The cielingEntry() method of NavigableMap interface in Java is used to returns a key-value mapping associated with the least key greater than or equal to the given key, or null if there is no such key exists.
Syntax:
Map.Entry< K, V > ceilingEntry(K key)
Parameters: It accepts a single parameter Key which is the key to be mapped.
Return Value: It returns a key-value mapping associated with the least key greater than or equal to the given key, or null if there is no such key exists.
Below programs illustrate the ceilingEntry() method in Java:
Program 1: When the key is integer.
// Java code to demonstrate the working of// ceilingEntry() method import java.io.*;import java.util.*; public class GFG { public static void main(String[] args) { // Declaring the NavigableMap of Integer and String NavigableMap<Integer, String> navmap = new TreeMap<>(); // assigning the values in the NavigableMap // using put() navmap.put(2, "two"); navmap.put(7, "seven"); navmap.put(3, "three"); // Use of ceilingEntry() // returns 7=seven ( next greater key-value) System.out.println("The next greater key-value of 5 is : " + navmap.ceilingEntry(5)); // returns "null" as no value present // greater than or equal to number System.out.println("The next greater key-value of 8 is : " + navmap.ceilingEntry(8)); }} |
Output:
The next greater key-value of 5 is : 7=seven The next greater key-value of 8 is : null
Program 2: When the key is string.
// Java code to demonstrate the working of// ceilingEntry() method import java.io.*;import java.util.*; public class GFG { public static void main(String[] args) { // Declaring the NavigableMap of String and String NavigableMap<String, String> navmap = new TreeMap<String, String>(); // assigning the values in the NavigableMap // using put() navmap.put("one", "Geeks"); navmap.put("two", "for"); navmap.put("three", "Geeks"); // Use of ceilingEntry() // returns one = Geeks ( next greater key-value of "a") System.out.println("The next greater key-value of a is : " + navmap.ceilingEntry("a")); // returns three = Geeks System.out.println("The next greater key-value of p is : " + navmap.ceilingEntry("p")); }} |
Output:
The next greater key-value of a is : one=Geeks The next greater key-value of p is : three=Geeks
Reference: https://docs.oracle.com/javase/10/docs/api/java/util/NavigableMap.html#ceilingEntry(K)
TreeMap ceilingEntry() and ceilingKey() methods in Java
NavigableMap lastEntry() method in Java
NavigableMap firstEntry() method in Java
NavigableMap ceilingKey() method in Java
NavigableMap pollLastEntry() method in Java
NavigableMap pollFirstEntry() method in Java
NavigableMap lowerEntry() method in Java
NavigableMap higherEntry() method in Java
NavigableMap floorKey() method in Java
NavigableMap floorEntry() method in Java
Please Login to comment…