how deque works in java?
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['add()', 'addLast()', 'addFirst()', 'offer()', 'offerFirst()', 'offerLast()']
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How do-while loop works? First, the statements inside loop execute and then the condition gets evaluated, if the condition returns true then the control gets transferred to the “do” else it jumps to the next statement after do-while.
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The equals() method of the String class is not same as the equals() method of the Object class. It is overridden, this method accepts a String value and compares it with the current object and returns true only if the character sequences in the both String objects are exactly same.
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Basically synchronous means one can execute many things in parallel. With this respect Stringbuffer in java is synchronous class ie it allows the access of one single method by different threads in a synchronized manner and Stringbuilder is asynchronous aka not thread safe.
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Fail-fast iterators in Java don't play along when the underlying collection gets modified. Collections maintain an internal counter called modCount. Each time an item is added or removed from the Collection, this counter gets incremented.
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['Simple For loop.', 'Enhanced For loop.', 'Iterator.', 'ListIterator.', 'While loop.', 'Iterable.forEach() util.', 'Stream.forEach() util.']
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The do while loop checks the condition at the end of the loop. This means that the statements inside the loop body will be executed at least once even if the condition is never true. The do while loop is an exit controlled loop, where even if the test condition is false, the loop body will be executed at least once.
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The do/while loop is a variant of the while loop. This loop will execute the code block once, before checking if the condition is true, then it will repeat the loop as long as the condition is true.
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Time complexity for ArrayDeque for accessing a element is O(1) and that for LinkList is is O(N) to access last element. ArrayDeque is not thread safe so manually synchronization is necessary so that you can access it through multiple threads and so they they are faster.
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['Step 1) At time= 1, Process P3 arrives. ... ', 'Step 2) At time =2, process P1 arrives and is added to the waiting queue. ... ', 'Step 3) At time = 3, process P4 will finish its execution. ... ', 'Step 4) At time = 4, process P5 arrives and is added to the waiting queue.']
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The do while loop is an exit controlled loop, where even if the test condition is false, the loop body will be executed at least once. An example of such a scenario would be when you want to exit your program depending on the user input.
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Example of while loop step1: The variable count is initialized with value 1 and then it has been tested for the condition. step2: If the condition returns true then the statements inside the body of while loop are executed else control comes out of the loop.
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Deques have O(1) speed for appendleft() and popleft() while lists have O(n) performance for insert(0, value) and pop(0). List append performance is hit and miss because it uses realloc() under the hood. ... In contrast, deque append performance is consistent because it never reallocs and never moves data.
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A do while loop is similar to while loop with one exception that it executes the statements inside the body of do-while before checking the condition. On the other hand in the while loop, first the condition is checked and then the statements in while loop are executed.
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@BeforeMethod - BeforeMethod executes before each and every test method. All methods which uses @Test annotation. ... @BeforeTest will execute only one time before any test methods. Methods will run before executing any @Test annotated test method that is part of the <test> tag in testNG.
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The syntax of a do...while loop in C programming language is − do { statement(s); } while( condition ); Notice that the conditional expression appears at the end of the loop, so the statement(s) in the loop executes once before the condition is tested.
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equals() checks if two objects are the same or not and returns a boolean. compareTo() (from interface Comparable) returns an integer. It checks which of the two objects is "less than", "equal to" or "greater than" the other. ... Note that equals() doesn't define the ordering between objects, which compareTo() does.