Discussion
What will be the output of the program?
import java.util.*;
public class Program66
{
public static void main(String[] args)
{
Map<String, Integer> scores = new TreeMap<String, Integer>();
scores.put("b", 2); scores.put("a", 1); scores.put("c", 3);
System.out.println(
((TreeMap<String, Integer>) scores).firstKey() + " " + scores);
}
}
Answer: B
A TreeMap keeps its keys in natural order regardless of insertion order, so firstKey is a and the map prints sorted. The cast is needed only because firstKey belongs to SortedMap rather than to the Map interface the variable is declared with.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development