Last Updated : 09 Jul, 2018
The java.util.TreeMap.lastKey() is used to retrieve the last or the highest key present in the map.
Syntax:tree_map.lastKey()Parameters:
The method does not take any parameters.
Return Value:The method returns the last key present in the map.
Exception:The method throws
NoSuchElementExceptionif the map is empty. Below programs illustrate the working of java.util.TreeMap.lastKey() method:
Program 1: Java
// Java code to illustrate the lastKey() method
import java.util.*;
public class Tree_Map_Demo {
public static void main(String[] args)
{
// Creating an empty TreeMap
TreeMap<Integer, String> tree_map = new TreeMap<Integer, String>();
// Mapping string values to int keys
tree_map.put(10, "Geeks");
tree_map.put(15, "4");
tree_map.put(20, "Geeks");
tree_map.put(25, "Welcomes");
tree_map.put(30, "You");
// Displaying the TreeMap
System.out.println("The Mappings are: " + tree_map);
// Displaying the lastKey of the map
System.out.println("The last key is " + tree_map.lastKey());
}
}
Output:
The Mappings are: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You}
The last key is 30
Program 2: Java
// Java code to illustrate the lastKey() method
import java.util.*;
public class Tree_Map_Demo {
public static void main(String[] args)
{
// Creating an empty TreeMap
TreeMap<String, Integer> tree_map = new TreeMap<String, Integer>();
// Mapping int values to string keys
tree_map.put("Geeks", 10);
tree_map.put("4", 15);
tree_map.put("Geeks", 20);
tree_map.put("Welcomes", 25);
tree_map.put("You", 30);
// Displaying the TreeMap
System.out.println("The Mappings are: " + tree_map);
// Displaying the lastKey of the map
System.out.println("The last key is " + tree_map.lastKey());
}
}
Output:
The Mappings are: {4=15, Geeks=20, Welcomes=25, You=30}
The last key is You
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4