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Programming Articles
Page 2327 of 2547
What is an anonymous array and explain with an example in Java?
An array is a data structure/container/objectthat stores a fixed-size sequential collection of elements of the same type. The size/length of the array is determined at the time of creation.The position of the elements in the array is called as index or subscript. The first element of the array is stored at the index 0 and, the second element is at the index 1 and so on.Each element in an array is accessed using an expression which contains the name of the array followed by the index of the required element in square brackets.For example, if an array of 6 elements ...
Read MoreHow to convert integer set to int array using Java?
A collection object in Java is the one which stores references of other objects in it. The java.util package provides the classes and interfaces for collections. There are four main collection interfaces namely Set Lists, Queues, Maps.Set − The set object is a collection which stores group of elements, it grows dynamically and it does not allow duplicate elements.HashSet and LinkedHashSet are the classes that implements Set interface. You can create a Set object by implementing either of these classes.Exampleimport java.util.HashSet; public class SetExample { public static void main(String args[]) { //Instantiating the HashSet ...
Read MoreAre the constructors in an object invoked when de-serialized in Java?
In Java, serialization is a concept using which we can write the state of an object into a byte stream so that we can transfer it over the network (using technologies like JPA and RMI).To serialize an object −Make sure the class implements the Serializable interface.Create a FileOutputStream object representing the file (abstract path) of the file to which the object is to be stored.Create a ObjectOutputStream object by passing the above created FileOutputStream object.Write the object to the file using the writeObject() method.To de-serialize an objectCreate a FileInputStream object representing the file that contains the serialized object.Read the object ...
Read MoreWhat are the different ways of copying an array into another array in Java?
In general, arrays are the containers that store multiple variables of the same datatype. These are of fixed size and the size is determined at the time of creation. Each element in an array is positioned by a number starting from 0. You can access the elements of an array using name and position as −System.out.println(myArray[3]); //Which is 1457 Creating an array in Java:In Java, arrays are treated as referenced types you can create an array using the new keyword similar to objects and populate it using the indices as −int myArray[] = new int[7]; myArray[0] = 1254; myArray[1] = ...
Read MoreWhat happens if try to access an element with an index greater than the size of the array in Java?
An array is a data structure/container/object that stores a fixed-size sequential collection of elements of the same type. The size/length of the array is determined at the time of creation.The position of the elements in the array is called as index or subscript. The first element of the array is stored at the index 0 and, the second element is at the index 1 and so on.Each element in an array is accessed using an expression which contains the name of the array followed by the index of the required element in square brackets.For example, if an array of 6 elements ...
Read MoreCan you pass the negative number as an Array size in Java?
In general, arrays are the containers that store multiple variables of the same datatype. These are of fixed size and the size is determined at the time of creation. Each element in an array is positioned by a number starting from 0.You can access the elements of an array using name and position as −System.out.println(myArray[3]); //Which is 1457Creating an array in JavaIn Java, arrays are treated as referenced types you can create an array using the new keyword similar to objects and populate it using the indices as −int myArray[] = new int[7];While creating array in this way, you must ...
Read MoreCan you assign an Array of 100 elements to an array of 10 elements in Java?
In general, arrays are the containers that store multiple variables of the same datatype. These are of fixed size and the size is determined at the time of creation. Each element in an array is positioned by a number starting from 0.You can access the elements of an array using name and position as −System.out.println(myArray[3]); //Which is 1457Creating an array in JavaIn Java, arrays are treated as referenced types you can create an array using the new keyword similar to objects and populate it using the indices as −int myArray[] = new int[7];While creating array in this way, you must specify ...
Read MoreWhat are the best practices to keep in mind while using packages in Java?
You can create the .class files of all the Java classes and interfaces related to each other in one folder automatically by declaring them under same package. A package is nothing but a directory storing classes and interfaces of a particular concept.Creating a packageYou can create a package and add required classes/interfaces in it just by declaring the package on the top of the Class/Interface files using the keyword package as −Package package_name;ExampleFollowing Java program, demonstrates the declaration of a package in Java.package com.tutorialspoint.mypackage; public class Sample{ public void demo(){ System.out.println("This is a method of the ...
Read MoreDifference between import and package in Java?
In Java classes and interfaces related to each other are grouped under a package. Package is nothing but a directory storing classes and interfaces of a particular concept. For example, all the classes and interfaces related to input and output operations are stored in java.io package.Creating a packageYou can group required classes and interfaces under one package just by declaring the package at the top of the Class/Interface (file) using the keyword package as −package com.tutorialspoint.mypackage; public class Sample{ public void demo(){ System.out.println("This is a method of the sample class"); } public static void main(String ...
Read MoreHow do you print the content of an array in Java?
In general, arrays are the containers that store multiple variables of the same datatype. These are of fixed size and the size is determined at the time of creation. Each element in an array is positioned by a number starting from 0.You can access the elements of an array using name and position as −System.out.println(myArray[3]); //Which is 1457Creating an array in JavaIn Java, arrays are treated as referenced types you can create an array using the new keyword similar to objects and populate it using the indices as −int myArray[] = new int[7]; myArray[0] = 1254; myArray[1] = 1458; myArray[2] ...
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