The lowerEntry() method of NavigableMap interface in Java is used to return a key-value mapping associated with the greatest key strictly less than the given key, or null if there is no such key existed.
Syntax:
Map.Entry< K, V > lowerEntry(K key)
Where, K is the type of key maintained by this map and V is the type of values mapped to the keys.
Parameters: This function accepts a single parameter Key which refers to the type of key maintained by this map container.
Return Value: It returns a key-value mapping associated with the greatest key strictly less than the given key, or null if there is no such key existed.
Below programs illustrate the lowerEntry() method in Java:
Program 1: When the key is integer.
// Java code to demonstrate the working of// lowerEntry() 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> nmmp = new TreeMap<>();          // assigning the values in the NavigableMap        // using put()        nmmp.put(2, "two");        nmmp.put(7, "seven");        nmmp.put(3, "three");          System.out.println("The mapping with greatest key strictly"                           + " less than 7 is : " + nmmp.lowerEntry(7));    }} |
The mapping with greatest key strictly less than 7 is : 3=three
Program 2: When the key is string.
// Java code to demonstrate the working of// lowerEntry() method  import java.io.*;import java.util.*;  public class GFG {      public static void main(String[] args)    {          // Declaring the NavigableMap of Integer and String        NavigableMap<String, String> tmmp = new TreeMap<>();          // assigning the values in the NavigableMap        // using put()        tmmp.put("one", "two");        tmmp.put("six", "seven");        tmmp.put("two", "three");          System.out.println("The mapping with greatest key strictly"                           + " less than 7 is : " + tmmp.lowerEntry("two"));    }} |
The mapping with greatest key strictly less than 7 is : six=seven
Reference: https://docs.oracle.com/javase/10/docs/api/java/util/NavigableMap.html#lowerEntry(K)
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