");    }    {        System.out.println("D");    }    Son() {        System.out.println("F");    }}

结果：B E A C D F

    public void method (Object o) {        System.out.println("o");    }    public void method (String s) {        System.out.println("S");    }    method(null);

结果：S