nullpointerexception java string

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Why do I get a NullPointerException when comparing ...
A NullPointerException occurs because ` equals()` cannot be called on a null object , as null doesn't have an `equals()` method. Use ` ...

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Ошибка Null Pointer Exception, как исправить
7 июл. 2021 г. — Удалить повторяющиеся строки из массива strings, заменив их на null (null должны быть не строками "null"). Примеры. Массив после чтения строк

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What is a NullPointerException, and how do I fix it?
15 мая 2023 г. — A NullPointerException in Java is one of the most common errors. It means that you are trying to access a part of something that doesn't exist .

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NullPointerException (Java Platform SE 8 )
A NullPointerException occurs when an application tries to use null where an object is needed , such as calling a method on a null object.

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Как понять NullPointerException / Хабр
29 апр. 2014 г. — К примеру, java .lang.System.setProperty кидает NPE с сообщением «key can't be null», если вы передали в качестве key null. Если вы каждый ...

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How to Catch and Fix NullPointerException in Java
19 июн. 2024 г. — The java.lang.NullPointerException occurs when trying to use a variable that does not point to an object and refers to nothing or null.

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NullPointerException in case of String in java | by idiot
A NullPointerException (NPE) in Java occurs when you try to use an object reference that has not been initialized (ie, it is null).

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How To Fix NullPointerException in Java? 5 Causes and ...
8 авг. 2024 г. — This error means you're trying to call a method or access a property on a null object . For example, if String str = null; and you try str.length ...

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Null Pointer Exception in Java
5 авг. 2025 г. — A NullPointerException in Java is a RuntimeException . It occurs when a program attempts to use an object reference that has the null value.

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java - Ошибка NullPointerException при замене значений ...
Ошибка возникает в другой строчке, а именно в if( strings [i].equals( strings [j])) в тот момент, когда в strings [j] уже лежит null .