NavigableMap ceilingEntry() method in Java
Last Updated :
29 Sep, 2018
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.
import java.io.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
NavigableMap<Integer, String> navmap = new TreeMap<>();
navmap.put( 2 , "two" );
navmap.put( 7 , "seven" );
navmap.put( 3 , "three" );
System.out.println( "The next greater key-value of 5 is : "
+ navmap.ceilingEntry( 5 ));
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.
import java.io.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
NavigableMap<String, String> navmap = new TreeMap<String, String>();
navmap.put( "one" , "Geeks" );
navmap.put( "two" , "for" );
navmap.put( "three" , "Geeks" );
System.out.println( "The next greater key-value of a is : "
+ navmap.ceilingEntry( "a" ));
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)
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