Discussion
What will be the output of the program?
import java.util.*;
public class Sample47
{
public static void main(String[] args)
{
Map<String, Integer> m = new TreeMap<String, Integer>();
m.put("b", 2); m.put("a", 1);
for (Map.Entry<String, Integer> e : m.entrySet())
{
e.setValue(e.getValue() * 10);
}
System.out.println(m);
}
}
Answer: C
An entry obtained during iteration is a view onto the map, so setValue writes straight through and the stored values change. A TreeMap keeps its keys sorted, so the output is {a=10, b=20}. Changing a value is not a structural modification and does not upset the iterator.
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