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SCJP Module-9 Question-6

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The example given below will test your knowledge of ConcurrentSkipListMap and you will learn how to get the current last value inserted using the getFloorKey() method of ConcurrentSkipListMap.

Given below the sample code :

import java.util.NavigableMap;
import java.util.concurrent.ConcurrentSkipListMap;
public class CheckSize {
public static void main(String... args) {
NavigableMap <Integer, String>nM = new ConcurrentSkipListMap<Integer, String>();
nM.put(4, "Wednesday");
nM.put(5, "Thursday");
nM.put(6, "Friday");
nM.put(1, "Sunday");
nM.put(2, "Monday");
System.out.print(nM.floorKey(3));
}}

What will be the output of the above code ?

1. Compile error

2. 2

3. null

4. 4

Answer

(2)

Explanation

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

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