query: Java - getting error on Hashmap.put
positive_passages.docid: 49
positive_passages.text: What is a NullPointerException, and how do I fix it?
negative_passages.docid: 65609
negative_passages.text: Why does Java's hashCode() in String use 31 as a multiplier?
negative_passages.docid: 45905
negative_passages.text: Java Error - Illegal Modifier for Parameter - Only final Permitted
negative_passages.docid: 88423
negative_passages.text: What is the difference between the HashMap and Map objects in Java?
negative_passages.docid: 2398
negative_passages.text: ConcurrentModificationException for ArrayList
negative_passages.docid: 64704
negative_passages.text: Behaviour of LinkedHashMap's keySet() and values() methods
negative_passages.docid: 70294
negative_passages.text: HashMap and int as key
negative_passages.docid: 147879
negative_passages.text: Exception when taking a heapdump using JMAP
negative_passages.docid: 150361
negative_passages.text: Updating Java HashMap key
negative_passages.docid: 157906
negative_passages.text: When should I use the HashSet type?
negative_passages.docid: 80299
negative_passages.text: Java Error: Cannot make a static reference to the non-static method
negative_passages.docid: 51586
negative_passages.text: Using two (or more) objects as a HashMap key
negative_passages.docid: 43446
negative_passages.text: JSONException: Value of type java.lang.String cannot be converted to JSONObject
negative_passages.docid: 76854
negative_passages.text: When does HashSet 'add' method calls equals?
negative_passages.docid: 57929
negative_passages.text: How to read and write a HashMap to a file?
negative_passages.docid: 146732
negative_passages.text: How does a Java HashMap handle different objects with the same hash code?
negative_passages.docid: 53319
negative_passages.text: ArgumentException or ArgumentNullException for string parameters?