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Articles by Daniol Thomas
Page 6 of 13
HTML5 data-* attribute type casting strings and numbers
HTML5 data-* attributes are always stored as strings, regardless of whether they contain numeric values. To properly work with these values, you need to understand type casting and conversion methods. Understanding data-* Attribute Type Casting When you retrieve values from data attributes using the dataset property, they are always returned as strings. For numeric operations, you'll need to convert them explicitly. Example For data-attribute type casting of Numbers and Strings, use the following approach − Data Attribute Type Casting 6.0 ...
Read MoreHTML5 Canvas to PNG File
To convert an HTML5 Canvas to a PNG file, you use the canvas.toDataURL() method. This method generates a base64-encoded data URL representing the canvas content as a PNG image. You can then use this data URL to display the image or trigger a file download. How canvas.toDataURL() Works The toDataURL() method returns a string containing the canvas image in the specified format. For PNG, the returned string looks like this − data:image/png;base64, iVBORw0KGgoAAAANSUhEUg.... You can assign this data URL to an tag's src attribute to display the canvas content as a regular image − ...
Read MoreA closer look at Java "Hello World" program
Let us look at a simple code that will print the words Hello World.Examplepublic class MyFirstJavaProgram { /* This is my first java program. * This will print 'Hello World' as the output */ public static void main(String []args) { System.out.println("Hello World"); // prints Hello World } }Let's look at how to save the file, compile, and run the program. Please follow the subsequent steps −Open notepad and add the code as above.Save the file as: MyFirstJavaProgram.java.Open a command prompt window and go to the directory where you saved the class. Assume it's ...
Read MoreThe set() method of AbstractList class in Java
The set() method of the AbstractList class is used to replace the element at the specified position in this list with the specified element. It returns the element that gets replaced.The syntax is as follows:public E set(int index, E ele)Here, the parameter index is the index of the element to replace, whereas ele is the element to be stored at the specified position.To work with the AbstractList class, import the following package:import java.util.AbstractList;The following is an example to implement set() method of the AbstractlList class in Java:Exampleimport java.util.LinkedList; import java.util.AbstractList; public class Demo { public static void main(String[] args) ...
Read MoreThe contains() method of Java AbstractCollection class
The contains() method of the AbstractCollection class checks whether an element is in the AbstractCollection or not. It returns a Boolean i.e. TRUE if the element is in the collection, else FALSE is returned.The syntax is as follows:public boolean contains(Object ele)Here, ele is the element to be checked for existence.To work with AbstractCollection class in Java, import the following package:import java.util.AbstractCollection;The following is an example to implement AbstractCollection contains() method in Java:Exampleimport java.util.ArrayList; import java.util.AbstractCollection; public class Demo { public static void main(String[] args) { AbstractCollection absCollection = new ArrayList(); absCollection.add("Football"); ...
Read MoreThe remove() method of AbstractList class in Java
Remove an element at a specified position from the list using the remove() method. The position is to be set as index parameter in the method itself. It returns the element which is removed.The syntax is as follows:public E remove(int index)Here, index is the index from where you want to delete the element.To work with the AbstractList class, import the following package:import java.util.AbstractList;The following is an example to implement remove() method of the AbstractlList class in Java:Exampleimport java.util.ArrayList; import java.util.AbstractList; public class Demo { public static void main(String[] args) { AbstractList myList = new ArrayList(); ...
Read MoreThe get() method of CopyOnWriteArrayList in Java
The get() method of CopyOnWriteArrayList class returns the element at the specified position in this list.The syntax is as follows:E get(int index)Here, the parameter index is the position from where you want the element.To work with CopyOnWriteArrayList class, you need to import the following package:import java.util.concurrent.CopyOnWriteArrayList;The following is an example to implement CopyOnWriteArrayList class get() method in Java:Exampleimport java.util.concurrent.CopyOnWriteArrayList; public class Demo { public static void main(String[] args) { CopyOnWriteArrayList arrList = new CopyOnWriteArrayList(); arrList.add(100); arrList.add(250); arrList.add(400); arrList.add(500); arrList.add(650); ...
Read MorePeriod getYears() method in Java
The number of years for a particular Period can be obtained using the getYears() method in the Period class in Java. This method requires no parameters and it returns the number of years in the Period.A program that demonstrates this is given as followsExampleimport java.time.Period; public class Demo { public static void main(String[] args) { String period = "P5Y7M15D"; Period p = Period.parse(period); System.out.println("The Period is: " + p); System.out.println("The number of years are: " + p.getYears()); } }OutputThe Period is: P5Y7M15D The number of years ...
Read MoreThe size() method of Java AbstractCollection class
The size() method of the AbstractCollection class returns the numbers of elements in the collection. The method returns Integer.MAX_VALUE if the total number of elemnts in the collection exceeds the Interger.MAX_VALUE.The syntax is as follows:public abstract int size()To work with AbstractCollection class in Java, import the following package:import java.util.AbstractCollection;The following is an example to implement AbstractCollection size() method in Java:Exampleimport java.util.ArrayList; import java.util.AbstractCollection; public class Demo { public static void main(String[] args) { AbstractCollection absCollection = new ArrayList(); absCollection.add("Laptop"); absCollection.add("Tablet"); absCollection.add("Mobile"); absCollection.add("E-Book Reader"); ...
Read MoreThe addAll() method of Java AbstractSequentialList class
The addAll() method of the AbstractSequentialList class inserts all the elements in the specified collection into this list at the specified position. Set the specified position as the parameter.The syntax is as follows:boolean addAll(int index, Collection
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