NavigableSet isEmpty() method in Java
Last Updated :
30 Sep, 2019
The java.util.NavigableSet.isEmpty() method is used to check if a NavigableSet is empty or not. It returns True if the NavigableSet is empty otherwise it returns False.
Syntax:
boolean isEmpty()
Parameters: This method does not take any parameter
Return Value: The method returns True if the NavigableSet is empty else returns False.
Below program illustrate the java.util.NavigableSet.isEmpty() method:
import java.io.*;
import java.util.*;
public class NavigableSetDemo {
public static void main(String args[])
{
NavigableSet<String> st = new TreeSet<String>();
st.add( "Welcome" );
st.add( "To" );
st.add( "Geeks" );
st.add( "4" );
st.add( "Geeks" );
System.out.println( "NavigableSet: " + st);
System.out.println( "Is the NavigableSet empty? "
+ st.isEmpty());
st.clear();
System.out.println( "Is the NavigableSet empty? "
+ st.isEmpty());
}
}
|
Output:
NavigableSet: [4, Geeks, To, Welcome]
Is the NavigableSet empty? false
Is the NavigableSet empty? true
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