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Solve "unchecked warning" in Java avoiding @suppressWarnings


Solve "unchecked warning" in Java avoiding @suppressWarnings

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Solve "unchecked warning" in Java avoiding @suppressWarnings
Tag : java , By : user94076
Date : November 23 2020, 01:01 AM

Hope that helps This is a Trying to improve my code question. About generics and the unchecked warning; I do know about the @suppresswarnings annotation. The question is what am I suppose to code to suppress it. Take, please, the following code. , Lets look at the code in question, your class declaration:
public class NumericBox<T extends Number> implements Box<T>
public T insert(Number newElement) {
    T oldElement = this.element;
    this.element = (T) newElement;
    return oldElement;
}
final NumericBox<BigDecimal> box = new NumericBox<>();
box.insert(3);
final BigDecimal val = box.getElement();  <-- OOPS!
public T insert(T newElement) {
    T oldElement = this.element;
    this.element = (T) newElement;
    return oldElement;
}

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what can we benefit from using "@SuppressWarnings("unchecked")" in java?


Tag : java , By : Mossy Breen
Date : March 29 2020, 07:55 AM
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.

ArrayList method toArray in Java has @SuppressWarnings("unchecked") annotation


Tag : java , By : Willem van Schevikho
Date : March 29 2020, 07:55 AM
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

Java Generics: Why does my @SuppressWarnings("unchecked") work in this case, but not the other?


Tag : java , By : Aires
Date : March 29 2020, 07:55 AM
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];

Removal warning "Unnecessary @SuppressWarnings("unchecked")" will affect functionality?


Tag : android , By : Kenny
Date : March 29 2020, 07:55 AM
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.

Syntax of java @SuppressWarnings("unchecked") with inheritance of generic types


Tag : java , By : Chris Lomax
Date : March 29 2020, 07:55 AM
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");
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