What is the NavigableSet.floor() method in Java?
In this shot, we will learn how to use the NavigableSet.floor() method in Java. The NavigableSet.floor() method is used to obtain the greatest element that is equal to or less than a given element in a set.
It returns null if there is no such element in the set.
The
NavigableSet.floor()method is present in theNavigableSetinterface inside thejava.utilpackage.
Let’s understand with the help of an example. Suppose that a NavigableSet contains [1, 5, 3, 9, 10, 11, 16, 19]. Let be the element for which we need to determine the floor. So, the result of NavigableSet.floor() is .
Parameter
The NavigableSet.floor() accepts one parameter, i.e., the element for which we need to determine the floor value.
Return value
It returns the greatest element that is equal to or less than the given element in the set.
Code
Let’s have a look at the code.
import java.util.NavigableSet;import java.util.TreeSet;class Main{public static void main(String[] args){NavigableSet<Integer> s = new TreeSet<Integer>();s.add(6);s.add(8);s.add(5);s.add(3);s.add(9);s.add(10);s.add(17);System.out.println("Greatest element less than or equal to 11 is: " + s.floor(11));}}
Explanation
-
In lines 1 and 2, we import the required packages and classes.
-
In line 4 we make a
Mainclass. -
In line 6, we make a
main()function. -
In line 8, we create a
TreeSetofIntegertype. TheNavigableSetis inherited fromSortedSet, which is actually inherited fromTreeSetonly. AsSortedSetandNavigableSetare interfaces, we cannot instantiate an object of them. -
From lines 10 to 16, we added the elements into the
NavigableSetby using theadd()method. -
In line 18, we use the
NavigableSet.floor()method and display the result with a message.
In this way, we can use the NavigableSet.floor() method in Java.
