Question

write a notice for the school notice board regard the recent out break of Corona virus (covid-19 pandemic) in your city and around the world asking the students to take necessary steps to control this deadly disease and prefect themselves .​

Answer 1

Answer:

Set guarantees that the collection will contain unique elements (no duplicates). A Collection does not guarantee this. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited. ... Two Set instances are equal if they contain the same elements