The Java.util.NavigableSet.clear() method is used to remove all the elements from a NavigableSet. Using the clear() method only clears all the element from the NavigableSet and not deletes the NavigableSet. In other words, we can say that the clear() method is used to only empty an existing NavigableSet.
Syntax:
void clear()
Parameters: The method does not take any parameter
Return Value: The method does not returns any value.
Below program illustrate the Java.util.method.clear() method:
// Java code to illustrate clear()import java.io.*;import java.util.*;  public class NavigableSetDemo {    public static void main(String args[])    {        // Creating an empty NavigableSet        NavigableSet<String> st = new TreeSet<String>();          // Use add() method to add elements into the NavigableSet        st.add("Welcome");        st.add("To");        st.add("Geeks");        st.add("4");        st.add("Geeks");          // Displaying the NavigableSet        System.out.println("Initial NavigableSet: " + st);          // Clearing the NavigableSet using clear() method        st.clear();          // Displaying the final NavigableSet after clearing;        System.out.println("The final NavigableSet: " + st);    }} |
Output:
Initial NavigableSet: [4, Geeks, To, Welcome] The final NavigableSet: []
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