【问题】 下列代码的执行结果为: () public class Super {public Integer getLength() { return new Integer(4); }public Integer getLength(int base) { return base + 4;}}class Sub extends Super {public Integer getLength() { return new Integer(5); }public static void main(String[]

下列代码的执行结果为: () public class Super {public Integer getLength() { return new Integer(4); }public Integer getLength(int base) { return base + 4;}}class Sub extends Super {public Integer getLength() { return new Integer(5); }public static void main(String[] args) {Super superObj = new Super();Sub subObj = new Sub();System.out.println(superObj.getLength().toString() + "," + subObj.getLength(2).toString() );}}输出是什么? A. 4,6B. 4,5C. 6,4D. 编译失败.---------重定时不能改变返回类型

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