The requireNonNull() method in Java, part of the java.util.Objects class, is used to check if a given object reference is not null. If the object reference is null, it throws a NullPointerException with an optional custom message.
The isNull() method in Java, part of the java.util.Objects class, is used to check if a given object reference is null.
The Objects.equals() method in Java, part of the java.util.Objects class, is used to determine whether two objects are equal. This method is a utility for null-safe comparison, meaning it handles null values gracefully.
The Objects.checkIndex() method in Java, part of the java.util.Objects class, is used to validate whether a given index is within the bounds of a specified range.