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Articles on Trending Technologies
Technical articles with clear explanations and examples
What is the difference between integer and floating point literals in Java?
Integer literals represent fixed integer values like 900, 12, 400, -222 etc. (with in the integer range). Whereas, floating point literals represents fractional values i.e. numbers with decimal values like 25.53, 45.66, 58.66 etc. while writing these literals we should use the notation f or F as 25.53. Example public class StringExample { public static void main(String args[]){ int num1 = 100; float num2 = 30.0f; System.out.println("Value of integer:"+num1); System.out.println("Value of integer:"+num2); } } Output Value of integer:100 Value of integer:30.0
Read MoreWhat is the difference between character literals and string literals in Java?
Character literals represents alphabets (both cases), numbers (0 to 9), special characters (@, ?, & etc.) and escape sequences like , \b etc. Whereas, the String literal represents objects of String class. Example public class LiteralsExample { public static void main(String args[]){ char ch = 'H'; String str = "Hello"; System.out.println("Value of character: "+ch); System.out.println("Value of string: "+str); } } Output Value of character: H Value of string: Hello
Read MoreHow to validate email using jQuery?
To validate email using jQuery, use the regex pattern. You can try to run the following code to learn how to validate email using jQuery −Example $(document).ready(function() { $('.error').hide(); $('#submit').click(function(){ var name = $('#name').val(); var email = $('#email').val(); if(name== ''){ $('#name').next().show(); return false; } if(email== ''){ $('#email').next().show(); ...
Read MoreHow can I put a Java arrays inside an array?
Exampleimport java.util.Arrays; public class ArrayWithinAnArray{ public static void main(String args[]) { int[] myArray1 = {23, 56, 78, 91}; int[] myArray2 = {123, 156, 178, 191}; int[] myArray3 = {223, 256, 278, 291}; int[] myArray4 = {323, 356, 378, 391}; int [][] arrayOfArrays = {myArray1, myArray2, myArray3, myArray4}; System.out.println(Arrays.deepToString(arrayOfArrays)); } }Output[[23, 56, 78, 91], [123, 156, 178, 191], [223, 256, 278, 291], [323, 356, 378, 391]]
Read MoreWhat is the lambda expression to convert array/List of String to array/List of Integers in java?
You can convert an array list of strings to an array list of integers as:Exampleimport java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; public class LamdaExpressions { public static void main(String args[]) { ArrayList list = new ArrayList(); list.add("123"); list.add("223"); list.add("323"); list.add("334"); List listInteger = list.stream().map(s -> Integer.parseInt(s)).collect(Collectors.toList()); System.out.println(listInteger); } }Output[123, 223, 323, 334]
Read MoreWhat are the default values of instance variables whether primitive or reference type in Java?
When we haven’t initialized the instance variables compiler initializes them with default values.For boolean type, the default value is false, for float and double types default values are 0.0 and for remaining primitive types default value is 0.Examplepublic class Sample { int varInt; float varFloat; boolean varBool; long varLong; byte varByte; short varShort; double varDouble; public static void main(String args[]){ Sample obj = new Sample(); System.out.println("Default int value ::"+obj.varInt); System.out.println("Default float value ::"+obj.varFloat); System.out.println("Default boolean value ::"+obj.varBool); ...
Read MoreWhat is a method signature in Java?
The method signature consists of the method name and the parameter list. Example public class MethodSignature { public int add(int a, int b){ int c = a+b; return c; } public static void main(String args[]){ MethodSignature obj = new MethodSignature(); int result = obj.add(56, 34); System.out.println(result); } } Output 90 Method signature does not ...
Read MoreCan static variables be called using className.variableName in Java?
Class variables also known as static variables are declared with the static keyword There would only be one copy of each class variable per class, regardless of how many objects are created from it. You can access a class variable without instantiation using the class name as className.variableName. Example public class Test{ static int num = 92; public static void main(String args[]) throws Exception { System.out.println(Test.num); } } Output 92
Read MoreWhat is the difference between jQuery.animate() and jQuery.hide()?
jQuery animate() The animate( ) method performs a custom animation of a set of CSS properties. Here is the description of all the parameters used by this method − params − A map of CSS properties that the animation will move toward. duration − This is optional parameter representing how long the animation will run. easing − This is optional parameter representing which easing function to use for the transition. callback − This is optional parameter representing a function to call once the animation is complete. You can try to run the following code to learn how to ...
Read MoreHow to solve the simultaneous linear equations in R?
The data in simultaneous equations can be read as matrix and then we can solve those matrices to find the value of the variables. For example, if we have three equations as −x + y + z = 6 3x + 2y + 4z = 9 2x + 2y – 6z = 3then we will convert these equations into matrices and solve them using solve function in R.Example1> A AOutput [, 1] [, 2] [, 3] [1, ] 1 1 2 [2, ] 3 2 4 [3, ] 2 3 -6> b bOutput[, 1] ...
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