JAVA复习题201003答案.xls

多选题 判断题 测试 题目 选项 以下代码: 11. static void test() throws RuntimeException{ 12. try{ 13. System.out.print(test ); 14. throw new RuntimeException(); 15. } 16. catch(Exception ex){ System.out.print(exception );} 17. } 18. public static void main(String[] args){ 19. try{test();} 20. catch(RuntimeException ex){System.out.print(runtime );} 21. System.out.print(end ); 22. } 运行结果是? test end 编译错误 test runtime end 12 test exception end A Throwable is thrown by main at runtime. 以下代码: 33. try{ 34. //some code here 35. }catch(NullPointerException el){ 36. System.out.print(a); 37. }catch(Exception e2){ 38. System.out.print(b); 39. }finally{ 40. System.out.print(c); 41. } 如果34行处抛出异常，输出的结果可能是？ a b c ac abc 以下代码: 11. static void test(){ 12. try{ 13. String x = null; 14. System.out.print(x.toString() + ); 15. } 16. finally{System.out.print(finally );} 17. } 18. public static void main(String[] args){ 19. try{test();} 20. catch(Exception ex){System.out.print(exception );} 21. } 运行的结果是? null finally null finally finally exception 假定当前目录是空的并且有读和写的权限，执行以下代码: 11. import java.io.*; 12. public class DOS{ 13. public static void main(String[] args){ 14. File dir = new File(dir); 15. dir.mkdir(); 16. File f1 = new File(dir, f1.txt); 17. try{ 18. f1.createNewFile(); 19. }catch(IOException e){;} 20. File newDir = new File(newDir); 21. dir.renameTo(newDir); 22. } 23. } 以下哪个语句是正确的? The file system has a new empty directory named dir. The file system has a new empty directory named newDir. The file system has a directory named dir, containing a file f1.txt. The file system has a directory named newDir, containing a file f1.txt. 以下代码: 1. public class Boxer1{ 2. Integer i 3. int x; 4. public Boxer1(int y){ 5. x = i + y; 6. System.out.println(x); 7. } 8. public static void main(String[] args){ 9. new Boxer1(new Integer(4)); 10. } 11. } 运行结果是? The value 4 is printed at the command line. Compilation fails because of an error in line 5. Compilation fails because of an error in line 9. A NullPointerException