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Java Articles
Page 314 of 450
Difference between length of Array and size of ArrayList in Java
In collections, one of the main functional requirement is to get the number of elements which are get stored in our collection so that one can decide whether to put more elements in it or not. Also, the number of elements is also required for iteration of collection.As we know Array and Arraylist both are used to store elements but both have different defined methods in order to know the number of elements stored in it.The array has a length method that provides the number of elements can be stored or in simple words capacity of the Array. Also, the ...
Read MoreDifference between Definition and Declaration in Java.
For the difference between definition and declaration, one should consider their literal meaning first which includes Declare means to announce or proclaim while Define means to describe some entity.The following are the important differences between the Definition and the Declaration.Sr. No.KeyDeclarationDefinition1ConceptThe concept of declaration includes informing the compiler about properties of the variable such as its name, type of value it holds and the initial value if any it takes.While the definition is basically the actual implementation and memory location of function and about memory for the variable is allocated during the definition of the variable.2Exception in CBoth declaration and ...
Read MoreDifference Between Daemon Threads and User Threads In Java
As we know java is a language that supports multi threading and on the basis of nature threads in java are classified into two types Daemon thread and User thread.The following are the important differences between Daemon Threads and User Threads.Sr. No.KeyDaemon ThreadsUser Threads1NatureDaemon thread is low in priority i.e JVM does not care much about these types of threads.User threads are recognized as high priority thread i.e. JVM will wait for any active user thread to get completed.2CPU availabilityIt is not guaranteed that Daemon thread always gets CPU usage whenever it requires due to its low priority.User thread always ...
Read MoreDifference between Arrays and Collection in Java
In order to store multiple values or objects of the same type, Java provides two types of data structures namely Array and Collection.The following are the important differences between Arrays and Collection.Sr. No.KeyArraysCollection1SizeArrays are fixed in size i.e once the array with the specific size is declared then we can't alter its size afterward.The collection is dynamic in size i.e based on requirement size could be get altered even after its declaration.2Memory ConsumptionArrays due to fast execution consumes more memory and has better performance.Collections, on the other hand, consume less memory but also have low performance as compared to Arrays.3Data ...
Read MoreDifference between an Iterator and ListIterator in Java
Java provided these two interfaces to traverse the data one by one stored in a collection. The internal implementation of iterator and list iterator makes them differ apart but the main agenda of both the iterators is the same.The following are the important differences between Iterator and ListIterator.Sr. No.KeyIteratorListIterator1ApplicableIterator can be used to traverse any collection irrespective of the type of collection.List iterator can only be used to iterate only List collection implemented classes like arraylist, linkedlist etc.2CallingAs mentioned Iterator must be used to enumerate elements in all Collections implemented interfaces like Set, List, Queue, Deque and also in all ...
Read MoreDifference between a Static Queue and a Singly Linked List in Java.
In Java List and Queue both are introduced as an ordered list of objects, where the same object may be added more than once. The difference between both comes in the manner of adding elements. In the queue, all the elements get inserted at the rear and removed from the front while we can add an element anywhere in the list.Sr. No.KeyStatic QueueSingly Linked List1Data initialization.Static Queue works in first out(FIFO) fashion as all the elements get inserted at the REAR and removed from the FRONT of the queue.In the case of Singly Linked List, one can add elements anywhere ...
Read MoreCan we throw an Unchecked Exception from a static block in java?
A static block is a block of code with a static keyword. In general, these are used to initialize the static members. JVM executes static blocks before the main method at the time of class loading.Example Live Demopublic class MyClass { static{ System.out.println("Hello this is a static block"); } public static void main(String args[]){ System.out.println("This is main method"); } }OutputHello this is a static block This is main methodExceptions in static blockJust like any other method in Java when an exception occurs in static block you can handle it using try-catch ...
Read MoreCan we to override a catch block in java?
DescriptionWhen a piece of code in particular method throws an exception, and is handled using try-catch pair. If we are calling this method from another one and, the calling line is wrapped within try-catch pair. Now, how can I override the catch block by the catch block of the calling method.When a piece of code in a method throws an exception (compile time) we must either handle it by wrapping it within the try-catch pair or, throw it (postpone) to the calling method using the throws keyword else a compile time error occurs.In the following Java example the code in ...
Read MoreHow to get Exception log from a console and write it to external file in java?
There are several logging frame works available to log your data in to files. You can also define your own method.Example − Using I/O packageFollowing Java program has an array storing 5 integer values, we are letting the user to choose two elements from the array (indices of the elements) and performing division between them. We are wrapping this code in try block with three catch blocks catching ArithmeticException, InputMismatchException and, ArrayIndexOutOfBoundsException. In each of them we are invoking the writeToFile() method.This method accepts an exception object, and appends it to a file using the write() method of the Files ...
Read MoreBufferedReader class in Java.
The BufferedReader class of Java is used to read the stream of characters from the specified source (character-input stream). The constructor of this class accepts an InputStream object as a parameter.This class provides a method named read() and readLine() which reads and returns the character and next line from the source (respectively) and returns them.Instantiate an InputStreamReader class bypassing your InputStream object as a parameter.Then, create a BufferedReader, bypassing the above obtained InputStreamReader object as a parameter.Now, read data from the current reader as String using the readLine() or read() method.ExampleThe following Java program demonstrates how to read integer data ...
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