Solve "unchecked warning" in Java avoiding @suppressWarnings

like below fixes the issue It's there to suppress the warning generated by (E) elementData[lastRet = i], which for the compiler is type unsafe. The compiler can not garauntee that the casting will succeed at runtime.
But since the the person who wrote the code knew that it was always going to be safe, decided to use @SuppressWarnings("unchecked") to suppress the warning at compilation.

I hope this helps you . checking its API docs it clearly says that

public static <T,U> T[] copyOf(U[] original,
                           int newLength,
                           Class<? extends T[]> newType)

Returns:
     a copy of the original array, truncated or padded with nulls to obtain the 
     specified length

help you fix your problem Question is similar to this Why do we have to use an intermediary variable for @SuppressWarnings("unchecked")?, but I couldn't glean a solution from that one. , This will compile:

@SuppressWarnings("unchecked") // this is okay because [insert reasoning here]
private LinkedListDemo<S, T>[] table =
        (LinkedListDemo<S, T>[]) new LinkedListDemo<?, ?>[10];

should help you out No.Removing the Suppress Warnings will not affect any part of your code ....
Suppress Warnings Indicates that the named compiler warnings should be suppressed in the annotated element (and in all program elements contained in the annotated element). Note that the set of warnings suppressed in a given element is a superset of the warnings suppressed in all containing elements. For example, if you annotate a class to suppress one warning and annotate a method to suppress another, both warnings will be suppressed in the method.

may help you . Using raw types to disable generic type-checking is a bad idea. For the first problem, instead of trying to force an object of unknown type into a generic method parameter of unknown type, you should tell Pojo to pass itself the field value internally:

public T updateFromPrevious() {
    return updatePhase(getPreviousPhase());
}

Pojo<?,?> pojo = someService.get(id);
pojo.updateFromPrevious();
Map<String, String> myMap = pojo.getMap();
myMap.put("1", "2");