Raja has Published 496 Answers

Are lambda expressions objects in Java?

raja
raja
Published on 06-Dec-2019 12:45:29
Yes, any lambda expression is an object in Java. It is an instance of a functional interface. We have assigned a lambda expression to any variable and pass it like any other object.Syntax(parameters) -> expression              or (parameters) -> { statements; }In the below example, ... Read More

How to write the comparator as a lambda expression in Java?

raja
raja
Published on 06-Dec-2019 10:26:25
A lambda expression is an anonymous method and doesn't execute on its own in java. Instead, it is used to implement a method defined by the functional interface. A lambda expression used with any functional interface and Comparator is a functional interface. The Comparator interface has used when sorting a collection of objects ... Read More

What are the scoping rules for lambda expressions in Java?

raja
raja
Published on 06-Dec-2019 06:41:28
There are different scoping rules for lambda expression in Java. In lambda expressions, this and super keywords are lexically scoped means that this keyword refers to the object of the enclosing type and the super keyword refers to the enclosing superclass. In the case of an anonymous class, they are ... Read More

How many parameters can a lambda expression have in Java?

raja
raja
Published on 05-Dec-2019 10:38:58
The lambda expressions are easy and contain three parts like parameters (method arguments), arrow operator (->) and expressions (method body). The lambda expressions can be categorized into three types: no parameter lambda expressions, single parameter lambda expressions and multiple parameters lambda expressions.Lambda Expression with no parameterWe need to create no parameter lambda expression then start ... Read More

What is the syntax for lambda expressions in Java?

raja
raja
Published on 05-Dec-2019 07:15:01
A lambda expression is an anonymous method (method without a name) that can be used to provide the implementation of a method defined by the functional interface.Syntax([comma seperated argument-list]) -> {body}Rules for Lambda Expression SyntaxWe can omit the datatypes since the compiler able to guess the type of parameters. When there is a single argument ... Read More

What are block lambda expressions in Java?

raja
raja
Published on 04-Dec-2019 10:32:44
A lambda block states that lambda expression with multiple statements. It expands the type of operations to perform with a lambda expression. The multiple statements containing bodies are called expression bodies. A lambda expression with expression bodies is called expression lambdas. Whenever we are using expression lambdas, explicitly use a return ... Read More

How can we use lambda expressions with functional interfaces in Java?

raja
raja
Published on 04-Dec-2019 07:28:06
The lambda expressions are anonymous functions and don't have any return type, access modifier and not belonging to any class. It can be used to simplify the implementation of the abstract method in a functional interface. Whenever there is a functional interface, we can use lambda expressions instead of anonymous inner classes.Syntax([comma ... Read More

What is the data type of a lambda expression in Java?

raja
raja
Published on 02-Dec-2019 09:14:51
The lambda expressions have a very simple, precise syntax and provide flexibility to specify the datatypes for the function parameters. Its return type is a parameter -> expression body to understand the syntax, we can divide it into three parts.Parameters : These are function method parameters and match with the signature of ... Read More

What are lambda expressions in Java?

raja
raja
Published on 02-Dec-2019 05:49:45
The implementation of functional interfaces has simplified using lambda expressions in Java 8. The lambda expressions are functions as arguments in Java. The lambda expression introduces a new syntax element and operator in Java and refers to the lambda operator or the arrow operator (->).Exampleinterface Print {    void print(String message); ... Read More

What to use @SerializedName annotation using Gson in Java?

raja
raja
Published on 20-Nov-2019 13:08:52
The @SerializedName annotation can be used to serialize a field with a different name instead of an actual field name. We can provide the expected serialized name as an annotation attribute, Gson can make sure to read or write a field with the provided name.Syntax@Retention(value=RUNTIME) @Target(value={FIELD, METHOD}) public @interface SerializedNameExampleimport ... Read More
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