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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to change JFrame background color in Java
At first, create a JFrame −JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setPreferredSize(new Dimension(550, 300));Now, change the background color of the JFrame −frame.getContentPane().setBackground(Color.BLUE);The following is an example to change JFrame background color −Exampleimport java.awt.Color; import java.awt.Dimension; import javax.swing.JFrame; public class SwingDemo { public static void main(String[] args) { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setPreferredSize(new Dimension(550, 300)); frame.getContentPane().setBackground(Color.BLUE); frame.pack(); frame.setVisible(true); } }Output
Read MoreJava Program to wrap text in a JTextPane and show Scrollbar
Let’s say we have lots of content in our JTextPane component −textPane.setText("This is demo text1. This is demo text2. This is demo text3." + "This is demo text4.This is demo text5. This is demo text6. " + "This is demo text7. This is demo text8. This is demo text9. " + "This is demo text10. This is demo text11. This is demo text12." + "This is demo text13. This is demo text13. This is demo text14." + "This is demo text15. This is demo text13. This is demo text16." + " This is demo ...
Read MoreHow can I validate EditText input in Android?
This example demonstrate about How can I validate EditText input 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.java Step 3 − Add the following code to src/ValidateFilter.javapackage app.tutorialspoint.com.sample ; import android.text.InputFilter ; import android.text.Spanned ; import android.util.Log ; import java.util.regex.Matcher ; import java.util.regex.Pattern ; public class ValidateFilter implements InputFilter { @Override public CharSequence filter (CharSequence source , int start , int end , Spanned dest , int ...
Read MoreSort and Group in one MongoDB aggregation query?
For sorting and grouping in a single query, use the $group operator along with aggregate framework. Let us first create a collection with documents −> db.sortAndGroupDemo.insertOne({ Price :40, Product: 10 }); { "acknowledged" : true, "insertedId" : ObjectId("5ce8f2bc78f00858fb12e907") } > db.sortAndGroupDemo.insertOne({ Price :100, Product: 10 }); { "acknowledged" : true, "insertedId" : ObjectId("5ce8f2bc78f00858fb12e908") } > db.sortAndGroupDemo.insertOne({ Price :90, Product: 20 }); { "acknowledged" : true, "insertedId" : ObjectId("5ce8f2bc78f00858fb12e909") } > db.sortAndGroupDemo.insertOne({ Price :200, Product: 10 }); { "acknowledged" : true, "insertedId" : ObjectId("5ce8f2bc78f00858fb12e90a") } ...
Read MoreHTML DOM Input URL type Property
The HTML DOM Input URL type property returns/sets type of Input URL.SyntaxFollowing is the syntax −Returning string valueinputURLObject.typeSetting type to string valueinputURLObject.type = stringValueString ValuesHere, “stringValue” can be the following −stringValueDetailsemailIt defines that input type is emailurlIt defines that input type is urlradioIt defines that input type is radiotelIt defines that input type is tel and a number keypad is shown for inputExampleLet us see an example for Input URL type property − Live Demo Input URL type form { width:70%; margin: 0 auto; text-align: center; } ...
Read MoreFind size of text stored in a specific MySQL column?
You can use length() from MySQL to find the size of text stores in a specific column. Let us first create a tablemysql> create table DemoTable ( CustomerName longtext ); Query OK, 0 rows affected (0.67 sec)Insert records in the table using insert command −mysql> insert into DemoTable values('Robert'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output−+--------------+ | CustomerName | +--------------+ | Robert | +--------------+ 1 row in set (0.00 sec)Here is the query to find the size ...
Read MoreMySQL query to decrease the value of a specific record to zero?
Use SET to decrease the value and WHERE to set the condition for a specific record to be 0. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number int ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command &minusmysql> insert into DemoTable(Number) values(10); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(Number) values(20); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Number) values(1); Query OK, 1 row affected ...
Read MoreHow to define a MIN and MAX value for EditText in Android?
This example demonstrate about How to define a MIN and MAX value for EditText 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.java Step 3 − Add the following code to src/MinMaxFilter.javapackage app.tutorialspoint.com.sample ; import android.text.InputFilter ; import android.text.Spanned ; public class MinMaxFilter implements InputFilter { private int mIntMin , mIntMax ; public MinMaxFilter ( int minValue , int maxValue) { this . mIntMin = minValue ...
Read MoreHow to correctly use INSERT INTO … SELECT in MySQL to avoid Error 1064?
Let us first create a table −mysql> create table DemoTable1 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstName varchar(100) -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1(FirstName) values('John'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1(FirstName) values('Chris'); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;This will produce the following output −+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John ...
Read MoreIs there a MAX function for rows and not for columns in MySQL?
Yes, you can use GREATEST() from MySQL to check maximum from rows (not columns). Let us first create a table −mysql> create table DemoTable ( Value1 int, Value2 int, Value3 int ); Query OK, 0 rows affected (0.58 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(190, 395, 322); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output−+--------+--------+--------+ | Value1 | Value2 | Value3 | +--------+--------+--------+ | 190 | 395 ...
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