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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to create date object in Java?
Using the Date classYou can create a Date object using the Date() constructor of java.util.Date constructor as shown in the following example. The object created using this constructor represents the current time.Exampleimport java.util.Date; public class CreateDate { public static void main(String args[]) { Date date = new Date(); System.out.print(date); } }OutputThu Nov 02 15:43:01 IST 2018Using the SimpleDateFormat classUsing the SimpleDateFormat class and the parse() method of this you can parse a date string in the required format and create a Date object representing the specified date.Exampleimport java.text.ParseException; import java.text.SimpleDateFormat; ...
Read MoreHow to get a value from the cell of a Pandas DataFrame?
To get a value from the cell of a DataFrame, we can use the index and col variables.StepsCreate a two-dimensional, size-mutable, potentially heterogeneous tabular data, df.Print the input DataFrame, df.Initialize the index variable.Initialize the col variable.Get the cell value corresponding to index and col variable.Print the cell value.Exampleimport pandas as pd df = pd.DataFrame( { "x": [5, 2, 1, 9], "y": [4, 1, 5, 10], "z": [4, 1, 5, 0] } ) print("Input DataFrame is:", df) index = 2 col = "y" cell_val = df.iloc[index][col] print "Cell ...
Read MoreHow to select all columns except one in a Pandas DataFrame?
To select all columns except one column in Pandas DataFrame, we can use df.loc[:, df.columns != ].StepsCreate a two-dimensional, size-mutable, potentially heterogeneous tabular data, df.Print the input DataFrame, df.Initialize a variable col with column name that you want to exclude.Use df.loc[:, df.columns != col] to create another DataFrame excluding a particular column.Print the DataFrame without col column.Exampleimport pandas as pd df = pd.DataFrame( { "x": [5, 2, 1, 9], "y": [4, 1, 5, 10], "z": [4, 1, 5, 0] } ) print("Input DataFrame is:", df) col = ...
Read More4 Keys Keyboard in C++
Suppose we will try to write the letter ‘A’, using the keyboard. Our goal is to use only four keys and try to write maximum ‘A’s on the text field. The keys are ‘A’, ‘C’, ‘V’, and ‘Ctrl’. To write a maximum number of A, we will use Ctrl + A to select All, Ctrl + C to copy, and Ctrl + V to paste. So, if the input is like the number of keystrokes is 7 then the output will be 9 as of press A three times. Then Ctrl+A, Ctrl+C, Ctrl+V, Ctrl+V To solve this, we will follow ...
Read MoreRead/Write Class Objects from/to File in C++
The iostream standard library has two methods cin, to accept input from standard input stream and cout to print output to the standard output stream. In this article we will learn how to read data from files into class objects and how to write data in class objects to files.Reading and writing data to and from files requires another standard library of C++ . The three main data types of fstream are −ifstream − represents input file stream and reads information from files.ofstream − represents output file stream and writes information to files.fstream − represents general file stream and has ...
Read MoreJava program for Multiplication of Array elements
To find the product of elements of an array.create an empty variable. (product)Initialize it with 1.In a loop traverse through each element (or get each element from user) multiply each element to product.Print the product.Exampleimport java.util.Arrays; import java.util.Scanner; public class ProductOfArrayOfElements { public static void main(String args[]){ System.out.println("Enter the required size of the array :: "); Scanner s = new Scanner(System.in); int size = s.nextInt(); int myArray[] = new int [size]; int product = 1; System.out.println("Enter the elements of the array one by one "); for(int i=0; i
Read MoreMultiple inheritance by Interface in Java
An interface contains variables and methods like a class but the methods in an interface are abstract by default unlike a class. Multiple inheritance by interface occurs if a class implements multiple interfaces or also if an interface itself extends multiple interfaces.A program that demonstrates multiple inheritance by interface in Java is given as follows:Exampleinterface AnimalEat { void eat(); } interface AnimalTravel { void travel(); } class Animal implements AnimalEat, AnimalTravel { public void eat() { System.out.println("Animal is eating"); } public void travel() { System.out.println("Animal is travelling"); } ...
Read MorePrint a 2D Array or Matrix in Java
In this post we will try to print an array or matrix of numbers at console in same manner as we generally write on paper.For this the logic is to access each element of array one by one and make them print separated by a space and when row get to end in matrix then we will also change the row.Examplepublic class Print2DArray { public static void main(String[] args) { final int[][] matrix = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } }; for (int i = 0; i
Read MoreConcatenate string to an int value in Java
To concatenate a string to an int value, use the concatenation operator.Here is our int.int val = 3;Now, to concatenate a string, you need to declare a string and use the + operator.String str = "Demo" + val;Let us now see another example.Exampleimport java.util.Random; public class Demo { public static void main( String args[] ) { int val = 3; String str = "" + val; System.out.println(str + " = Rank "); } }Output3 = Rank
Read MoreGenerate a random array of integers in Java
In order to generate random array of integers in Java, we use the nextInt() method of the java.util.Random class. This returns the next random integer value from this random number generator sequence.Declaration − The java.util.Random.nextInt() method is declared as follows −public int nextInt()Let us see a program to generate a random array of integers in Java −Exampleimport java.util.Random; public class Example { public static void main(String[] args) { Random rd = new Random(); // creating Random object int[] arr = new int[5]; for (int i = 0; i
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