CommonsLogClass commonsLogClass = new CommonsLogClass();
commonsLogClass.doSomething();
Slf4jClass slf4jLogClass = new Slf4jClass();
slf4jLogClass.doSomething();
DelegateClass delegate = new DelegateClass();
delegate.add("String2");
System.out.println(delegate.contains("String"));
System.out.println(delegate.contains("String2"));