问输出2个数组中的重复值

EN

public static void duplciates(){ //compares the two arrayLists dictionary and phoneWords and adds the duplicates to the duplicates arraylist
        for(String term: dictionary){
            if(phoneWords.contains(term)){
                duplicates.add(term);
            }
        }
    }

public static void openOutputFile (){
        try{
            writer = new FileWriter("E:\\output.txt");
        }
        catch(Exception e){
            System.out.println("you have an error");
        }

    }
    public static void writeArrayToFile(){
        for(String str: duplicates){
            try {
                writer.write(str);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }