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import java.util.Map.Entry; | |
import java.util.TreeMap; | |
// See http://stackoverflow.com/a/13400317/611182 | |
public class Main { | |
private static TreeMap<Double, String> m = new TreeMap<Double, String>(); | |
static { | |
m.put(1.0, "A"); | |
m.put(2.9, null); | |
m.put(4.0, "B"); | |
m.put(6.0, null); | |
m.put(6.5, "C"); | |
m.put(10.0, null); | |
} | |
private static <K, V> V mappedValue(TreeMap<K, V> map, K key) { | |
Entry<K, V> e = map.floorEntry(key); | |
if (e != null && e.getValue() == null) { | |
e = map.lowerEntry(key); | |
} | |
return e == null ? null : e.getValue(); | |
} | |
private static final double[] testValues = new double[] { | |
0.9, | |
1.0, | |
1.1, | |
2.8, | |
2.9, | |
3.9, | |
4.0, | |
4.1, | |
5.9, | |
6.0, | |
6.1, | |
6.4, | |
6.5, | |
6.6, | |
9.9, | |
10.0, | |
10.1 | |
}; | |
public static void main(String[] args) { | |
for (double d : testValues) { | |
System.out.println(d + " " + mappedValue(m, d)); | |
} | |
} | |
} |
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