JAVA 考试试卷(带答案) 高博java培训S1阶段考试试卷
13. } 14. }
针对上述Test类,以下的叙述句中,哪个是正确的?
A. Line 5 will not compile, because void methods cannot be overridden.
B. Line 12 will not compile, because there is no version of test() that takes a char argument.
C. The code will compile but will throw an exception at line 12.
D. The code will compile and produce the following output: I am an int. E. The code will compile and produce the following output: I am a String. 8、若要写出一个能将一组键(Key)与一组值(Value)结合的类,下述所列的接口(interface),哪个是最适用的?
A. Map B. Set C. SortedSetD. Collection 9、运行下列程序,其输出结果为何? class Base { int i; Base() { add(1); }
void add(int v) { i += v; }
void print() {
System.out.println(i); } }
class Extension extends Base { Extension() { add(2); }
void add(int v) { i += v*2; } }
public class Qd073 {
public static void main(String args[]) { bogo(new Extension()); }
static void bogo(Base b) { b.add(8); b.print(); } }
A. 9 B. 18 C. 20 D. 21 E. 22
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