How to declare a generic collection in java Yasser Ibrahim @Jobilize

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Question 210 / 297: How can this program be modified to make use of appropriate generic types? (one modification for each line)
Choose 3

import java.util.*;

public class Test {

	public static void main(String[] args) {
		List ids = new ArrayList(); // Line 1
		ids.add(123);
		ids.add(999);
		
		Map students = new HashMap(); // Line 2
		students.put("Jess",ids.get(0));
		students.put("Jimmy",ids.get(1));
		
		int x = ((Long)students.get("Jimmy")).intValue(); // Line 3
		
	}
}

replace line 1 with List<Integer> ids = new ArrayList<Integer>();

replace line 1 with List<Long> ids = new ArrayList<Long>();

replace line 2 with Map<Integer,String> students = new HashMap<Integer,String>();

replace line 2 with Map<String,Integer> students = new HashMap<String,Integer>();

replace line 3 with int x = students.get("Jimmy");

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