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Yes, it's possible to assign a numeric value to an enum.Enum in Java is used to represent a list of predefined values. Most of the time, we probably not care about the associated value of an enum. However, there might be some times when we need to assign specific values to an enum.Example:import java.util.Enumeration; import java.util.Vector; public class EnumerationExample { public static void main(String[] args) { Vector vec = new Vector(4); vec.add(4); vec.add(3); vec.add(2); vec.add(1); Enumeration e = vec.elements(); ... Read More
Let us first create a panel and set some buttons −JPanel panel = new JPanel(); JButton btn1 = new JButton("One"); JButton btn2 = new JButton("Two"); JButton btn3 = new JButton("Three"); JButton btn4 = new JButton("Four"); JButton btn5 = new JButton("Five"); panel.add(btn1); panel.add(btn2); panel.add(btn3); panel.add(btn4); panel.add(btn5);Now, use the setAlignmentX() and within that specify alignment to the center of the component −panel.setAlignmentX(Component.CENTER_ALIGNMENT);The following is an example to center align component using BoxLayout −Examplepackage my; import java.awt.Component; import java.awt.Dimension; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; public class SwingDemo { public static void main(String[] args) { ... Read More
The strokeStyle property in HTML canvas is used to set the color, gradient or pattern for the stroke. The element allows you to draw graphics on a web page using JavaScript. Every canvas has two elements that describes the height and width of the canvas i.e. height and width respectively.Following is the syntax −context.strokeStyle=color|gradient|pattern;Above, the values, include −color − The stroke color of the drawing.gradient − Linear or radial gradient object to create gradient strokepattern − The pattern object to create pattern stroke.Let us now see an example to implement the strokeStyle property of canvas −Example Live Demo ... Read More
Calculating number of vowels in a stringVowels in English language are a, e, i, o and u. Make sure that, in any string these vowels can be both cases ( either small or capital). DebriefThe following example, using a user defined function called 'noOfVowels()', reads an input string and compares that string with another string which contains only vowels( 'aAeEiIoOuU'). It takes the help of indexOf() method to proceed the task. The indexOf() method displays index of a character whenever the character is common to both the strings, in unmatched case it displays '-1' as the output. Here it compares each and ... Read More
Overloading is a one of the mechanisms to achieve polymorphism where, a class contains two methods with same name and different parameters.Whenever you call this method the method body will be bound with the method call based on the parameters.Overloading private methodsYes, we can overload private methods in Java but, you can access these from the same class.Example Live Demopublic class Calculator { private int addition(int a , int b){ int result = a+b; return result; } private int addition(int a , int b, int c){ int result = ... Read More
To delete all rows older than 30 days, you need to use the DELETE with INTERVAL. Use < now() i.e. less than operator to get all the records before the current date.Let us first create a table −mysql> create table DemoTable -> ( -> UserMessage text, -> UserMessageSentDate date -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Hi', '2019-06-01'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Hello', '2019-07-02'); Query OK, 1 row affected (0.14 sec) mysql> insert ... Read More
The HTML DOM input checkbox checked property returns and alter the value of checked attribute of a checkbox in HTML.syntaxFollowing is the syntax −1. Returning checkedobject.checked2. Altering checkedobject.checked = true|falseExampleLet us see an example of HTML DOM Input Checkbox checked property − Live Demo HTML DOM checked property body{ text-align:center; } p{ font-size:1.5rem; color:#ff8741; } input{ width:30px; height:30px; } button{ background-color:#db133a; color:#fff; padding:8px; border:none; ... Read More
The HTML DOM Input DatetimeLocal step property determines the legal intervals for seconds or milliseconds.SyntaxFollowing is the syntax −Returning number valueinputDatetimeLocalObject.stepSetting step attribute to a number valueinputDatetimeLocalObject.step = numberParametersParameter number values −ValueDescriptionsecondsvalid values constitute of those numbers that divide 60 perfectly (eg: 10, 15, 20)millisecondsvalid values start with “.” and divide 1000 perfectly (eg: .10, .20, .01)ExampleLet us see an example of Input DatetimeLocal step property − Live Demo Input DatetimeLocal step form { width:70%; margin: 0 auto; text-align: center; } * { ... Read More
The HTML DOM KeyboardEvent metaKey property returns the Boolean value (true/false) corresponding to if meta key was pressed using an event or not.SyntaxFollowing is the syntax −Returning booleanValue −event.metaKeyExampleLet us see an example for KeyboardEvent metaKey property − Live Demo KeyboardEvent metaKey form { width:70%; margin: 0 auto; text-align: center; } * { padding: 2px; margin:5px; } input[type="button"] { border-radius: 10px; } KeyboardEvent-metaKey Editor: I Dare you ... Read More
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 beforeFirst() method of the ResultSet interface moves the pointer of the current (ResultSet) object to the default position (before first), from the current position.Statement stmt = con.createStatement(); ResultSet rs = ... Read More