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Set the selection mode to SINGLE_TREE_SELECTION, if you want only a single tree node to be selected −tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);The following is an example to allow only a single tree node to be selected in a JTree −Examplepackage my; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; import javax.swing.tree.TreeSelectionModel; public class SwingDemo { public static void main(String[] args) throws Exception { JFrame frame = new JFrame("Demo"); DefaultMutableTreeNode node = new DefaultMutableTreeNode("Products"); DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Clothing"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Electronics"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("Home Decor"); ... Read More
To automatically resize a JTree, use the setVisibleRowCount() method in Java. At first, create a node in the tree −DefaultMutableTreeNode node = new DefaultMutableTreeNode("Project");Now, add nodes to the node created above −DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("App"); DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Website"); DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("WebApp"); node.add(node1); node.add(node2); node.add(node3);Now, create more nodes and set them as child nodes for the nodes we creted above −DefaultMutableTreeNode one = new DefaultMutableTreeNode("Learning website"); DefaultMutableTreeNode two = new DefaultMutableTreeNode("Business website"); DefaultMutableTreeNode three = new DefaultMutableTreeNode("News publishing website"); DefaultMutableTreeNode four = new DefaultMutableTreeNode("Android app"); DefaultMutableTreeNode five = new DefaultMutableTreeNode("iOS app"); DefaultMutableTreeNode six = new DefaultMutableTreeNode("Editor ... Read More
Use find() with dot notation to perform recursive search. Let us first create a collection with documents −> db.findOperationDemo.insertOne({"ClientDetails":[{"ClientId":101, "ClientName":"Chris"}, {"ClientId":102, "ClientName":"Robert"}]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9a118b50a6c6dd317ad99") } > db.findOperationDemo.insertOne({"ClientDetails":[{"ClientId":110, "ClientName":"David"}, {"ClientId":112, "ClientName":"Mike"}]}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9a12fb50a6c6dd317ad9a") }Following is the query to display all documents from a collection with the help of find() method −> db.findOperationDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd9a118b50a6c6dd317ad99"), "ClientDetails" : [ { "ClientId" : 101, "ClientName" : "Chris" ... Read More
The HTML DOM Input Date autofocus property sets/returns whether Input Date is focused upon initial page load.SyntaxFollowing is the syntax −Returning boolean value - true/falseinputDateObject.autofocusSetting autofocus to booleanValueinputDateObject.autofocus = booleanValueBoolean ValueHere, “booleanValue” can be the following −booleanValueDetailstrueIt defines that input will be autofocused on page load.falseIt is the default value and input is not autofocused.ExampleLet us see an example of Input Date autofocus property − Live Demo Input Date Autofocus Date Select: Remove Auto Focus var divDisplay = document.getElementById("divDisplay"); var inputDate = document.getElementById("Date"); divDisplay.textContent = 'Autofocus: '+inputDate.autofocus function removeAutoFocus() { ... Read More
The HTML DOM Input Time readOnly property sets/returns whether Input Time can be modified or not.SyntaxFollowing is the syntax −Returning boolean value - true/falseinputTimeObject.readOnlySetting readOnly to booleanValueinputTimeObject.readOnly = booleanValueBoolean ValuesHere, “booleanValue” can be the following −booleanValueDetailstrueIt defines that the input time field is readOnly.falseIt defines that the input time field is not readOnly and can be modified.ExampleLet us see an example of Input Time readOnly property − Live Demo Input Time readOnly form { width:70%; margin: 0 auto; text-align: center; } * { padding: 2px; ... Read More
Everybody loves to write reusable code, right? Then partial function is a cool thing to learn. Partial functions allows us to derive a function with x parameters to a function with fewer parameters and constant values set for the more limited function.We can write partial functional application in python through functools library. Below is a simple example of partial function from the functools library with the add function from the operator library.>>> from functools import * >>> from operator import * >>> add(1, 2) 3 >>> add1 = partial(add, 4) >>> add1(6) 10 >>> add1(10) 14Partial is a higher order ... Read More
Here we will see some incompatibilities between C and C++. Some C codes that can be compiled using C compiler, but does not compile in C++ compiler. And also returns error.We can define function using a syntax, that optionally specify the argument types after the argument list.Example#include void my_function(x, y)int x;int y; { // Not valid in C++ printf("x = %d, y = %d", x, y); } int main() { my_function(10, 20); }Outputx = 10, y = 20OutputError in C++ :- x and y was not declared in this scopeIn C, or some older version of C++, the ... Read More
Whenever we execute SQL statements using the executeQuery() method, it returns a ResultSet object which holds the tabular data returned by the SELECT queries(in general).The ResultSet object contains a cursor/pointer which points to the current row. Initially this cursor is positioned before first row (default position).You can move the cursor of the ResultSet object to the next row from the current position, using the next() method of the ResultSet interface.rs.next()This method returns a boolean value specifying whether the ResultSet object contains more rows.If there are no rows next to its current position this method returns false, else it returns true.Let us create ... Read More
Use DISTINCT for distinct elements and then length to get the size of array −db.yourCollectionName.distinct('yourFieldName').length;Let us first create a collection with documents −> db.countOrSizeDemo.insertOne({"StudentFirstName":"John"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd304f5b64f4b851c3a13dc") } > db.countOrSizeDemo.insertOne({"StudentFirstName":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd304fab64f4b851c3a13dd") } > db.countOrSizeDemo.insertOne({"StudentFirstName":"David"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd304fcb64f4b851c3a13de") } > db.countOrSizeDemo.insertOne({"StudentFirstName":"Carol"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd30500b64f4b851c3a13df") } > db.countOrSizeDemo.insertOne({"StudentFirstName":"Sam"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd30505b64f4b851c3a13e0") } > db.countOrSizeDemo.insertOne({"StudentFirstName":"John"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd3050ab64f4b851c3a13e1") }Following is the query to display all ... Read More
Let us first create a collection with documents wherein one of the fields is StudentName −> db.lowerCaseDemo.insertOne({"StudentName":"JOHN SMith"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9a86fb50a6c6dd317ad9f") } > db.lowerCaseDemo.insertOne({"StudentName":"CAROL TAYLor"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9a88fb50a6c6dd317ada0") } > db.lowerCaseDemo.insertOne({"StudentName":"DAVID Miller"}); { "acknowledged" : true, "insertedId" : ObjectId("5cd9a89fb50a6c6dd317ada1") }Following is the query to display all documents from a collection with the help of find() method −> db.lowerCaseDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd9a86fb50a6c6dd317ad9f"), "StudentName" : "JOHN SMith" } { "_id" : ObjectId("5cd9a88fb50a6c6dd317ada0"), "StudentName" : "CAROL TAYLor" } { ... Read More