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Articles by George John
Page 79 of 79
When is a semicolon after } mandated in C++ Program?
A semicolon after a close brace is mandatory if this is the end of a declaration. In case of braces, they have used in declarations of class, enum, struct, and initialization syntax. At the end of each of these statements, we need to put a semicolon. For example, class X {}; // same declaration for struct as well enum Y {}; int z[] = {1, 2}; A semicolon by itself is an empty statement, and you'll be able to add additional ones anywhere a statement is legal. Therefore it might be legal to place a ...
Read MoreHow to add a Favicon to Your WordPress Site?
A favicon is a little icon visible on the web browser tab, just before the page title. It is generally a logo with the smaller size. You need to include a Site Icon in WordPress to add a favicon to your WordPress site. Login to your WordPress website and from the left menu; click Appearance, and then Customize − After that, you will reach the Theme Customization section. Under that, the first sub-section is Site Identity. From there, you need to go to the Site Icon and upload the icon. The size here is 512x512, from which the ...
Read MoreAtomic variables in Java
Yes, from Java 8 onwards, java.util.concurrent.atomic package contains classes which support atomic operations on single variables preventing race conditions or do not face synchronization issues. All classes in the atomic package have get/set methods. Each set method has a happens-before relationship with any subsequent get() method call on the same variable. import java.util.concurrent.atomic.AtomicInteger; class AtomicCounter { private AtomicInteger counter = new AtomicInteger(0); public void increment() { counter.incrementAndGet(); } public void decrement() { counter.decrementAndGet(); } public int value() { return counter.get(); } }
Read MoreJava Variable Narrowing Example
Narrowing refers to passing a higher size data type like int to a lower size data type like short. It may lead to data loss. Casting is required for narrowing conversion. Following program output will be 44. public class MyFirstJavaProgram { public static void main(String []args) { int a = 300; byte b = (byte)a; // narrowing System.out.println(b); } }
Read MoreHow MySQL SUM() function evaluates if the column having NULL values too?
Suppose if we are calculating the sum of the values of a column which also have NULL values then MySQL SUM() function ignores the NULL values and does the sum of the rest of the values. To understand it, consider the following example of table ‘employee’, having following details − mysql> Select * from Employee; +----+--------+--------+ | ID | Name | Salary | +----+--------+--------+ | 1 | Gaurav | 50000 | | 2 | Rahul | 20000 | | 3 | Advik | 25000 | | 4 | ...
Read MoreWhy is it not recommended to use the mixture of quoted as well as unquoted values in MySQL IN() function's list?
Actually, MySQL has different comparison rules for quoted values such as strings and unquoted values such as numbers. On mixing the quoted and unquoted values in IN() function list may lead to the inconsistent result set. For example, we must not write the query with IN() function like below − Select Salary from employee where ID IN(1,’a’,2,3,’c’) Instead of this the better way to write the above query is as follows − Select Salary from employee where ID IN(‘1’,’a’,’2’,’3’,’c’)
Read MoreHow many ways a String object can be created in java?
You can create a String by − Step 1 − Assigning a string value wrapped in " " to a String type variable. String message = "Hello Welcome to Tutorialspoint"; Step 2 − Creating an object of the String class using the new keyword by passing the string value as a parameter of its constructor. String message = new String ("Hello Welcome to Tutorialspoint"); Step 3 − Passing a character array to the String constructor. char arr[] = {'H','e','l','l','o'}; String message = new String(arr);
Read MoreHow to create a string from a Java ArrayList?
To convert the contents of an ArrayList to a String, create a StringBuffer object append the contents of the ArrayList to it, finally convert the StringBuffer object to String using the toString() method. Example import java.util.ArrayList; public class String_ArrayList { public static void main(String args[]) { ArrayList al = new ArrayList(); al.add("Hello"); al.add("are"); al.add("you"); StringBuffer sb = new StringBuffer(); for (String s : al) { sb.append(s); sb.append(" "); } String str = sb.toString(); System.out.println(str); } } Output Hello are you
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