The java.util.Objects Class
Basic use for object null check
For null check in method
Object nullableObject = methodReturnObject();
if (Objects.isNull(nullableObject)) {
return;
}
For not null check in method
Object nullableObject = methodReturnObject();
if (Objects.nonNull(nullableObject)) {
return;
}
Objects.nonNull() method reference use in stream api
In the old fashion way for collection null check
List<Object> someObjects = methodGetList();
for (Object obj : someObjects) {
if (obj == null) {
continue;
}
doSomething(obj);
}
With the Objects.nonNull
method and Java8 Stream API, we can do the above in this way:
List<Object> someObjects = methodGetList();
someObjects.stream()
.filter(Objects::nonNull)
.forEach(this::doSomething);