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Articles by Ramu Prasad
Page 3 of 5
How to convert JSON Array to normal Java Array?
The get method of the JSONArray class returns the element at a particular index. Using this method, you can get the elements of the JSONArray object and populate the array with them.Exampleimport java.util.Arrays; import org.json.JSONArray; public class JsonToArray { public static void main(String args[]) throws Exception { String [] myArray = {"JavaFX", "HBase", "JOGL", "WebGL"}; JSONArray jsArray = new JSONArray(); for (int i = 0; i < myArray.length; i++) { jsArray.put(myArray[i]); } System.out.println(jsArray); String[] array = new String[myArray.length]; ...
Read MoreHow to declare Java array with array size dynamically?
To declare array size dynamically read the required integer value from the user using Scanner class and create an array using the given value:Exampleimport java.util.Arrays; import java.util.Scanner; public class PopulatingAnArray { 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]; System.out.println("Enter the elements of the array one by one "); for(int i = 0; i
Read MoreHow to convert an array of objects to an array of their primitive types in java?
Apache Commons provides a library named org.apache.commons.lang3 and, following is the maven dependency to add the library to your project. org.apache.commons commons-lang3 3.0 This package provides a class named ArrayUtils. Using the toPrimitive() method of this class you can convert An object array to an array of primitive types:Exampleimport java.util.Arrays; import org.apache.commons.lang3.ArrayUtils; public class ArraysToPrimitives { public static void main(String args[]) { Integer[] myArray = {234, 76, 890, 27, 10, 63}; int[] primitiveArray = ArrayUtils.toPrimitive(myArray); System.out.println(Arrays.toString(primitiveArray)); } }Output[234, 76, 890, 27, 10, 63]
Read MoreHow MySQL stored function evaluates if it got NULL value while using the dynamic values from a table?
In such kind of cases when a stored function got NULL values then it will return NULL as the result. It can be understood from the example below in which we have a NULL value in the records of student ‘Mohit’. Now, when we will apply the stored function ‘avg_marks’ on this data, it will return NULL as result.mysql> Select * from Student_marks; +-------+------+---------+---------+---------+ | Name | Math | English | Science | History | +-------+------+---------+---------+---------+ | Raman | 95 | 89 | 85 | 81 | | Rahul | 90 | ...
Read MoreTokenize a string in C++?
First way is using a stringstream to read words seperated by spaces. This is a little limited but does the task fairly well if you provide the proper checks. example#include #include #include using namespace std; int main() { string str("Hello from the dark side"); string tmp; // A string to store the word on each iteration. stringstream str_strm(str); vector words; // Create vector to hold our words while (str_strm >> tmp) { // Provide proper checks here for tmp like if empty // ...
Read MoreWhy can C++ templates only be implemented in the header file?
When you instantiate a template in C++, the compiler creates a new class. This class has all the places where you placed the template arguments replaced with the actual argument you pass to it when using it. For example −template class MyClass { T foo; T myMethod(T arg1, T arg2) { // Impl } };And somewhere in your program use this class, MyClass x;The compiler creates a new class upon encountering this for every type argument you pass it. For example, if you created 3 objects with different template arguments you'll get 3 classes, ...
Read MoreHow can we analyze the tables of a particular database from MySQL Server command line?
We need to use ‘mysqlcheck’ client program along with –analyze option to analyze the tables of a particular database. Its syntax would be as follows −Mysqlcheck – u root –analyze db_nameExampleThe following command will analyze the tables of database ‘query’ −C:\mysql\bin>mysqlcheck -u root --analyze query query.cars OK query.copy_cars OK query.countries Table is already up to date query.customers ...
Read MoreHow MySQL evaluates the blank line between two lines written in the text file while importing that text file into MySQL table?
Suppose if there is a blank line between two line written in the text file then MySQL evaluates it as the data line while importing that text file into MySQL table. It can be understood with the help of the following example −ExampleSuppose we are having a blank line between two lines in a text file named ‘A.txt’ as follows −105, Chum, USA, 11000 106, Danny, AUS, 12000Now we can write the following query to import the data from text file into MySQL table −mysql> LOAD DATA LOCAL INFILE 'd:\A.txt' INTO table employee10_tbl FIELDS TERMINATED BY ', '; Query OK, ...
Read MoreUsage of color property in CSS
The color property is used to set the color of text. You can try to run the following code to learn how to work with the color property in CSS:Example This text will be written in blue.
Read MoreSet the Background Attachment with CSS
To set the background-attachment, use the background-attachment property. Background attachment determines whether a background image is fixed or scrolls with the rest of the page.ExampleYou can try to run the following code to learn how to work with the background-attachment property to set fixed background image: body { background-image: url('/css/images/css.jpg'); background-repeat: no-repeat; background-attachment: fixed; } The ...
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