TreeMap methods in java What is the result of JavaChamp Team Flash

Question 204 / 297: What is the result of compiling and running the following code?

import java.util.TreeMap;


public class Test {

	public static void main(String[] args) {
		TreeMap<Integer,String> map  = new TreeMap<Integer,String>();
		map.put(1, "one");
		map.put(2, "two");
		map.put(3, "three");
		map.put(4, "four");
		System.out.print(map.higherKey(2));
		System.out.print(map.ceilingKey(2));
		System.out.print(map.floorKey(1));
		System.out.print(map.lowerKey(1));
	}
}

A 3211

B 321null

C 321-1

D 231null

E 2310

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Explanation:

ceilingKey: returns the least key greater than or equal to the given key, or null if there is no such key.

floorKey: returns the greatest key less than or equal to the given key, or null if there is no such key.

higherKey: returns the least key strictly greater than the given key, or null if there is no such key.

lowerKey: returns the greatest key strictly less than the given key, or null if there is no such key.

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