Discussion
What will be the output of the program?
import java.util.*;
public class Program20
{
public static void main(String[] args)
{
Map<String, Integer> m = new LinkedHashMap<String, Integer>();
m.put("b", 2); m.put("a", 1); m.put("c", 3);
System.out.println(m.keySet());
}
}
Answer: D
A LinkedHashMap preserves insertion order, so the keys come back in the order they were first put: b, a, c. A plain HashMap makes no ordering promise and a TreeMap would sort them. This is the reason to choose LinkedHashMap over HashMap.
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