How to know the current selected database in mysql
Requirement Knowing the current selected database becomes very important when there are more than one databases created and you want to know on which database your queries were executed or…
How to declare and initialize array in java / Everything about arrays in java
What is an Array? An array is a group of elements of similar data type. Array elements can be either primitives(such as int, float, double) or objects(such as String, Person,…
How to print an array in java / Various ways to print an array in java
An array is an object in java. If you try to print it by simply supplying it to System.out.print statement, is is printed as just like any other object. Example,…
How to clone or copy a list in python / Various methods of making a copy of list in python
A list in python is a collection of elements of same or different types and is created by enclosing the elements inside square brackets. Often you need to make a…
What is NullPointerException in java
java.lang.NullPointerException is the most commonly encountered exceptions while execution of applications written in java. All java programmers are haunted by this exception since it mostly arises due to incorrect handling…
How to compare two strings in java / Various methods of string comparison in java
Comparing two strings is a commonly used operation performed by all java programmers. In fact, there would not be a single programmer who has not compared two string values. There…
How to resolve “core_1.PriorityQueue is not a constructor” in angular when creating a component or module
If you are generating angular component or module from angular cli using command ng g m [module name] and you get the error trace as below TypeError: core_1.PriorityQueue is not…
How to hide child elements in jQuery
Assume you have a parent element with multiple child elements. On some event such as a button click, you want to hide all the children of this element at once…
How to resolve “java.sql.SQLNonTransientConnectionException: Public Key Retrieval is not allowed” error in java
If you are connecting to MySQL version 8 from your java application, there are bright chances that you might have come across the following error java.sql.SQLNonTransientConnectionException: Public Key Retrieval is…