如何检查字符串中的相同单词？

Question

My code takes a String input, separates them and locates the ones with a specific letter in them, then prints them. Now, i want to make sure the same word only prints once. For instance, if the input was " she looks nice, she is kind." then the output would be "she \\n nice" This is my current code:

    Scanner kybd = new Scanner(System.in);
String s = kybd.nextLine();
String[] arr = s.split(" ");    
for ( String ss : arr) {
    String []ary = {ss};
        for(int i = 0; i < ary.length; i++){
            int numindex = ss.indexOf("e");
            int numindex2 = ss.indexOf("E");
            if (numindex != -1){
                System.out.println(ary[i]);
            }
            else if(numindex2 != -1){
                System.out.println(ary[i]);
            }
        }
    }

Any suggestions on how to do this would be appreciated.

Answer 1

Add your words to a HashSet<String> .

Then loop through this HashSet and print out the words.
Even if there are duplicates (while you extract them),
they will be printed out once.

The HashSet will get rid of the duplicates for you
(it will do that while you insert them into the HashSet).

See here for details: HashSet