The toString() method of java.util.Optional class in Java is used to get the string representation of this Optional instance.
Syntax:
public String toString()
Parameters: This method accepts nothing.
Return value: This method returns the string representation of this Optional instance.
Below programs illustrate toString() method:
Program 1:
// Java program to demonstrate// Optional.toString() method import java.util.*; public class GFG { public static void main(String[] args) { // create a Optional Optional<Integer> op = Optional.of(452146); // get value using toString String value = op.toString(); // print value System.out.println("String Representation: " + value); }} |
Output:
String Representation: Optional[452146]
Program 2:
// Java program to demonstrate// Optional.toString() method import java.util.Optional; public class GFG { public static void main(String[] args) { // create a Optional Optional<Integer> op = Optional.empty(); // get value using toString String value = op.toString(); // print value System.out.println("String Representation: " + value); }} |
Output:
String Representation: Optional.empty
References: https://docs.oracle.com/javase/9/docs/api/java/util/Optional.html#toString–
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