java题库——认证考试题1

目录

一. 单选题

1. (单选题)Which of the following are correct? (Choose all that apply.)

2. (单选题)Given the following two class files, what is the maximum number of imports that can beremoved and have the code still compile?// Water.javapackage aquarium;public class Water { }// Tank.javapackage aquarium;import java.lang.*;import java.lang.System;import aquarium.Water;import aquarium.*;public class Tank {public void print(Water water) {System.out.println(water); } }

3. (单选题)What is the output of executing the following class?

4. (单选题)Which statements about the following class are correct? (Choose all that apply.)

5. (单选题)Assuming the following class compiles, how many variables defined in the class or methodare in scope on the line marked on line 14?

二. 多选题

6. (多选题)Which statements about the following class are true? (Choose all that apply.)

7. (多选题)Which of the following are true? (Choose all that apply.)public class Bunny {public static void main(String[] x) { Bunny bun = new Bunny();} }

8. (多选题)Which are true about the following code? (Choose all that apply.)var num1 = Long.parseLong("100");var num2 = Long.valueOf("100");System.out.println(Long.max(num1, num2));

9. (多选题)What lines are printed by the following program? (Choose all that apply.)

10. (多选题)Which of the following are legal entry point methods that can be run from the commandline? (Choose all that apply.)

11. (多选题)Which of the following expressions, when inserted independently into the blank line, allowthe code to compile? (Choose all that apply.)public void printMagicData() {var magic = ;System.out.println(magic);}

12. (多选题)Which of the following statements about garbage collection are correct? (Choose allthat apply.)

13. (多选题)Which of the following code snippets about var compile without issue when used in amethod? (Choose all that apply.)

14. (多选题)Which are true about this code? (Choose all that apply.)