Review Collections Usage

[farhan5248]

Review consistent usage of collections like . ArrayList<String[]> with replace ArrayList<ArrayList> . HashMap vs TreeMap . Use filters rather than explicit for loops

[farhan5248]

search for these, then [] later

• [x] import java.util.Collections;
• [x] import java.util.List;
• [x] import java.util.ArrayList;
• [x] import java.util.Map;
• [x] import java.util.Map.Entry;
• [x] import java.util.HashMap;
• [x] import java.util.Set;