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  1. import java.util.ArrayList;
  2. import java.util.Collections;
  3. import java.util.List;
  4.  
  5. class Ideone {
  6. 	public static void main (String[] args) {
  7. 		char mat[][] = new char[5][5];
  8. 		List<Integer> random = randomNumbers(65, 90, 25);
  9. 		int posicao  = 0;
  10.         for (int ctlin = 0; ctlin < 5; ctlin++)
  11.             for (int ctcol = 0; ctcol < 5; ctcol++)
  12.                 mat[ctlin][ctcol] = (char)(int)random.get(posicao++);
  13.         for (int ctlin = 0; ctlin < 5; ctlin++) {
  14.             for (int ctcol = 0; ctcol < 5; ctcol++)
  15.                 System.out.print(mat[ctlin][ctcol] + " ");
  16.             System.out.println();
  17.         }       
  18. 	}
  19.     public static List<Integer> randomNumbers(int start, int end, int count) {
  20. 		List<Integer> lista = new ArrayList<>(end - start + 1);
  21. 		for (int i = start; i <= end; i++) {
  22. 		    lista.add(i);
  23. 		}
  24. 		Collections.shuffle(lista);
  25. 		lista = lista.subList(0, count);
  26. 		return lista;
  27.     }
  28. }
Success #stdin #stdout 0.1s 320576KB
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B C E F I 
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D G M L Q 
V Y N U J
https://ideone.com/OgoFUB
language:
Java (12.0.1)
created:
8 years ago
visibility:
public

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