query: Want to unique number out of my file read | error - java.lang.NullPointerException
positive_passages.docid: 49
positive_passages.text: What is a NullPointerException, and how do I fix it?
negative_passages.docid: 5236
negative_passages.text: How can I repeatedly read user input using Scanner java
negative_passages.docid: 12736
negative_passages.text: How to handle infinite loop caused by invalid input (InputMismatchException) using Scanner
negative_passages.docid: 52460
negative_passages.text: How to improve my code to correctly count unique lines?
negative_passages.docid: 55274
negative_passages.text: Java: Exception itself is null
negative_passages.docid: 94790
negative_passages.text: How to use readline() method in Java?
negative_passages.docid: 140408
negative_passages.text: Count distinct values of a field in a file
negative_passages.docid: 137692
negative_passages.text: NullPointerException when working with arrays
negative_passages.docid: 156435
negative_passages.text: FileNotFoundException, the file exists Java
negative_passages.docid: 61855
negative_passages.text: Generating Unique Random Numbers in Java
negative_passages.docid: 120071
negative_passages.text: Checking for a null int value from a Java ResultSet
negative_passages.docid: 6452
negative_passages.text: Clear contents of a file in Java using RandomAccessFile
negative_passages.docid: 145499
negative_passages.text: How to write data with FileOutputStream without losing old data?
negative_passages.docid: 146288
negative_passages.text: How do I read from a File to an array
negative_passages.docid: 26597
negative_passages.text: How to read an entire file to a string using C#?
negative_passages.docid: 26098
negative_passages.text: Rename a file using Java
negative_passages.docid: 11753
negative_passages.text: Java says FileNotFoundException but file exists