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Articles on Trending Technologies
Technical articles with clear explanations and examples
Create a TreeSet in Java
Create a TreeSet and add elements −TreeSet tSet = new TreeSet(); tSet.add("TV"); tSet.add("Radio"); tSet.add("Internet");Iterate through the elements −Iterator i = tSet.iterator(); while(i.hasNext()){ System.out.println(i.next()); }The following is an example to create a TreeSet −Exampleimport java.util.*; public class Demo { public static void main(String args[]){ TreeSet tSet = new TreeSet(); tSet.add("TV"); tSet.add("Radio"); tSet.add("Internet"); Iterator i = tSet.iterator(); while(i.hasNext()){ System.out.println(i.next()); } } }OutputInternet Radio TV
Read MoreLoop through the Vector elements using an Iterator in Java
An Iterator can be used to loop through the Vector elements. The method hasNext( ) returns true if there are more elements in the Vector and false otherwise. The method next( ) returns the next element in the Vector and throws the exception NoSuchElementException if there is no next element.A program that demonstrates this is given as follows −Exampleimport java.util.Iterator; import java.util.Vector; public class Demo { public static void main(String args[]) { Vector vec = new Vector(); vec.add(4); vec.add(1); vec.add(3); vec.add(9); ...
Read MoreMake a class final in Java
A class can be made final by using the final keyword. The final class cannot be inherited and so the final keyword is commonly used with a class to prevent inheritance.A program that demonstrates a final class in Java is given as follows:Examplefinal class A { private int a = 15; public void printA() { System.out.println("Value of a = " + a); } } public class Demo { public static void main(String args[]) { A obj = new A(); obj.printA(); } }OutputValue of a = 15Now ...
Read MoreHow many times finalize method will be invoked? who invokes finalize() method in Java?
The finalize() method belongs to the Object class. Right before closing an object, the garbage collector makes sure that there are no more references to it and, calls the finalize() method on it.Therefore, once you override the finalize() method in it, you can do all the cleanup activity like closing the resources like database connection, network connection, etc.protected void finalize throws Throwable{}It is invoked only once during the execution of a program.Following are some notable points about the finalize method.Since this method belongs the Object class, which is the super class of all the classes in java, you can override ...
Read MoreHTML DOM Input Date value Property
The HTML DOM Input Date value property returns a string, which is the value of the value attribute of input date. User can also set it to a new string.SyntaxFollowing is the syntax −Returning string valueinputDateObject.valueSetting value attribute to a string valueinputDateObject.value = ‘String’ExampleLet us see an example of Input Date value property − Input Date Value Calendar: Change Value var divDisplay = document.getElementById("divDisplay"); var inputDate = document.getElementById("dateSelect"); divDisplay.textContent = 'Current value: '+ inputDate.value; function changeValue(){ var currDate = inputDate.value; inputDate.value ...
Read MoreWhy Abstract Class is used in Java?
A class is an abstract class if it contains at least one abstract method. It can contain other non-abstract methods as well. A class can be declared as abstract by using the abstract keyword. Also, an abstract class cannot be instantiated.A program that demonstrates an abstract class in Java is given as follows:Exampleabstract class Animal { abstract void sound(); } class Cat extends Animal { void sound() { System.out.println("Cat Meows"); } } class Dog extends Animal { void sound() { System.out.println("Dog Barks"); } } class Cow extends Animal { ...
Read MoreLongStream summaryStatistics() method in Java
The summaryStatistics() method in the LongStream class in Java returns a LongSummaryStatistics describing various summary data about the elements of this stream.The syntax is as follows −LongSummaryStatistics summaryStatistics()Here, LongSummaryStatistics is a state object for collecting statistics such as count, min, max, etc.To use the LongStream class in Java, import the following packageimport java.util.stream.LongStream;Create LongStream and add some elements −LongStream longStream = LongStream.of(30000L, 15000L, 20000l, 25000l, 30000l);Now, get the statistics −LongSummaryStatistics info = longStream.summaryStatistics(); The following is an example to implement LongStream summaryStatistics() method in Java −Exampleimport java.util.stream.LongStream; import java.util.LongSummaryStatistics; public class Demo { public static void ...
Read MoreCan we pass objects as an argument in Java?
Yes, you can pass objects as arguments in Java. Consider the following example: Here we have a class with name EmployeeExampleIn the following Java example, we a have a class with two instance variables name and age and a parameterized constructor initializing these variables.We have a method coypObject() which accepts an object of the current class and initializes the instance variables with the variables of this object and returns it.In the main method we are instantiating the Student class and making a copy by passing it as an argument to the coypObject() method.import java.util.Scanner; public class Student { private ...
Read MoreHTML DOM Input Datetime autofocus Property
The HTML DOM Input Datetime autofocus property sets/returns whether Input Datetime is focused upon initial page load.SyntaxFollowing is the syntax −Returning boolean value - true/falseinputDatetimeObject.autofocusSetting autofocus to booleanValueinputDatetimeObject.autofocus = booleanValueBoolean ValuesHere, “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 Datetime autofocus property − Input Datetime Autofocus Date & Time: Remove Auto Focus var divDisplay = document.getElementById("divDisplay"); var inputDatetime = document.getElementById("Datetime"); divDisplay.textContent = 'Autofocus: '+inputDatetime.autofocus function removeAutoFocus() { ...
Read MoreHow to access a function property as a method in JavaScript?
Accessing a function as a method A javascript object is made up of properties. To access a property as a method, just define a function to a property and include other properties in that function.In the following example an object called "employee" is created with properties "fullName", "lastName" , "firstName" and "id". A function is defined under property "fullName" and properties such as "firstName" and "lastName" were included in it. So when the property "fullName" is called, the full name of the employee is going to display as shown in the output.Example-1 var employee = { ...
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