// Java program to demonstrate // Optional.or() method import java.util.*; import java.util.function.*; public class GFG { public static void main(String[] args) { // create a Optional Optional<Integer> op = Optional.of(9455); // print supplier System.out.println("Optional: " + ...
// Java program to demonstrate // Optional.or() method import java.util.*; import java.util.function.*; public class GFG { public static void main(String[] args) { // create a Optional Optional<Integer> op = Optional.empty(); // print supplier System.out.println("Optional: " + op...
Copy 程序2 // Java program to demonstrate// OptionalDouble.equals(Object obj) methodimportjava.util.OptionalDouble;publicclassGFG{publicstaticvoidmain(String[]args){// Create first OptionalDouble objectOptionalDoubleopDouble1=OptionalDouble.of(3179464.92);System.out.println("OptionalDouble 1: "+opDoub...
示例1: // Java program to demonstrate// Optional.get() methodimportjava.util.*;publicclassGFG{publicstaticvoidmain(String[] args){// create a OptionalOptional<Integer> op = Optional.of(9455);// print valueSystem.out.println("Optional: "+ op);//getthe valueSystem.out.println("Value of ...
// Java program to demonstrate // OptionalLong.isPresent() method importjava.util.OptionalLong; publicclassGFG{ publicstaticvoidmain(String[]args) { // create a OptionalLong OptionalLongopLong=OptionalLong.empty(); // try to get that value is present or not ...
// Java program to demonstrate// Optional.isPresent() methodimportjava.util.*;publicclassGFG{publicstaticvoidmain(String[] args){// create a OptionalOptional<Integer> op = Optional.of(9455);// print valueSystem.out.println("Optional: "+ op);// check for the valueSystem.out.println("Is ...
// Java program to demonstrate // OptionalInt.stream() method import java.util.OptionalInt; import java.util.stream.IntStream; public class GFG { public static void main(String[] args) { // create a OptionalInt OptionalInt opInt = OptionalInt.of(452146); // get value as stream Int...
// Java program to demonstrate // OptionalDouble.getAsDouble() method import java.util.OptionalDouble; public class GFG { public static void main(String[] args) { // Create an OptionalDouble instance OptionalDouble opDouble = OptionalDouble.of(44356.455); System.out.println("OptionalDouble: "...
// Java program to demonstrate// Optional.empty() methodimportjava.util.*;publicclassGFG{publicstaticvoidmain(String[] args){// create a OptionalOptional<Integer> op = Optional.empty();// print valueSystem.out.println("Optional: "+ op); ...
Java Copy 输出: 程序2: // Java program to demonstrate// OptionalDouble.ifPresent(DoubleConsumer) methodimportjava.util.OptionalDouble;publicclassGFG{publicstaticvoidmain(String[]args){// create a OptionalDoubleOptionalDoubleopdouble=OptionalDouble.empty();// apply ifPresent(DoubleConsumer)...