TreeMap higherEntry() method in Java with Examples
The higherEntry() method of java.util.TreeMap class is used to return a key-value mapping associated with the least key strictly greater than the given key, or null if there is no such key.
Syntax:
public Map.Entry higherEntry(K key)
Parameters: This method takes the key as a parameter.
Return Value: This method returns an entry with the least key greater than key, or null if there is no such key.
Exception: This method throws the NullPointerException if the specified key is null and this map uses natural ordering, or its comparator does not permit null keys.
Below are the examples to illustrate the higherEntry() method
Example 1:
Java
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
TreeMap<Integer, String>
treemap = new TreeMap<Integer, String>();
treemap.put( 1 , "One" );
treemap.put( 2 , "Two" );
treemap.put( 3 , "Three" );
treemap.put( 4 , "Four" );
treemap.put( 5 , "Five" );
System.out.println( "TreeMap: " + treemap);
Map.Entry<Integer, String>
value
= treemap.higherEntry( 3 );
System.out.println( "The higherEntry value "
+ " for 3: " + value);
}
catch (NullPointerException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
TreeMap: {1=One, 2=Two, 3=Three, 4=Four, 5=Five}
The higherEntry value for 3: 4=Four
Example 2: For NullPointerException
Java
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
TreeMap<Integer, String>
treemap = new TreeMap<Integer, String>();
treemap.put( 1 , "One" );
treemap.put( 2 , "Two" );
treemap.put( 3 , "Three" );
treemap.put( 4 , "Four" );
treemap.put( 5 , "Five" );
System.out.println( "TreeMap: " + treemap);
System.out.println( "Trying to get "
+ "the higher entry value"
+ " for null" );
Map.Entry<Integer, String>
value
= treemap.higherEntry( null );
System.out.println( "Value is: " + value);
}
catch (NullPointerException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
TreeMap: {1=One, 2=Two, 3=Three, 4=Four, 5=Five}
Trying to get the higher entry value for null
Exception thrown : java.lang.NullPointerException
Last Updated :
06 Sep, 2022
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