Programming Articles - Page 2236 of 3366

An interface defined with only one abstract method is known as Functional Interface. It's not mandatory to mark the functional interface with @FunctionalInterface annotation, the compiler doesn't throw any error. But it’s good practice to use @FunctionalInterface annotation to avoid the addition of extra methods accidentally. If an interface annotated with @FunctionalInterface annotation and more than one abstract method then it throws a compile-time error.Syntax@FunctionalInterface interface interface_name {    // only one abstarct method declaration }Example@FunctionalInterface interface Shape {    void printArea(int x); } public class SquareTest {    public static void main (String args[]) {       Shape square ... Read More

To get the total number of elements in a specified dimension of an array, the code is as follows −Example Live Demousing System; public class Demo {    public static void Main() {       string[] products = new string[] { "Andy", "Mark", "Gary", "Andre"};       Console.WriteLine("One or more name begins with 'A'? = {0}",       Array.Exists(products, ele => ele.StartsWith("A")));       Console.WriteLine("Is the array having fixed size? = " + products.IsFixedSize);       Console.WriteLine("Is the array read only? = " + products.IsReadOnly);       Console.WriteLine("Is the array synchronized? = " + products.IsSynchronized); ... Read More

To set the capacity to the actual number of elements in a SortedList object, the code is as follows −Example Live Demousing System; using System.Collections; public class Demo {    public static void Main(String[] args) {       SortedList sortedList = new SortedList();       sortedList.Add("A", "1");       sortedList.Add("B", "2");       sortedList.Add("C", "3");       sortedList.Add("D", "4");       sortedList.Add("E", "5");       sortedList.Add("F", "6");       sortedList.Add("G", "7");       sortedList.Add("H", "8");       sortedList.Add("I", "9");       sortedList.Add("J", "10");       Console.WriteLine("SortedList elements...");     ... Read More

To set the capacity to the actual number of elements in the ArrayList, the code is as follows −Example Live Demousing System; using System.Collections; public class Demo {    public static void Main(String[] args) {       ArrayList list1 = new ArrayList();       list1.Add("A");       list1.Add("B");       list1.Add("C");       list1.Add("D");       list1.Add("E");       list1.Add("F");       list1.Add("G");       list1.Add("H");       list1.Add("I");       Console.WriteLine("Elements in ArrayList1...");       foreach (string res in list1) {          Console.WriteLine(res);     ... Read More

To search for an element matching the conditions and return the zero-based index of the last occurrence within the entire List, the code is as follows −Example Live Demousing System; using System.Collections.Generic; public class Demo {    private static bool demo(int i) {       return ((i % 10) == 0);    }    public static void Main(String[] args) {       List list = new List();       list.Add(200);       list.Add(215);       list.Add(310);       list.Add(500);       list.Add(600);       Console.WriteLine("List elements...");       foreach (int i in ... Read More

To search the index of specified object in Collection, the code is as follows −Example Live Demousing System; using System.Collections.Specialized; public class Demo {    public static void Main() {       StringCollection strCol = new StringCollection();       strCol.Add("Accessories");       strCol.Add("Books");       strCol.Add("Electronics");       strCol.Add("Books");       Console.WriteLine("StringCollection elements...");       foreach (string res in strCol) {          Console.WriteLine(res);       }       strCol.Insert(2, "Headphone");       Console.WriteLine("StringCollection elements...UPDATED");       foreach (string res in strCol) {          Console.WriteLine(res); ... Read More

To get the number of elements contained in the BitArray, the code is as follows −Example Live Demousing System; using System.Collections; public class Demo {    public static void Main() {       BitArray arr1 = new BitArray(5);       BitArray arr2 = new BitArray(5);       arr1[0] = false;       arr1[1] = false;       arr2[0] = false;       arr2[1] = true;       Console.WriteLine("BitArray1 elements...");       foreach (bool res in arr1) {          Console.WriteLine(res);       }       Console.WriteLine("BitArray2 elements...");     ... Read More

To check whether a thread is alive or not, the code is as follows −Example Live Demousing System; using System.Threading; public class Demo {    public static void Main() {       Thread thread = new Thread(new ThreadStart(demo1));       thread = Thread.CurrentThread;       Console.WriteLine("Is the thread alive? = "+thread.IsAlive);       ThreadPool.QueueUserWorkItem(new WaitCallback(demo2));       Console.WriteLine("Current state of Thread = "+thread.ThreadState);       Console.WriteLine("ManagedThreadId = "+thread.ManagedThreadId);       thread.IsBackground = true;       Console.WriteLine("Is the Thread a background thread? = "+thread.IsBackground);    }    public static void demo1() {     ... Read More

To search in a SortedList object, the code is as follows −Example Live Demousing System; using System.Collections; public class Demo {    public static void Main() {       SortedList list = new SortedList();       list.Add("1", "One");       list.Add("2", "Two");       list.Add("3", "Three");       list.Add("4", "Four");       list.Add("5", "Five");       list.Add("6", "Six");       list.Add("7", "Seven");       list.Add("8", "Eight");       Console.WriteLine("Key and Value of SortedList....");       foreach(DictionaryEntry k in list )       Console.WriteLine("Key: {0}, Value: {1}", k.Key , k.Value ... Read More

The lambda expression composed of two parts, one is an argument and another one is code or expression. These two parts have separated by an arrow operator "->". We can use different IDE's like Netbeans, IntelliJ,  and Eclipse to debug the lambda expressions in Java. It is always possible to create multi-line lambda expressions and use print statements to display the values of a variable. The debugger can also provide additional information about the state of a java program. It allows some variables to be modified while the debugger is executing.Syntax(parameters) -> expression   or (parameters) -> { statements; }Exampleimport java.util.*; public class LambdaDebugTest { ... Read More