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Java TreeMap lastKey() Method

The Java TreeMap lastKey() method is used to return the last (highest) key currently in this map.

Following is the declaration for java.util.TreeMap.lastKey() method.

public K lastKey()

NA

The method call returns the last (highest) key currently in this map.

NoSuchElementException − This exception is thrown if this map is empty.

The following example shows the usage of Java TreeMap lastKey() method to get the last or highest key present in the map. We've created a TreeMap object of Integer,Integer pairs. Then few entries are added, and using lastKey() we're printing the last key.

package com.tutorialspoint;

import java.util.TreeMap;

public class TreeMapDemo {
   public static void main(String[] args) {

      // creating tree map 
      TreeMap<Integer, Integer> treemap = new TreeMap<>();

      // populating tree map
      treemap.put(2, 2);
      treemap.put(1, 1);
      treemap.put(3, 3);
      treemap.put(6, 6);
      treemap.put(5, 5);

      // getting the last key   
      System.out.println("Checking last key");
      System.out.println("Value is: "+ treemap.lastKey());
   }     
}

Let us compile and run the above program, this will produce the following result.

Checking last key
Value is: 6

The following example shows the usage of Java TreeMap lastKey() method to get the last or highest key present in the map. We've created a TreeMap object of Integer,String pairs. Then few entries are added, and using lastKey() we're printing the last key.

package com.tutorialspoint;

import java.util.TreeMap;

public class TreeMapDemo {
   public static void main(String[] args) {

      // creating tree map 
      TreeMap<Integer, String> treemap = new TreeMap<>();

      // populating tree map
      treemap.put(2, "two");
      treemap.put(1, "one");
      treemap.put(3, "three");
      treemap.put(6, "six");
      treemap.put(5, "five");

      // getting the last key   
      System.out.println("Checking last key");
      System.out.println("Value is: "+ treemap.lastKey());
   }     
}

Let us compile and run the above program, this will produce the following result.

Checking last key
Value is: 6

The following example shows the usage of Java TreeMap lastKey() method to get the last or highest key present in the map. We've created a TreeMap object of Integer,Student pairs. Then few entries are added, and using lastKey() we're printing the last key.

package com.tutorialspoint;

import java.util.TreeMap;

public class TreeMapDemo {
   public static void main(String[] args) {

      // creating tree map 
      TreeMap<Integer, Student> treemap = new TreeMap<>();

      // populating tree map
      treemap.put(2, new Student(2, "Robert"));
      treemap.put(1, new Student(1, "Julie"));  
      treemap.put(3, new Student(3, "Adam"));
      treemap.put(6, new Student(5, "Julia"));
      treemap.put(5, new Student(5, "Tom"));

      // getting the last key   
      System.out.println("Checking last key");
      System.out.println("Value is: "+ treemap.lastKey());
   }     
}
class Student {
   int rollNo;
   String name;

   Student(int rollNo, String name){
      this.rollNo = rollNo;
      this.name = name;
   }

   @Override
   public String toString() {
      return "[ " + this.rollNo + ", " + this.name + " ]";
   }
   @Override
   public boolean equals(Object obj) {
      if(obj == null) return false;
      Student s = (Student)obj;
      return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name);
   }
}

Let us compile and run the above program, this will produce the following result.

Checking last key
Value is: 6

java_util_treemap.htm

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