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nullpointerexception
William
William

Reputation: 31

How can I resolve the "NullPointerException" error in Java when accessing an object in a method?

How can I resolve the "NullPointerException" error in Java when accessing an object in a method?

Upvotes: 2

Views: 41

Answers (2)

Bel homme
Bel homme

Reputation: 71

Java8 has added many new features, one of which is the Optional class. The Optional class has become part of the Java 8 class library and is used to solve the NullPointerException.

Optional.of(T value) Creates an Optional object containing a non-null value. If value is null, a NullPointerException is thrown.

Optional.ofNullable(T value) Creates an Optional object that may contain a null value. If value is null, returns an empty Optional object.

Optional.empty() Creates an empty Optional object.

Optional<String> optional = Optional.of("Hello");
Optional<String> optionalNullable = Optional.ofNullable(null);
Optional<String> emptyOptional = Optional.empty();

You can find more usage of it in the doc.

Upvotes: 2

Harry
Harry

Reputation: 47

Check the object is null or enclose with try and catch

sol1: if(mainObject && mainObject.yourObject != null { /** add what yuo what you want to handle*/ }

Sol2: try{obj = mainObject.yourObject;}catch(Exception e){/** fallback code*/}

Upvotes: 1

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