"Java Daily question" 201612015

 PackageDec2016; ImportJava.util.HashSet;  Public classQues1205 { Public Static voidMain (string[] args) {StringBuffer sb1=NewStringBuffer ("123"); StringBuffer SB2=NewStringBuffer ("123"); StringBuffer SB3=NewStringBuffer ("123"); StringBuffer SB4=NewStringBuffer ("123"); HashSet<StringBuffer> set =NewHashset<stringbuffer>();          Set.add (SB1);          Set.add (SB2);          Set.add (SB3);            Set.add (SB4);      System.out.println (Set.size ()); }  }

Today's question:
What is the output of the main program? (Click on the "Java Daily question" 20161205 "to view the 20161202 problem resolution)

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"Java Daily question" 201612015