Raja has Published 469 Articles

What is a target type of lambda expression in Java?

raja

raja

Updated on 11-Jul-2020 08:30:22

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A functional Interface for which a lambda expression has invoked is called target type of lambda expression. It means that if a lambda expression has invoked for some "X" interface then "X" is the target type of that lambda expression. Hence, we conclude that lambda expressions can be used only in those ... Read More

How to write a conditional expression in lambda expression in Java?

raja

raja

Updated on 11-Jul-2020 07:48:12

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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 ... Read More

What is a casting expression in Java?

raja

raja

Updated on 11-Jul-2020 07:40:37

847 Views

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 = ... Read More

How to use a return statement in lambda expression in Java?

raja

raja

Updated on 11-Jul-2020 07:31:48

12K+ Views

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 ... Read More

How to initialize an array using lambda expression in Java?

raja

raja

Updated on 11-Jul-2020 07:31:06

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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) { ... Read More

How to implement an action listener using method reference in Java?

raja

raja

Updated on 11-Jul-2020 07:11:00

655 Views

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 ... Read More

Differences between Lambda Expression and Method Reference in Java?

raja

raja

Updated on 11-Jul-2020 06:54:44

8K+ Views

Lambda expression is an anonymous method (method without a name) that has used to provide the inline implementation of a method defined by the functional interface while a method reference is similar to a lambda expression that refers a method without executing it. The arrow (->) operator can be used to connect the argument and ... Read More

How to implement an instance method of an arbitrary object using method reference in Java?

raja

raja

Updated on 11-Jul-2020 06:20:53

1K+ Views

A method reference is a new feature in Java 8, which is related to Lambda Expression. It can allow us to reference constructors or methods without executing them. The method references and lambda expressions are similar in that they both require a target type that consists of a compatible functional interface.SyntaxClass :: instanceMethodNameExampleimport java.util.*; ... Read More

How can we iterate the elements of List and Map using lambda expression in Java?

raja

raja

Updated on 11-Jul-2020 06:15:14

11K+ Views

The lambda expressions are inline code that implements a functional interface without creating an anonymous class. In Java 8, forEach statement can be used along with lambda expression that reduces the looping through a Map to a single statement and also iterates over the elements of a list. The forEach() method defined ... Read More

Convert an object to another type using map() method with Lambda in Java?

raja

raja

Updated on 11-Jul-2020 06:13:04

9K+ Views

In Java 8, we have the ability to convert an object to another type using a map() method of Stream object with a lambda expression. The map() method is an intermediate operation in a stream object, so we need a terminal method to complete the stream.SyntaxStream map(Function

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