Module6-字符串、格式化以及封装类.docxVIP

Copyright Tarena Corporation,2008.All rights reservedModule6-字符串、格式化以及封装类一、选择题Question 1Given:11. class Converter {12. public static void main(String[] args) {13. Integer i = args[0];14. int j = 12;15. System.out.println(It is + (j==i) + that j==i.);16. }17. }What is the result when the programmer attempts to compile the codeand run it with the command java Converter 12?A. It is true that j==i.B. It is false that j==i.C. An exception is thrown at runtime.D. Compilation fails because of an error in line 13.Answer: DQuestion 2Given:10. public class MyClass {11.12. public Integer startingI;13. public void methodA() {14. Integer i = new Integer(25);15. startingI = i;16. methodB(i);17. }18. private void methodB(Integer i2) {19. i2 = i2.intValue();20.21. }22. }If methodA is invoked, which two are true at line 20? (Choose two.)A. i2 == startingI returns true.B. i2 == startingI returns false.C. i2.equals(startingI) returns true.D. i2.equals(startingI) returns false.Answer: BCCopyright Tarena Corporation,2008.All rights reservedQuestion 3Given:11. public class Yikes {12.13. public static void go(Long n) {System.out.println(Long );}14. public static void go(Short n) {System.out.println(Short );}15. public static void go(int n) {System.out.println(int );}16. public static void main(String [] args) {17. short y= 6;18. long z= 7;19. go(y);20. go(z);21. }22. }What is the result?A. int LongB. Short LongC. Compilation fails.D. An exception is thrown at runtime.Answer: AQuestion 4Given:1. public class Target {2. private int i = 0;3. public int addOne() {4. return ++i;5. }6. }And:1. public class Client {2. public static void main(String[] args) {3. System.out.println(new Target().addOne());4. }5. }Which change can you make to Target without affecting Client?A. Line 4 of class Target can be changed to return i++;B. Line 2 of class Target can be changed to private int i = 1;C. Line 3 of class Target can be changed to private int addOne() {D. Line 2 of class Target can be changed to pr