Скачать или смотреть Effective Ways to Split Text Files and Create String Arrays in Java

Discover how to split a text file and eliminate unwanted characters using Java. Learn step-by-step methods to convert text into a clean string array.
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Splitting Text Files and Creating String Arrays in Java

If you've ever worked with text files in Java, you may have encountered situations where you need to extract specific data from them. In particular, the challenge of splitting a text file into smaller parts based on certain patterns, and then storing those parts as strings in an array, can be daunting. Today, we will tackle this issue by addressing a common problem faced by many developers: how to split text in a file and eliminate unwanted characters.

The Problem

Imagine you have a text file containing approximately 2000 words formatted like this:

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Your objective is to read this file and store each word in a string array without the surrounding quotation marks. This challenge often arises when using the Scanner class, as shown in the following snippet:

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While the intention is clear, there's an issue: the words are being stored with quotation marks, resulting in output such as:

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This is not the desired outcome, and many developers might find themselves wondering: How can I split the text and strip these unwanted characters?

The Solution

To achieve a clean array of words, you need to enhance your approach. Here’s a step-by-step guide to solving this issue:

Step 1: Read the Content

You have already set up the Scanner to read the file, which is a great start. However, you may want to use a StringBuilder to aggregate all the words before processing them.

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This allows you to gather all the words in a single pass.

Step 2: Split the Words

After you have the entire content in a single string, it’s crucial to split it properly. Since your format is consistent, you can split it based on the comma (,):

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This line of code will break the string at each comma followed by a space.

Step 3: Clean Up Unwanted Characters

Now that you have your words in an array, it's time to remove the quotation marks ("). You can use the replaceAll method within a loop to accomplish this:

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This loops through each word in the wordArray and strips out the quotation marks.

Step 4: Output the Results

Now that your array is clean, you can print each element without the extra characters:

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Conclusion

By following these straightforward steps, you can successfully read a text file, split it into an array, and remove unwanted characters. The key to these operations lies in effectively manipulating strings, making Java's built-in methods your best friends.

With these techniques in your toolkit, you can handle any text file with confidence. Happy coding!