Discussion
What will be the output of the program?
import java.util.*;
public class Probe95
{
public static void main(String[] args)
{
Map<String, Integer> m = new HashMap<String, Integer>();
m.put("a", 1);
for (Map.Entry<String, Integer> e : m.entrySet())
{
System.out.println(e.getKey() + "=" + e.getValue());
}
}
}
Answer: C
Iterating entrySet gives each key and value together, so building the text by hand produces a=1. Looping over keySet and calling get for each key gives the same result at the cost of a second lookup per entry, which is why entrySet is preferred.
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