Nov 22, 2011 · I'd recommend building an index file. Scan the input file and write every key and its offset into a List, then sort the list and write it to the index file. Then, whenever you want to look up a key, you read in the index file and do a binary search on the list.

Feb 28, 2011 · An index file is just a mapping Word -> Location. For simple problems you can build that on your own using a Multimap from the word to the locations of the word in the file. If you need stop lists, stemming and other language processing, pre-, post-, or infix-search you should consider a search engine.

Oct 19, 2016 · I'm trying to create a simple indexOf() method that returns an int value and that recognizes a string (not char) of an string array. public int indexOf(String str) { /*Getting and return the index of the first *occurrence of the specified String.

Indexing a book. Write a program that reads in a text file from standard input and compiles an alphabetical index of which words appear on which lines, as in the following input. Ignore case and punctuation. For each word maintain a list of location on which it appears. Try to use HashTable and/or HashMap class (of java.util).

The indexOf() method returns the position of the first occurrence of specified character (s) in a string. Tip: Use the lastIndexOf method to return the position of the last occurrence of specified character (s) in a string. One of the following: Find the first occurrence of the letter "e" in a string, starting the search at position 5:

Jul 19, 2022 · The author explains the main idea of indexes and how to create them in Java. Creating fast search using the right data structures.

Dec 9, 2024 · One of the simplest and most straightforward ways to find the index of an element in an array is by using a loop. You can iterate through the array and compare each element with the target element. When a match is found, you return the index. Java

Dec 9, 2024 · In Java, to find the index of a specific element in an array, we can iterate through it and checking each element. There are several ways to achieve this, including using loops, utility functions, Arrays.asList() for non-primitive arrays, and Streams.

Apr 8, 2025 · Using ListIterator, we can traverse the list in both forward and backward directions. Example: Lets get deep dive onto creating objects or instances in a List. List is an interface, objects cannot be created of the type list. We always need a class that implements this List in order to create an object.

In Java, we can use the HashMap class from the Java Collections Framework to create an index. HashMap essentially uses a hash table for implementation where an index value (key) is associated with a specific data value. This allows for constant time (O(1)) data retrieval. Here's a …