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The conditional operator is used to make conditional expressions in Java. It is also called a Ternary operator because it has three operands such as boolean condition, first expression, and second expression.We can also write a conditional expression in lambda expression in the below program.Exampleinterface Algebra { int substraction(int a, int b); } public class ConditionalExpressionLambdaTest { public static void main(String args[]) { System.out.println("The value is: " + getAlgebra(false).substraction(20, 40)); System.out.println("The value is: " + getAlgebra(true).substraction(40, 10)); } static Algebra getAlgebra(boolean reverse) { Algebra alg = reverse ... Read More
A cast expression provides a mechanism to explicitly provide a lambda expression's type if none can be conveniently inferred from context. It is also useful to resolve ambiguity when a method declaration is overloaded with unrelated functional interface types.SyntaxObject o = () -> { System.out.println("TutorialsPoint"); }; // Illegal: Object o = (Runnable) () -> { System.out.println("TutorialsPoint"); }; // LegalExampleinterface Algebra1 { int operate(int a, int b); } interface Algebra2 { int operate(int a, int b); } public class LambdaCastingTest { public static void main(String[] args) { printResult((Algebra1)(a, b) -> a + b); // Cast Expression ... Read More
A return statement is not an expression in a lambda expression. We must enclose statements in braces ({}). However, we do not have to enclose a void method invocation in braces. The return type of a method in which lambda expression used in a return statement must be a functional interface.Example 1public class LambdaReturnTest1 { interface Addition { int add(int a, int b); } public static Addition getAddition() { return (a, b) -> a + b; // lambda expression return statement } public static void main(String args[]) { System.out.println("The ... Read More
An array is a fixed size element of the same type. The lambda expressions can also be used to initialize arrays in Java. But generic array initializes cannot be used.Example-1interface Algebra { int operate(int a, int b); } public class LambdaWithArray1 { public static void main(String[] args) { // Initialization of an array in Lambda Expression Algebra alg[] = new Algebra[] { (a, b) -> a+b, ... Read More
In Java 8, lambda expression accepts an anonymous function as a parameter. In the case of providing an anonymous method, we can also pass references of existing methods using "::" symbol. A method reference enables us to do the same thing but with existing methods.We can also implement an action listener for a JButton by using static method reference and referred using the class name.Syntax:: Method-name;Exampleimport java.awt.*; import java.awt.event.*; import javax.swing.*; public class MethodReferenceButtonListenerTest extends JFrame { private JButton button; public MethodReferenceButtonListenerTest() { setTitle("Method Reference Button Listener"); button = new JButton("Method Reference"); ... Read More
In this tutorial, we are going to learn how to use SQL with Python using SQLite database. has a built-in module to connect with SQLite database. We are going to use sqlite3 module to connect Python and SQLite.We have to follow the below steps to connect the SQLite database with Python. Have a look at the steps and write the program.Import the sqlite3 module.Create a connection using the sqlite3.connect(db_name) the method that takes a database name is an argument. It creates one file if doesn't exist with the given name else it opens the file with the given name.Get the ... Read More
In this tutorial, we are going to write a program that splits the given string into equal parts. Let's see an example.Inputstring = 'Tutorialspoint' each_part_length = 5OutputTutor ialsp ointXInputstring = 'Tutorialspoint' each_part_length = 6OutputTutori alspoi ntXXXX We are going to use the zip_longest method from the itertools module to achieve the result.The method zip_longest takes iterators as argument. We can also pass the fillvalue for partitioning the string. It will return list of tuples that contains characters of equal number.The zip_longest return a tuple on each iteration until the longest iterator in the given in exhausted. And the tuple contains ... Read More
In this tutorial, we are going to learn about the sorted() function in Python.The function sorted() is used to sort an iterable in ascending or descending order. We can even sort the list of dictionaries based on different keys and values. Let's get most out of the sorted() function.The sorted() function is not an in-place algorithm like sort method.Default sorted()The function sorted() will sort an iterable in ascending order by default. Let's see an example.Example Live Demo# initializing a list numbers = [4, 3, 5, 1, 2] # sorting the numbers sorted_numbers = sorted(numbers) # printing the sorted_numbers print(sorted_numbers)OutputIf you run ... Read More
In this tutorial, we are going to learn about the sort method of a list. Let's dive into the tutorial. The method sort is used to sort any list in ascending or descending order. There are many cases of sort method with or without optional parameters.The method sort is an in-place method. It directly changes in the original listLet's see one by one.Default sort()The method sort without any optional parameters will sort the list in ascending order. Let's an example.Example Live Demo# initializing a list numbers = [4, 3, 5, 1, 2] # sorting the numbers numbers.sort() # printing the numbers ... Read More
In this tutorial, we are going to write a program that uses set update method to union multiple arrays. And it will return a resultant one-dimension array with all unique values from the arrays.Let's see an example to understand it more clearly.Let's see an example to understand it more clearly.Inputarrays = [[1, 2, 3, 4, 5], [6, 7, 8, 1, 2, 3, 4, 5], [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]]Output[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]Follow the below steps to write the program.Initialize the array as shown in the example.3Create an empty.Iterate over ... Read More