The clear() method of AbstractQueue removes all of the elements from this queue. The queue will be empty after this call returns.
Syntax:
public void clear()
Parameters: This method does not accept any parameters.
Returns: The method does not returns anything.
Below programs illustrate clear() method:
Program 1:
// Java program to illustrate the// AbstractQueue clear() methodimport java.util.*;import java.util.concurrent.LinkedBlockingQueue; public class GFG1 { public static void main(String[] argv) throws Exception { // Creating object of AbstractQueue<Integer> AbstractQueue<Integer> AQ1 = new LinkedBlockingQueue<Integer>(); // Populating AQ1 AQ1.add(10); AQ1.add(20); AQ1.add(30); AQ1.add(40); AQ1.add(50); // print AQ System.out.println("AbstractQueue1 contains : " + AQ1); AQ1.clear(); System.out.println("AbstractQueue1 : " + AQ1); }} |
Output:
AbstractQueue1 contains : [10, 20, 30, 40, 50] AbstractQueue1 : []
Program 2:
// Java program to illustrate the// AbstractQueue clear() methodimport java.util.*;import java.util.concurrent.LinkedBlockingQueue; public class GFG1 { public static void main(String[] argv) throws Exception { // Creating object of AbstractQueue<String> AbstractQueue<String> AQ1 = new LinkedBlockingQueue<String>(); // Populating AQ1 AQ1.add("gopal"); AQ1.add("gfg"); AQ1.add("java"); // print AQ System.out.println("AbstractQueue1 contains : " + AQ1); AQ1.clear(); System.out.println("AbstractQueue1 : " + AQ1); }} |
Output:
AbstractQueue1 contains : [gopal, gfg, java] AbstractQueue1 : []
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/AbstractQueue.html#clear–
