Example usage for java.util ArrayDeque element

Introduction

In this page you can find the example usage for java.util ArrayDeque element.

Prototype

public E element() 

Source Link

Document

Retrieves, but does not remove, the head of the queue represented by this deque.

Usage

From source file:Main.java

public static void main(String[] args) {

    ArrayDeque<Integer> deque = new ArrayDeque<Integer>(8);

    deque.add(25);/*w w w  .  j  a v  a 2 s.  co m*/
    deque.add(2);
    deque.add(1);
    deque.add(18);

    System.out.println(deque);

    // it will retrive element at first(head) position
    int retval = deque.element();
    System.out.println("Retrieved Element is = " + retval);
}

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From source file:com.google.gwt.emultest.java.util.ArrayDequeTest.java

public void testElement() {
    Object o1 = new Object();
    Object o2 = new Object();

    ArrayDeque<Object> deque = new ArrayDeque<>();
    try {/*from w  w w  . j ava 2s  .com*/
        deque.element();
        fail();
    } catch (NoSuchElementException expected) {
    }

    deque.add(o1);
    assertEquals(o1, deque.element());
    checkDequeSizeAndContent(deque, o1);

    deque.add(o2);
    assertEquals(o1, deque.element());
    checkDequeSizeAndContent(deque, o1, o2);

    deque.clear();
    assertTrue(deque.isEmpty());
    try {
        deque.element();
        fail();
    } catch (NoSuchElementException expected) {
    }
}

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