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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		    String[][] students = {{"Bobby", "87"}, {"Charles", "100"}, {"Eric", "64"}, {"Charles", "22"}};
  13.             Map<String, List<String>> map = new HashMap<>();
  14.             List<String> score1;
  15.  
  16.             for(int i = 0; i < students.length; i++) {
  17.             	score1 = map.get(students[i][0]);
  18.             	if (score1 == null) {
  19.             	    score1 = new ArrayList<>();
  20.             	    map.put(students[i][0], score1);
  21.             	}
  22.             	map.get(students[i][0]).add(students[i][1]);
  23.             }
  24.             System.out.println(map.toString());
  25. 	}
  26. }
Success #stdin #stdout 0.04s 2184192KB
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Standard input is empty
stdout
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{Charles=[100, 22], Eric=[64], Bobby=[87]}
https://ideone.com/SJpTHs
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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