In this tutorial, we will demonstrate how to get a value from the Optional class object using the get() method.
Get Value from Optional Object in Java - get() Method
The get() method returns a value if it is present in this Optional otherwise throws NoSuchElementException.
In the below example, the get() method returns a value because the value is present in the Optional class object:
package com.java.lambda.optional;
import java.util.Optional;
public class OptionalDemo {
public static void main(String[] args) {
String email = "ramesh@gmail.com";
Optional<String> stringOptional = Optional.ofNullable(email);
String value = stringOptional.get();
System.out.println(value);
}
}
Output:
ramesh@gmail.com
In the below example, the get() method throws the NoSuchElementException because the value is not present in the Optional class object:
package com.java.lambda.optional;
import java.util.Optional;
public class OptionalDemo {
public static void main(String[] args) {
String email = null;
Optional<String> stringOptional = Optional.ofNullable(email);
String value = stringOptional.get();
System.out.println(value);
}
}
Output:
Exception in thread "main" java.util.NoSuchElementException: No value present
at java.base/java.util.Optional.get(Optional.java:143)
at com.java.lambda.optional.OptionalDemo.main(OptionalDemo.java:10)
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