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class OneSingleton {
 private static OneSingleton instance = new OneSingleton();
 private static int number = 0;
 private OneSingleton() {}
 public static OneSingleton getInstance() {
  return instance;
 }
 public synchronized int getNumber() {
  return number;
 }
 public synchronized void nextNumber() {
  number++;
 }
}
class TwoSingleton {
 private static TwoSingleton instance = null;
 private static int number = 0;
 private TwoSingleton() {}
 public static synchronized TwoSingleton getInstance() {
  if(instance == null) {
   instance = new


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