Refresh Your Java - Before Java Interview
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Java SortMap Descending :
public class SortMapDescending {
public static <K, V>
Map<K, V> sortByValue(Map<K, V> map)
{
final int size = map.size();
final List<Map.Entry<K, V>> meView =
new
ArrayList<Map.Entry<K,V>>(size);
meView.addAll(map.entrySet());
Collections.sort(meView, new
DescendingValueComparator());
Map<K,V> sortedMap = new HashMap();
for (int i = 0; i < size; i++) {
sortedMap.put(meView.get(i).getKey(),
map.get(meView.get(i).getKey()));
}
return sortedMap;
}
}
import
java.math.BigDecimal;
import java.util.Comparator;
import java.util.Map;
final class
DescendingValueComparator<V extends Comparable<?
super V>>
implements Comparator<Map.Entry<?, V>>
{
public int
compare(Map.Entry<?, V> o1, Map.Entry<?,
V> o2) {
return o2.getValue().compareTo(o1.getValue());
}
}
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