Lambda expressions In Java allows you to pass functionality as an argument to a method. You can also call an existing method using lambda expressions.list.forEach(n -> System.out.println(n));Method references are simple, easy-to-read lambda expressions to call/refer and the existing method by name in a lambda expression. In addition to the instance and static methods, you can also refer a constructor by using the new keyword.SyntaxFollowing is the syntax to reference a constructor in Java.ClassName::newExampleinterface myInterface{    Test greet(String data); } class Test{    Test(String data){          System.out.println(data);    } } public class MethodReferences {    public static void ... Read More

This method retrieves the list of all the SQL keywords of the underlying database and returns in the form of a String variable which holds all the keywords separated by commas.To get the list of keywords in the database −Make sure your database is up and running.Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user in the database, as String variables.Get the DatabaseMetaData ... Read More

Tuples in Java are an ordered collection of objects of different types. To run Tuple in Java, you need to upload an external jar file. Here, we will be using Eclipse IDE to create a new Java Project and upload the JavaTuples external jar file.The JavaTuples jar file is to be downloaded. Let us first download the jar file, create an Eclipse project and import the downloaded jar file. Here are the steps −Step 1 − Download JavaTuples Jar library and save it on your system.Open the GitHib link and download the “javatuples-1.2-dist.zip” as shown below −After downloading, unzip and ... Read More

There are five main memory areas which are used to various Java elements. Following is the list of the same. Class Area - This area contains the static members of the class. Method Area - This area contains the method definition and executable code. Heap Area - This area contains the objects which are dynamically allocated/deallocated. if an object is no more referenced by any live reference it is deallocated. Stack Area - This area contains the local variables. Pool Area - Contains immutable objects like string.

The volatile modifier is used to let the JVM know that a thread accessing the variable must always merge its own private copy of the variable with the master copy in the memory.Accessing a volatile variable synchronizes all the cached copied of the variables in the main memory. Volatile can only be applied to instance variables, which are of type object or private. A volatile object reference can be null.Examplepublic class MyRunnable implements Runnable {    private volatile boolean active;    public void run() {       active = true;       while (active) {       }    }    public void stop() {       active = false;    } }