Java - Null

About

Data Type - Null Value in Java

Function

From javase/9/docs/api/java/util/objects.html

• requireNonNull

<code java>
import static java.util.Objects.requireNonNull;
.....
public constructor(String s)
{
    this.s = requireNonNull(s, "s is null");
}

• isNull
• nonNull

See also:

• javase/9/docs/api/java/util/Optional.html. A container object which may or may not contain a non-null value.