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Java TreeMap floorKey() Method

TheJava TreeMap floorKey(K key) method is used to return the greatest key less than or equal to the given key, or null if there is no such key.

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

public K floorKey(K key)

key − This is the key to be matched.

The method call returns the greatest key less than or equal to key, or null if there is no such key.

• ClassCastException − This exception is thrown if the specified key cannot be compared with the keys currently in the map.

• NullPointerException − This exception is thrown if the specified key is null and this map uses natural ordering, or its comparator does not permit null keys.

The following example shows the usage of Java TreeMap floorKey() method to get greatest key less than or equal to the given key in the map. We've created a TreeMap object of Integer,Integer pairs. Then few entries are added, and using floorKey() we're printing relevant key to the given 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 greatest key for key 4          
      System.out.println("Checking Keys of the map");
      System.out.println("Key is: "+ treemap.floorKey(3));
   }     
}

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

Checking values of the map
Value is: 3

The following example shows the usage of Java TreeMap floorKey() method to get greatest key less than or equal to the given key in the map. We've created a TreeMap object of Integer,String pairs. Then few entries are added, and using floorKey() we're printing relevant key to the given 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 greatest key for key 4          
      System.out.println("Checking Keys of the map");
      System.out.println("Key is: "+ treemap.floorKey(3));
   }     
}

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

Checking Keys of the map
Key is: 3

The following example shows the usage of Java TreeMap floorKey() method to get the greatest key less than or equal to the given key in the map. We've created a TreeMap object of Integer,Student pairs. Then few entries are added, and using floorKey() we're printing relevant key to the given 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(6, "Julia"));
      treemap.put(5, new Student(5, "Tom"));

      // getting greatest key for key 4          
      System.out.println("Checking Keys of the map");
      System.out.println("Key is: "+ treemap.floorKey(3));
   }     
}
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 Keys of the map
Key is: 3

java_util_treemap.htm

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