Java by API/java.util/Queue

Queue: add(String e)

   <source lang="java">
 

import java.util.ArrayList; import java.util.LinkedList; import java.util.List; import java.util.Queue; public class Main {

 public static void main(String[] args) {
   Queue<String> queue = new LinkedList<String>();
   queue.add("Hello");
   queue.add("World");
   List<String> list = new ArrayList<String>(queue);
   System.out.println(list);
 }

}

 </source>
   
  
 
  

Queue: element()

   <source lang="java">

import java.util.LinkedList; import java.util.Queue; public class Main {

 public static void main(String[] args) {
   Queue<String> queue = new LinkedList<String>();
   queue.offer("First");
   queue.offer("Second");
   queue.offer("Third");
   queue.offer("Fourth");
   System.out.println("Size: " + queue.size());
   System.out.println("Queue head using peek   : " + queue.peek());
   System.out.println("Queue head using element: " + queue.element());
   Object data;
   while ((data = queue.poll()) != null) {
     System.out.println(data);
   }
 }

}

 </source>
   
  
 
  

Queue: peek()

   <source lang="java">

import java.util.LinkedList; import java.util.Queue; public class Main {

 public static void main(String[] args) {
   Queue<String> queue = new LinkedList<String>();
   queue.offer("First");
   queue.offer("Second");
   queue.offer("Third");
   queue.offer("Fourth");
   System.out.println("Size: " + queue.size());
   System.out.println("Queue head using peek   : " + queue.peek());
   System.out.println("Queue head using element: " + queue.element());
   Object data;
   while ((data = queue.poll()) != null) {
     System.out.println(data);
   }
 }

}

 </source>
   
  
 
  

Queue: poll()

   <source lang="java">

import java.util.LinkedList; import java.util.Queue; public class Main {

 public static void main(String[] args) {
   Queue<String> queue = new LinkedList<String>();
   queue.offer("First");
   queue.offer("Second");
   queue.offer("Third");
   queue.offer("Fourth");
   System.out.println("Size: " + queue.size());
   System.out.println("Queue head using peek   : " + queue.peek());
   System.out.println("Queue head using element: " + queue.element());
   Object data;
   while ((data = queue.poll()) != null) {
     System.out.println(data);
   }
 }

}

 </source>
   
  
 
  

Queue: size()

   <source lang="java">

import java.util.LinkedList; import java.util.Queue; public class Main {

 public static void main(String[] args) {
   Queue<String> queue = new LinkedList<String>();
   queue.offer("First");
   queue.offer("Second");
   queue.offer("Third");
   queue.offer("Fourth");
   System.out.println("Size: " + queue.size());
   System.out.println("Queue head using peek   : " + queue.peek());
   System.out.println("Queue head using element: " + queue.element());
   Object data;
   while ((data = queue.poll()) != null) {
     System.out.println(data);
   }
 }

}

 </source>