JAVA

Java How to use Set?

// Set implementation using HashSet
Set<String> animals = new HashSet<>();

java set operations

s1.containsAll(s2) — returns true if s2 is a subset of s1. (s2 is a subset of s1 if set s1 contains all of the elements in s2.)
s1.addAll(s2) — transforms s1 into the union of s1 and s2. (The union of two sets is the set containing all of the elements contained in either set.)
s1.retainAll(s2) — transforms s1 into the intersection of s1 and s2. (The intersection of two sets is the set containing only the elements common to both sets.)
s1.removeAll(s2) — transforms s1 into the (asymmetric) set difference of s1 and s2. (For example, the set difference of s1 minus s2 is the set containing all of the elements found in s1 but not in s2.)

what does .set do in java

public E set(int index, E element)
  //The set() method of 
  //java.util.ArrayList class is used to replace the 
  //element at the specified position in this list with 
  //the specified element.