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Java Articles
Page 444 of 450
Is null a keyword in Java?
No, null is not a keyword. Though they seem like keywords null, true and, false are considered as literals in Java.
Read MoreHow (where) are the elements of an array stored in memory?
In Java, arrays are objects, therefore just like other objects arrays are stored in heap area. An array store primitive data types or reference (to derived data) types Just like objects the variable of the array holds the reference to the array.
Read MoreHow to convert a byte array to a hex string in Java?
The printHexBinary() method of the DatatypeConverter class accepts a byte array and returns a hex string.Exampleimport javax.xml.bind.DatatypeConverter; public class ByteToHexString { public static void main(String args[]) { String sam = "Hello how are you how do you do"; byte[] byteArray = sam.getBytes(); String hex = DatatypeConverter.printHexBinary(byteArray); System.out.println(hex); } }Output48656C6C6F20686F772061726520796F7520686F7720646F20796F7520646F
Read MoreHow to declare a class in Java?
Following is the syntax to declare a class. class className { //Body of the class } You can declare a class by writing the name of the next to the class keyword, followed by the flower braces. Within these, you need to define the body (contents) of the class i.e. fields and methods.To make the class accessible to all (classes) you need to make it public. public class MyClass { //contents of the class (fields and methods) }
Read MoreWhy do Java array declarations use curly brackets?
Curly brackets usually denote sets and ensembles while parenthesis usually in most Algol-based programming languages curly braces are used to declare arrays.
Read MoreWhy are classes sometimes declared final in Java?
If a class is declared final, you cannot inherit it. If you try it gives you a compile-time error as − Example final class Super { private int data = 30; } public class Sub extends Sub { public static void main(String args[]){ } } Output Exception in thread "main" java.lang.Error: Unresolved compilation problem: at Sub.main(Sub.java:7)
Read MoreWhat is a composition in Java?
The composition is also a type of aggregation where the relationship is restrictive i.e. If two objects are in composition, the composed object will not exist without the other.
Read MoreWhat is the difference between compositions and aggregations in Java?
In Aggregation relationship among classes by which a class (object) can be made up of any combination of objects of other classes. It allows objects to be placed directly within the body of other classes.A composition is also a type of aggregation where the relationship is restrictive i.e. If two objects are in composition, the composed object will not exist without the other.
Read MoreWhat are native methods in Java and where are they used?
A native method in Java is a method whose implementation is written in other languages such as c and c++. The ‘native’ keyword is used before a method to indicate that it is implemented in other language.
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