Question

I’m wondering what kind method should I use to search the elements in an array and what data structure to store the return value

For example a txt file contains following

123 Name line Moon night table
124 Laugh Cry Dog
123 quote line make pet table
127 line array hello table

and the search elements are line+table
I read every line as an string and then spilt by space

the output should like this

123 2 (ID 123 occurs twice that contains the search elements)
127 1

I want some suggestions of what kind method to search the elements in the array and what kind data structure to store the return value (the ID and the number of occurs. I’m thinking hashmap)

Answer 1

Read the text file and store each line that ends with table in ArrayList<String>. Then use contains for each element in ArrayList<String>. Store result in HashMap<key,value> where key is ID and value is Integer which represent number of times ID occurs.