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Programming Articles
Page 2302 of 2547
How to implement ObjLongConsumer interface using lambda expression in Java?
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 MoreHow to implement LongFunction using lambda and method reference in Java?
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; ...
Read MoreHow to implement LongBinaryOperator using lambda and method reference in Java?
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 MoreHow to implement IntConsumer using lambda and method reference in Java?
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 one default method: andThen().Syntax@FunctionalInterface public interface IntConsumer { void accept(int value); }Example of Lambda Expressionimport java.util.function.IntConsumer; public class IntConsumerTest1 { public static void main(String[] args) { IntConsumer displayNextInt = i -> System.out.println("Next Int ...
Read MorePrint all permutations with repetition of characters in C++
In this problem, we are given a string of n characters and we have to print all permutations of characters of the string. Repeating of characters of the string is allowed. The printing of permutation should be done in alphabetical order (lexicographically sorted order).Let’s take an example to understand the topic better :Input − XYOutput − XX, XY, YX, YYTo solve this problem, we need to use fix and recur logic. Here, we will fix one element at first index of the array and then recursively call for the next elements in the sequence.Let’s see an implementation example which will ...
Read MorePreconditions - Java
Precondition to check if the list passed as parameter is empty or not. Let us see an example −Examplepublic void my_fun(List myList){ if (myList == null){ throw new IllegalArgumentException("List is null"); } if (myList.isEmpty()){ throw new IllegalArgumentException("List is empty"); } my_fun(myList); }A void function named ‘my_fun’ is defined that takes a list of objects as its parameters. If the list is null, it prints the relevant message. If the list has no elements in it, a specific message is displayed. The function is called by passing the list as ...
Read MoreJava program to List all files in a directory and nested sub-directory - Recursive approach
To list all files in a directory and nested sub-directory, the Java program is as follows −Exampleimport java.io.File; public class Demo{ static void print_recursively(File[] my_arr, int my_index, int sub_level){ if(my_index == my_arr.length) return; for (int i = 0; i < sub_level; i++) System.out.print("\t"); if(my_arr[my_index].isFile()) System.out.println(my_arr[my_index].getName()); else if(my_arr[my_index].isDirectory()){ System.out.println("[" + my_arr[my_index].getName() + "]"); print_recursively(my_arr[my_index].listFiles(), 0, sub_level + 1); } ...
Read MoreHow to implement DoubleConsumer using lambda expression in Java?
DoubleConsumer is a functional interface from java.util.function package. This functional interface accepts a single double-valued argument as input and produces no output. This interface can be used as an assignment target for a lambda expression or method reference. DoubleConsumer contains one abstract method: accept() and one default method: andThen().Syntax@FunctionalInterface public interface DoubleConsumer { void accept(double value); }Example-1import java.util.function.DoubleConsumer; public class DoubleConsumerLambdaTest1 { public static void main(String args[]) { DoubleConsumer increment = doubleVal -> { // lambda expression ...
Read MoreHow to implement LongConsumer using lambda in Java?
LongConsumer is a in-built functional interface from java.util.function package. This interface can accept a single long-valued argument as input and doesn't produce any output. It can also be used as the assignment target for a lambda expression or method reference and contains one abstract method: accept() and one default method: andThen().Syntax@FunctionalInterface public interface LongConsumerExample-1import java.util.function.LongConsumer; public class LongConsumerLambdaTest { public static void main(String[] args) { LongConsumer displayNextVal = l-> { // lambda expression System.out.println("Display the next value ...
Read MoreHow to implement IntUnaryOperator using lambda in Java?
IntUnaryOperator represents a functional interface that takes an int value and returns another int value. It is defined in java.util.function package and used as an assignment target for a lambda expression or method reference. It contains one abstract method: applyAsInt(), two default methods: compose(), andThen() and one static method: identity().Syntax@FunctionalInterface public interface IntUnaryOperatorExampleimport java.util.function.IntUnaryOperator; public class IntUnaryOperatorLambdaTest1 { public static void main(String[] args) { IntUnaryOperator getSquare = intValue -> { // lambda expression int result = intValue * ...
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