yes. it is very important to know about class Object. for the firsst important thing to note about Object class is that all the classes in
java are inherited from the class Object. even the program which you code will also automatically extend Object class. this implicitly mean that all classes in java API will extent Object class implicitly. so any program can override the methods which are present in the Object class.
eg: toString(), hashcode(), finalize(), equals() etc..