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Programming Articles
Page 1585 of 2547
What is the difference between compile time polymorphism and runtime polymorphism in java?
If we perform (achieve) method overriding and method overloading using instance methods, it is run time (dynamic) polymorphism. In dynamic polymorphism the binding between the method call an the method body happens at the time of execution and, this binding is known as dynamic binding or late binding. Example class SuperClass{ public static void sample(){ System.out.println("Method of the super class"); } } public class RuntimePolymorphism extends SuperClass { public static void sample(){ System.out.println("Method of the sub class"); ...
Read MoreSingle dimensional array in Java
Following is a simple example of a single dimensional array.Examplepublic class Tester { public static void main(String[] args) { double[] myList = {1.9, 2.9, 3.4, 3.5}; // Print all the array elements for (double element: myList) { System.out.print(element + " "); } } }Output1.9 2.9 3.4 3.5
Read MoreWhat is Is-a relationship in Java?
IS-A is a way of saying: This object is a type of that object. Let us see how the extends keyword is used to achieve inheritance.Examplepublic class Animal { } public class Mammal extends Animal { } public class Reptile extends Animal { } public class Dog extends Mammal { }Now, based on the above example, in Object-Oriented terms, the following are true −Animal is the superclass of Mammal class.Animal is the superclass of Reptile class.Mammal and Reptile are subclasses of Animal class.Dog is the subclass of both Mammal and Animal classes.Exampleclass Animal { } class Mammal extends Animal { ...
Read MoreHow to return an array from a method in Java?
We can return an array in Java from a method in Java. Here we have a method createArray() from which we create an array dynamically by taking values from the user and return the created array.Exampleimport java.util.Arrays; import java.util.Scanner; public class ReturningAnArray { public int[] createArray() { Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array that is to be created:: "); int size = sc.nextInt(); int[] myArray = new int[size]; System.out.println("Enter the elements of the array ::"); for(int i=0; i
Read MoreHow to overwrite a specific chunk in a byte array using java?
Java provides a ByteBuffer class which allows you to wrap an array into a byte buffer using its wrap() method. Once you did that you can replace the contents of the buffer using the position(): To select the starting position and, put(): To replace the data methods:Exampleimport java.nio.ByteBuffer; public class OverwriteChunkOfByteArray { public static void main(String args[]) { String str = "Hello how are you what are you doing"; byte[] byteArray = str.getBytes(); System.out.println("Contents of the byet array :: "); for(int i = 0; i
Read MoreCan i refer an element of one array from another array in java?
Yes, you can −int [] myArray1 = {23, 45, 78, 90, 10}; int [] myArray2 = {23, 45, myArray1[2], 90, 10};But, once you do so the second array stores the reference of the value, not the reference of the whole array. For this reason, any updating in the array will not affect the referred value −Exampleimport java.util.Arrays; public class RefferencingAnotherArray { public static void main(String args[]) { int [] myArray1 = {23, 45, 78, 90, 10}; int [] myArray2 = {23, 45, myArray1[2], 90, 10}; System.out.println("Contents of the 2nd ...
Read MoreHow to pull distinct values from an array in java?
To pull distinct values in an array you need to compare each element of the array to all the remaining elements, in case of a match you got your duplicate element. One solution to do so you need to use two loops (nested) where the inner loop starts with i+1 (where i is the variable of outer loop) to avoid repetitions in comparison.Exampleimport java.util.Arrays; import java.util.Scanner; public class DetectDuplcate { public static void main(String args[]) { Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array that is to be created::"); ...
Read MoreDifference between static, auto, global and local variable in C++
There are two separate concepts here − scope, which determines where a name can be accessed - global and local storage duration, which determines when a variable is created and destroyed - static and auto Scope Local variables can be used only by statements that are inside that function or block of code. Local variables are not known to functions on their own. Example #include using namespace std; int main () { // Local variable declaration: int a, b; int c; // actual initialization a = 10; b = 20; c = a + b; cout
Read MoreHow to switch data from an array to array list in java?
The Arrays class of the java.util package provides you a method named asList(). This method accepts an array (of objects) and converts them into a list and returns it.Exampleimport java.util.Arrays; import java.util.List; public class ArrayToList { public static void main(String args[]) { Integer[] myArray = {23, 93, 56, 92, 39}; List list = Arrays.asList(myArray); System.out.println(list); } }Output[23, 93, 56, 92, 39]
Read MoreWhat's the simplest way to print a Java array?
Generally, to print the contents of an array you need to use for loops, in addition to that you can directly print an array using the toString() method of this class. This method accepts an array as a parameter and returns it in String format.Exampleimport java.util.Arrays; public class PrintingArrays { public static void main(String args[]) { int[] myArray = {23, 93, 30, 56, 92, 39}; System.out.println(Arrays.toString(myArray)); } }Output[23, 93, 30, 56, 92, 39]
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