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What is the purpose of
Objects.isNull(x) if we can simply write
x == null ?
Same for
Objects.nonNull(...) and
x != null 
449
The nonNull method is a static method of the Objects class in Java that checks whether the input object reference supplied to it is non-null or not. If the passed object is non-null, then the method returns true. If the passed object is null , then the method returns false.
requireNonNull. Checks that the specified object reference is not null and throws a customized NullPointerException if it is. Unlike the method requireNonNull(Object, String) , this method allows creation of the message to be deferred until after the null check is made.
Typically, you'll check for null using the triple equality operator ( === or !== ), also known as the strict equality operator, to be sure that the value in question is definitely not null: object !== null . That code checks that the variable object does not have the value null .
In order to check whether a Java object is Null or not, we can either use the isNull() method of the Objects class or comparison operator.
From the JavaDoc of the method:
API Note: This method exists to be used as a
Predicate,filter(Objects::isNull)
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