Easy java Solution
class Solution {\n    Set set=new HashSet<>();\n    public int numUniqueEmails(String[] emails) {\n        \n        for(String s: emails)\n        {\n         
class Solution {\n    Set<String> set=new HashSet<>();\n    public int numUniqueEmails(String[] emails) {\n        \n        for(String s: emails)\n        {\n            String d[]=s.split("@");\n            StringBuilder ans=new StringBuilder("");\n            for(int i=0;i<d[0].length();i++)\n            {\n                \n                if(d[0].charAt(i)==\'+\')\n                    break;\n                if(d[0].charAt(i)!=\'.\')\n                ans=ans.append(d[0].charAt(i));       \n            }\n            // System.out.println(ans+"@"+d[1]);\n                ans.append("@");\n                ans.append(d[1]);\n            set.add(ans.toString());\n        }\n        return set.size(); \n    }\n}
['String', 'Ordered Set', 'Java']