query: hashCode() and NullPointerException
positive_passages.docid: 49
positive_passages.text: What is a NullPointerException, and how do I fix it?
negative_passages.docid: 21472
negative_passages.text: HttpURLConnection.getResponseCode() throws IOException when code is known
negative_passages.docid: 103930
negative_passages.text: How to ensure hashCode() is consistent with equals()?
negative_passages.docid: 108111
negative_passages.text: Use Objects.hash() or own hashCode() implementation?
negative_passages.docid: 40587
negative_passages.text: Why not allow an external interface to provide hashCode/equals for a HashMap?
negative_passages.docid: 480
negative_passages.text: What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?
negative_passages.docid: 74320
negative_passages.text: Java Hashmap: How to get key from value?
negative_passages.docid: 64332
negative_passages.text: avoiding null reference exceptions
negative_passages.docid: 108024
negative_passages.text: What are the differences between a HashMap and a Hashtable in Java?
negative_passages.docid: 10581
negative_passages.text: Avoiding NullPointerException in Java
negative_passages.docid: 66284
negative_passages.text: NullPointerException when Creating an Array of objects
negative_passages.docid: 47947
negative_passages.text: Is Object.GetHashCode() unique to a reference or a value?
negative_passages.docid: 81518
negative_passages.text: Find out what variable is throwing a NullPointerException programmatically
negative_passages.docid: 141129
negative_passages.text: InputStream returning NullPointerException (Java)
negative_passages.docid: 96046
negative_passages.text: Static fields on a null reference in Java
negative_passages.docid: 62369
negative_passages.text: Iterate through a HashMap
negative_passages.docid: 150361
negative_passages.text: Updating Java HashMap key