The addIfAbsent() method appends the element if it is not in the list. If the element is already in the list, then FALSE is returned.The syntax is as follows.public boolean addIfAbsent(E ele)Here, ele is the element to be added to this list, if it is not already in the list.To ... Read More

This example demonstrate about How to get default phone MmsUserAgent in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml.     In the above ... Read More

You need to use insert() for this. Whenever you insert custom _id values and the document already exist with the custom _id value then an error is visible. Let us first create a collection with documents. Under this, we tried adding the same document again and this resulted in an error> ... Read More

A class constructor is a special member function of a class that is executed whenever we create new objects of that class.A constructor will have exact same name as the class and it does not have any return type at all, not even void. Constructors can be very useful for ... Read More

Let us first create a table. The query to create a table is as followsmysql> create table selectAllDemo - > ( - > Name varchar(100), - > Age int - > ); Query OK, 0 rows affected (1.90 ... Read More

Following is the syntax to return only a single property _id in MongoDBdb.yourCollectionName.find({}, {"_id": 1}).pretty();Let us first create a collection with documents> db.singlePropertyIdDemo.insertOne({"_id":101, "UserName":"Larry", "UserAge":21}); { "acknowledged" : true, "insertedId" : 101 } > db.singlePropertyIdDemo.insertOne({"_id":102, "UserName":"Mike", "UserAge":26}); { "acknowledged" : true, "insertedId" : 102 } > db.singlePropertyIdDemo.insertOne({"_id":103, "UserName":"Chris", "UserAge":24}); { ... Read More

The syntax is as follows to rename Root @localhostUPDATE MySQL.user SET user = ‘yourNewRootName’ WHERE user = 'root';To understand the above concept, let us check all the user names and host. The query is as followsmysql> select user, host from MySQL.user;The following is the output+------------------+-----------+ | user       ... Read More

The toString() method of the AbstractCollection class is used to return the string representation of the elements of this collection.The syntax is as followspublic String toString()To work with AbstractCollection class in Java, import the following packageimport java.util.AbstractCollection;The following is an example to implement AbstractCollection toString() method in JavaExample Live Demoimport java.util.ArrayList; ... Read More

The anyMatch() method of the LongStream class in Java returns whether any elements of this stream match the provided predicate.The syntax is as follows.boolean anyMatch(LongPredicate predicate)Here, the parameter predicate is the stateless predicate to apply to elements of this stream. The LongPredicate represents a predicate of one long-valued argument.To use ... Read More

To find oldest/youngest post in MongoDB collection, you can use sort(). Let’s say you have a document with a field “UserPostDate” and you need to get the oldest and youngest post. For that, Let us first create a collection with documents>db.getOldestAndYoungestPostDemo.insertOne({"UserId":"Larry@123", "UserName":"Larry", "UserPostDate":new ISODate('2019-03-27 12:00:00')}); {    "acknowledged" : true, ... Read More