What does object method mean?

The object is the actual component of programs, while the class specifies how instances are created and how they behave. method: a method is an action which an object is able to perform . sending a message. sending a message to an object means asking the object to execute or invoke one of its methods.

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What is objects :: nonNull?

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.

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