Raja has Published 806 Answers

How to implement IntBinaryOperator using lambda expression in Java?

raja

raja

Updated on 14-Jul-2020 09:22:47

IntBinaryOperator is a functional interface in Java 8 from java.util.function package. This interface expects two parameters of type int as input and produces an int type result. IntBinaryOperator can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: applyAsInt().Syntax@FunctionalInterface public interface IntBinaryOperator {  int applyAsInt(int left, int right) ... Read More

How to implement Function interface with lambda expression in Java?

raja

raja

Updated on 14-Jul-2020 09:16:29

Function interface is a functional interface from java.util.function package. This interface expects one argument as input and produces a result. Function interface can be used as an assignment target for a lambda expression or method reference. It contains one abstract method: apply(), two default methods: andThen() and compose() and one static method: identity().Syntax@FunctionalInterface ... Read More

How to implement DoubleSupplier using lambda and method reference in Java?

raja

raja

Updated on 14-Jul-2020 09:12:01

DoubleSupplier interface is a built-in functional interface defined in java.util.function package. This functional interface doesn’t expect any input but produces a double-valued output. DoubleSupplier interface can be used as an assignment target for lambda expression and method reference. This interface contains only one abstract method: getAsDouble().Syntax@FunctionalInterface public interface DoubleSupplier {    double getAsDouble(); }Example of Lambda Expressionimport ... Read More

How to create our own/custom functional interface in Java?

raja

raja

Updated on 14-Jul-2020 08:50:12

The functional interface is a simple interface with only one abstract method. A lambda expression can be used through a functional interface in Java 8. We can declare our own/custom functional interface by defining the Single Abstract Method (SAM) in an interface.Syntaxinterface CustomInterface {    // abtstact method }Example@FunctionalInterface interface CustomFunctionalInterface {    void display(); } public ... Read More

How to implement ObjLongConsumer interface using lambda expression in Java?

raja

raja

Updated on 14-Jul-2020 08:42:51

ObjLongConsumer is a functional interface from java.util.function package. This interface accepts an object-valued and long-valued argument as input but doesn't produce any output. ObjLongConsumer can be used as an assignment target for lambda expression and method reference and contains only one abstract method: accept().Syntax@FunctionalInterface public interface ObjLongConsumer {  void accept(T t, long value) }Exampleimport java.util.function.ObjLongConsumer; ... Read More

What are the rules for a functional interface in Java?

raja

raja

Updated on 14-Jul-2020 08:12:26

A functional interface is a special kind of interface with exactly one abstract method in which lambda expression parameters and return types are matched. It provides target types for lambda expressions and method references.Rules for a functional interfaceA functional interface must have exactly one abstract method.A functional interface has any number of ... Read More

How to implement LongFunction using lambda and method reference in Java?

raja

raja

Updated on 14-Jul-2020 08:10:54

LongFunction is an in-built functional interface defined in java.util.function package. This functional interface expects a long-valued parameter as input and produces a result. LongFunction interface can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: apply().Syntax@FunctionalInterface public interface LongFunction {  R apply(long value) }Exampleimport java.util.function.LongFunction; ... Read More

How to implement LongBinaryOperator using lambda and method reference in Java?

raja

raja

Updated on 14-Jul-2020 07:43:00

LongBinaryOperator is a part of the functional interface from java.util.function package. This functional interface expects two parameters of type long as the input and produces a long type result. LongBinaryOperator interface can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method, applyAsLong().Syntax@FunctionalInterface public interface LongBinaryOperator { ... Read More

How to use this and super keywords with lambda expression in Java?

raja

raja

Updated on 14-Jul-2020 07:32:30

The "this" and "super" references within a lambda expression are the same as in the enclosing context. Since the lambda expression doesn't define a new scope, "this" keyword within a lambda expression signifies "this" parameter of a method where the lambda expression is residing.In the below example, this.toString() calls the toString() ... Read More

How to implement IntConsumer using lambda and method reference in Java?

raja

raja

Updated on 14-Jul-2020 07:31:43

IntConsumer interface is a functional interface from java.util.function package in Java 8. This interface accepts a single int-valued argument as input but doesn't produce any output. Since it is a functional interface, it can be used as an assignment target for a lambda expression or method reference. It contains one abstract method: accept() and ... Read More

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