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) }Exampleimport java.util.function.*; public class IntBinaryOperatorTest {    public static void main(String[] args) {       IntBinaryOperator test1 = (a, b) -> a + b; // lambda expression       System.out.println("Addition of two parameters: " + test1.applyAsInt(10, 20));       IntFunction test2 = new IntFunction() {     ... Read More

Hibernate support two type of cache one is first level cache and other is second level cache. First level cache is a session level cache and it is always associated with session level object. This type of cache is used for minimizing Db interaction by caching the state of the object. That is instead of updating after every modification done in the transaction, it updates the transaction only at the end of the transaction.Second level cache is session factory level cache and it is available across all sessions.While running the transactions, in between it loads the objects at the Session Factory level, ... Read More

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 public interface Function {  R apply(T t); }Exampleimport java.util.function.Function; public class FunctionTest {    public static void main(String[] args) {       Function f1 = i -> i*4;   // lambda       System.out.println(f1.apply(3));       Function f2 = i -> i+4; // lambda   ... Read More

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 java.util.concurrent.ThreadLocalRandom; import java.util.function.DoubleSupplier; public class DoubleSupplierLambdaTest {    public static void main(String args[]) {       DoubleSupplier getRandomDouble = () -> {    // lambda expression          double doubleVal = ThreadLocalRandom.current().nextDouble(0000, 9999);          return Math.round(doubleVal);       };       ... Read More

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 class FunctionInterfaceLambdaTest {    public static void main(String args[]) {       // Using Anonymous inner class       CustomFunctionalInterface test1 = new CustomFunctionalInterface() {          public void display() {             System.out.println("Display using Anonymous inner class");         ... Read More

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; public class ObjLongConsumerTest {    public static void main(String[] args) {       ObjLongConsumer olc = (employee, number) -> {     // lambda expression          if(employee != null) {             System.out.println("Employee Name: " + employee.getEmpName());         ... Read More

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; public class LongFunctionTest {    public static void main(String[] args) {       LongFunction function1 = (long i) -> { // lambda expression          return i + i;       };       System.out.println("Using Lambda Expression: " + function1.apply(10));       LongFunction ... Read More

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 default methods because they are not abstract and implementation already provided by the same.A functional interface declares an abstract method overriding one of the public methods from java.lang.Object still considered as functional interface. The reason is any implementation class to this interface can have implementation for this abstract method either from ... Read More

Spring Boot Actuator is one of the greatest and most useful feature in Spring Boot framework. Actuator module in spring boot helps application developers to implement the production grade features like metrics, health check, security, etc. with minimal effort.This article will guide you through how to enable the spring boot actuator, configure endpoints and how to modify the default settings in the application.properties file. Note that spring boot actuator can work only for the spring boot application, this can not be integrated to the non-spring boot applications.List of Endpoints SupportedHere is the list of actuator endpoints that is supported at ... Read More

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 {  long applyAsLong(long left, long right) }Example of Lambda Expressionimport java.util.function.LongBinaryOperator; public class LongBinaryOperatorTest1 {    public static void main(String[] args) {       LongBinaryOperator multiply = (a, b) -> { // lambda expression          return a*b;       };       long a = ... Read More