// 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...
// Java program to demonstrate // OptionalDouble.stream() method import java.util.OptionalDouble; import java.util.stream.DoubleStream; public class GFG { public static void main(String[] args) { // create a OptionalDouble OptionalDouble opDouble = OptionalDouble.of(.3203); // get value ...
下面的程序说明了isPresent()方法:程序1: // Java program to demonstrate // OptionalLong.isPresent() method importjava.util.OptionalLong; publicclassGFG{ publicstaticvoidmain(String[]args) { // create a OptionalLong OptionalLongopLong =OptionalLong.of(45213246); // get value using isPresent() Sy...
// Java program to demonstrate // OptionalDouble.isPresent() method import java.util.OptionalDouble; public class GFG { public static void main(String[] args) { // create a OptionalDouble OptionalDouble opDouble = OptionalDouble.of(3148.1345); // get value using isPresent() System.out....
// Java program to demonstrate// Optional.get() methodimportjava.util.*;publicclassGFG{publicstaticvoidmain(String[] args){// create a OptionalOptional<Integer> op = Optional.empty();// print valueSystem.out.println("Optional: "+ op);try{//getthe valueSystem.out.println("Value of "+"...
Java Copy 参数:此方法不接受任何东西。 返回值:该方法返回一个空的OptionalDouble。 下面的程序说明了empty()方法。 程序1: // Java program to demonstrate// OptionalDouble.empty() methodimportjava.util.OptionalDouble;publicclassGFG{publicstaticvoidmain(String[]args){// create a OptionalDouble// using...
// Java program to demonstrate// Optional.filter() methodimportjava.util.*;publicclassGFG{publicstaticvoidmain(String[] args){// create a OptionalOptional<Integer> op = Optional.of(9456);// print valueSystem.out.println("Optional: "+ op);//filterthe valueSystem.out.println("Filtered value...
// Java program to demonstrate // OptionalInt.isPresent() method import java.util.OptionalInt; public class GFG { public static void main(String[] args) { // create a OptionalInt OptionalInt opInt = OptionalInt.of(12345); // get value using isPresent() System.out.println("OptionalInt ...
// 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.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 ...