To set the alignment of the label content along the X axis, use the setHorizontalAlignment() method. Let us first set a label component. We have set the label background color as well so that we can check the alignment of the label’s content properly −JLabel label = new JLabel("Team "); ... Read More

You can use regular expression along with $not operator to ignore a specific character and display rest of them. Let us first create a collection with documents −> db.regexDemo.insertOne({"CustomerId":"Customer#1234", "CustomerName":"Chris"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cc7428f8f9e6ff3eb0ce436") } > db.regexDemo.insertOne({"CustomerId":"Customer5678", "CustomerName":"Robert"}); {    "acknowledged" : true,    "insertedId" ... Read More

You can use $literal operator along with aggregate framework. Let us first create a collection with documents −> db.fieldWithStaticValue.insertOne({"Name":"Larry", "Age":24}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd6554c7924bb85b3f48948") } > db.fieldWithStaticValue.insertOne({"Name":"Chris", "Age":23}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd655567924bb85b3f48949") } > db.fieldWithStaticValue.insertOne({"Name":"David", "Age":26}); {    "acknowledged" : ... Read More

To get the node at a specified index in a JTree, use the getChildAt() method. Here, we are finding the node at index 3 i.e. 4th node −node.getChildAt(3)The following is an example to get the node at a specified index in a JTree −Examplepackage my; import javax.swing.JFrame; import javax.swing.JTree; import ... Read More

You need to use changeUserPassword() to change a user’s password. Let us first create a user with some roles. Following is the query to create a user in MongoDB −> use admin switched to db admin > db.createUser( ...    { ...       user: "Chris", ...     ... Read More

To push elements to an existing array, use $addToSet operator along with update(). Let us first create a collection with documents −> db.pushElements.insertOne({"Comments":["Good", "Awesome", "Nice"]}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd682597924bb85b3f48953") }Following is the query to display all documents from a collection with the help of find() ... Read More

Here we will see the Shuffle and random_shuffle in C++. Let us see the random_shuffle first. It is used to randomly rearrange the elements in range [left, right). This function randomly swaps the positions of each element with the position of some randomly chosen positions.We can provide some random generator ... Read More

This is a C++ program to repeatedly search the same text.AlgorithmsBegin    Take the original string and pattern to be searched as input.    org_len = store the length of original string    pat_len = store the length of pattern    for i = 0 to (org_len - pat_len)   ... Read More

For this, use printjson. Let us first create a collection with documents −> db.cursorDemo.insertOne({"StudentFullName":"John Smith", "StudentAge":23}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cc7f0d08f9e6ff3eb0ce442") } > db.cursorDemo.insertOne({"StudentFullName":"John Doe", "StudentAge":21}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cc7f0df8f9e6ff3eb0ce443") } > db.cursorDemo.insertOne({"StudentFullName":"Carol Taylor", "StudentAge":20}); {    "acknowledged" : true,   ... Read More

You can use $group operator with _id: null. Following is the syntax −db.yourCollectionName.aggregate([{$group: {_id:null, "anyFieldName": {$avg:"$yourFieldName"} } }]);Let us first create a collection with documents −> db.caculateTheAverageValueDemo.insertOne({"Population":100}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd68a197924bb85b3f4895f") } > db.caculateTheAverageValueDemo.insertOne({"Population":500}); {    "acknowledged" : true,    "insertedId" : ObjectId("5cd68a1c7924bb85b3f48960") } > ... Read More