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public class MySingleton {
 private static MySingleton _instance;

 private MySingleton() {
  // construct object . .
 //  private constructor prevents instantiation by outside callers
 }

 // lazy initialization
 public static synchronized MySingleton getInstance() {
  if (_instance==null) {
   _instance = new MySingleton();
  }
  return _instance;
 }

public Object clone() throws CloneNotSupportedException {
 throw new CloneNotSupportedException();
}

  // Remainder of class definition . . .
}