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Articles on Trending Technologies
Technical articles with clear explanations and examples
Can 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] ...
Read Morestring.sub() function in Lua
Another important function of the Lua’s string library is the string.sub() function. The string.sub() function is used to extract a piece of the string.The string.sub() function takes three arguments in general, the first argument being the name of the string from which we want to extract a piece, the second argument is the i-th index or say, the starting index of the string piece that we want, and the third and the last argument is the j-th index of the last index of the string piece we want.It should be noted that both the starting index and the ending index, ...
Read MoreHow to remove a character in an R data frame column?
To remove a character in an R data frame column, we can use gsub() function which will replace the character with blank. For example, if we have a data frame called df that contains a character column say x which has a character ID in each value then it can be removed by using the command gsub("ID", "", as.character(df$x)).Example1Consider the below data frame −> x1 x2 df1 df1Output x1 x2 1 Male1 8 2 Female1 4 3 Male1 9 4 Male1 2 5 Male1 7 6 Female1 5 7 Male1 3 8 ...
Read MoreHow to convert more than one column in R data frame to from integer to numeric in a single line code?
To convert columns of an R data frame from integer to numeric we can use lapply() function. For example, if we have a data frame df that contains all integer columns then we can use the code lapply(df,as.numeric) to convert all of the columns data type into numeric data type.Example1Consider the below data frame −set.seed(871) x1
Read MoreDifference between HashMap and HashSet in Java.
HashMap and HashSet both are one of the most important classes of Java Collection framework.Following are the important differences between HashMap and HashSet.Sr. No.KeyHashMapHashSet1ImplementationHashmap is the implementation of Map interface.Hashset on other hand is the implementation of set interface.2Internal implementationHashmap internally do not implements hashset or any set for its implementation.Hashset internally uses Hashmap for its implementation.3Storage of elementsHashMap Stores elements in form of key-value pair i.e each element has its corresponding key which is required for its retrieval during iteration.HashSet stores only objects no such key value pairs maintained.4Method to add elementPut method of hash map is used to ...
Read MoreC++ Stream Classes Structure
In C++ stream refers to the stream of characters that are transferred between the program thread and i/o.Stream classes in C++ are used to input and output operations on files and io devices. These classes have specific features and to handle input and output of the program.The iostream.h library holds all the stream classes in the C++ programming language.Let's see the hierarchy and learn about them, Now, let’s learn about the classes of the iostream library.ios class − This class is the base class for all stream classes. The streams can be input or output streams. This class defines members that ...
Read MoreJava Program to count letters in a String
Let’s say we have the following string, that has some letters and numbers.String str = "9as78";Now loop through the length of this string and use the Character.isLetter() method. Within that, use the charAt() method to check for each character/ number in the string.for (int i = 0; i < str.length(); i++) { if (Character.isLetter(str.charAt(i))) count++; }We have set a count variable above to get the length of the letters in the string.Here’s the complete example.Examplepublic class Demo { public static void main(String []args) { String str = "9as78"; int count = ...
Read MoreC Program for LowerCase to UpperCase and vice-versa
Here is the program to convert a string to uppercase in C language,Example#include #include int main() { char s[100]; int i; printf("Enter a string : "); gets(s); for (i = 0; s[i]!='\0'; i++) { if(s[i] >= 'a' && s[i] = 'a' && s[i] = 'A' && s[i] = 'A' && s[i]
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