Random r = new Random();
final int bound = 50; // sorunun zorluguna gore degisen lineer bir fonksyon , 10 - 50 arasi.
int a = r.nextInt(bound);
int b = r.nextInt(bound);
int c = r.nextInt(bound);
int d = 100 - (a + b + c);
System.out.println(String.format("%s , %s , %s, %s", a, b, c, d));