JAVA测试题
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JA V A第一次测试题
Question No: 1
Given:
Integer i = new Integer (42);
Long 1 = new Long (42);
Double d = new Double (42.0);
Which two expressions evaluate to True? (Choose Two)
A. (i ==1)
B. (i == d)
C. (d == 1)
D. (i.equals (d))
E. (d.equals (i))
F. (i.equals (42))
Question No: 2
Which two statements are true for the class java.util.TreeSet? (Choose two)
A. The elements in the collection are ordered.
B. The collection is guaranteed to be immutable.
C. The elements in the collection are guaranteed to be unique.
D. The elements in the collection are accessed using a unique key.
E. The elements in the collection are guaranteed to be synchronized
Question No: 3
What happens when you try to compile and run the following application? Choose all correct options.
1. public class Z {
2. public static void main(String[] args) {
3. new Z();
4. }
5.
6. Z() {
7. Z alias1 = this;
8. Z alias2 = this;
9. synchronized(alias1) {
10. try {
11. alias2.wait();
12. System.out.println(“DONE WAITING”);
13. }
14. catch (InterruptedException e) {
15. System.out.println(“INTERR UPTED”);
16. }
17. catch (Exception e) {
18. System.out.pr intln(“OTHER EXCEPTION”);
19. }
20. finally {
21. System.out.println (“FINALLY”);
22. }
23. }
24. System.out.println(“ALL DONE”);
25. }
26. }
A. The application compiles but doesn't print anything.
B. The application compiles and print “DONE WAITING”
C. The application compiles and print “FINALLY”
D. The application compiles and print “ALL DONE”
E. The application compiles and print “INTERRUPTED”
Question No: 4
True or False: Readers have methods that can read and return floats and doubles.
A. Ture
B. False
Question No: 5
Which two demonstrate a "has a" relationship? (Choose two)
A.
public interface Person { }
public class Employee extends Person{ }
B.
public interface Shape { }
public interface Rectandle extends Shape { }
C.
public interface Colorable { }
public class Shape implements Colorable { }
D.
public class Species{ }
public class Animal{private Species species;}
E.
interface Component{ }
class Container implements Component{
private Component[] children;
}
Question No: 6
Which of the following lines of code will compile without error？
A.