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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to count number of characters in Text box while typing in iOS?
As an iOS developer one should know how to manipulate with text field and it’s operation, Apple has already provided UITextFieldDelegate protocol.To read more about it https://developer.apple.com/documentation/uikit/uitextfielddelegateYou may have seen may application where forms are involved, and you see number of characters you’re entering when you type specially on the forms where characters are restricted to certain count.In this post we’re going to see the same how to display the character count, when you type in TextField.Step 1 − Open Xcode → New Project → Single View Application → Let’s name it “TextFieldCount”Step 2 − Open Main.storyboard and add TextField and ...
Read MoreJava ResultSet previous() method with example
When we execute certain SQL queries (SELECT query in general) they return tabular data.The java.sql.ResultSet interface represents such tabular data returned by the SQL statements.i.e. the ResultSet object holds the tabular data returned by the methods that execute the statements which quires the database (executeQuery() method of the Statement interface in general).The ResultSet object has a cursor/pointer which points to the current row. Initially this cursor is positioned before first row.The previous() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the previous row, from the current position.This method returns a boolean value specifying whether ...
Read MoreMySQL filtering by multiple columns?
To perform filtering by multiple columns, use where clause along with OR. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(10), Score int ); Query OK, 0 rows affected (0.28 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, Score) values('John', 80); Query OK, 1 row affected (0.04 sec) mysql> insert into DemoTable(Name, Score) values('John', 90); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable(Name, Score) values('Carol', 89); Query OK, 1 row affected (0.04 sec) ...
Read MoreHow can I append text to JTextArea in Java?
To append text to JTextArea, use the component’s append() method. Let’sa say the following is our text in the JTextArea -JTextArea textArea = new JTextArea("The text added here is just for demo. "+ "This demonstrates the usage of JTextArea in Java. ");Now, append text to the same textArea -textArea.append("In this example we have deleted some text from the beginning."+ "We have also appended some text.");The following is an example to append text to JTextArea -Examplepackage my; import java.awt.GridLayout; import javax.swing.*; public class SwingDemo { SwingDemo() { JFrame frame = new JFrame("Demo"); JTextArea textArea ...
Read More8085 program to add even parity to a string of 7 bit ASCII characters.
Here we will see how to add even parity to 7-bit ASCII string using 8085.Problem StatementWrite a program to add even parity to a string of 7 bit ASCII characters. The length of the string is in memory location 8040 H and the string itself begins at memory location 8041 H. Place even parity in the most significant bit of each character.Discussion8085 has parity flat. that flag will be used to check and assign parity with each ASCII character. At first we will clear the most significant bit by masking the number with 7FH. Then use OR instruction, as this ...
Read MoreHow to Set opacity for View in iOS?
View’s Alpha value is a floating-point number in the range 0.0 to 1.0, where 0.0 represents totally transparent and 1.0 represents totally opaque. Changing the value of this property updates the alpha value of the current view only.You can simply adjust alpha value based on the opacity you want.Write the following line in you viewDidLoad methodview.backgroundColor = UIColor(white: 1, alpha: 0.5)Run the application, the view’s opacity you can see is 50%
Read MoreHow do I prevent an iOS device from going to sleep mode?
When most apps have no touches as user input for a short period, the system puts the device into a "sleep” state where the screen dims. This is done for the purposes of conserving power.Preventing iOS Device from going to sleep is easy, navigate to your Settings → Display & Brightness → Autolock, select never.This will never lock your screen.If you’re developing an iOS Application and you’re required to implement this feature, you should use isidletimerdisabled provided by apple, to read more about it https://developer.apple.com/documentation/uikit/uiapplication/1623070-isidletimerdisabledIn your viewDidLoad method write the following line of code to prevent the device from going to ...
Read MoreMySQL order from a different starting value?
Let us first create a table −mysql> create table DemoTable ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(30) ); Query OK, 0 rows affected (0.74 sec)Insert records in the table using insert command −mysql> insert into DemoTable(ClientName) values('John'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(ClientName) values('Chris'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(ClientName) values('Robert'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable(ClientName) values('David'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(ClientName) values('Bob'); Query OK, 1 row affected (0.15 sec) mysql> ...
Read MoreHow select specific rows in MySQL?
To select specific rows, use FIND_IN_SET() function in MySQL. Let us first create a table −mysql> create table DemoTable ( ListOfValues varchar(200) ); Query OK, 0 rows affected (0.31 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('112, 114, 567, Java, 345'); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable values('222, 214, 256'); Query OK, 1 row affected (0.06 sec) mysql> insert into DemoTable values('2, 567, 98, C'); Query OK, 1 row affected (0.06 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This ...
Read MoreHow to add some rows to a table through DefaultTableModel in Java
Let us first create a demo table −JTable table = new JTable(tableModel);Now, add a column to it −tableModel.addColumn("Languages");Add some rows to the table using insertRow() method −tableModel.insertRow(0, new Object[] { "CSS" }); tableModel.insertRow(0, new Object[] { "HTML5" }); tableModel.insertRow(0, new Object[] { "JavaScript" }); tableModel.insertRow(0, new Object[] { "jQuery" }); tableModel.insertRow(0, new Object[] { "AngularJS" });The following is an example to add a row to a table with DefaultTableModel −Examplepackage my; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.DefaultTableModel; public class SwingDemo { public static void main(String[] argv) throws Exception { DefaultTableModel tableModel = new DefaultTableModel(); ...
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