Скачать или смотреть How to Properly Read a String Array into an Object Array in Java

Learn how to efficiently convert a string array from a file into an object array in Java. This guide helps you avoid common pitfalls and improve your coding skills.
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This video is based on the question https://stackoverflow.com/q/64706389/ asked by the user 'alice smith' ( https://stackoverflow.com/u/14543911/ ) and on the answer https://stackoverflow.com/a/64706472/ provided by the user 'Bohemian' ( https://stackoverflow.com/u/256196/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Reading a String Array into an Object Array in Java

When you're working with data files in Java, you might find yourself needing to convert a string array into an object array, especially when dealing with CSV (Comma-Separated Values) files. A common issue many developers face is reading a file where every line contains different values, but only the first line's data gets displayed repeatedly in the output. In this post, we’ll explore this problem and provide a simple solution to help you avoid this pitfall.

The Problem

You might encounter a situation similar to this when trying to read a CSV file into an array of objects. An example of the code that might lead to confusion is shown below:

[[See Video to Reveal this Text or Code Snippet]]

In the example above, when printed, the clothes array shows the data from the first line multiple times. This occurs because the variables for name, style, colour, and brand are set to the first line's values and are reused in the loop that creates objects.

Understanding the Solution

To fix this issue, you'll need to ensure that each time you read a line from the file, a new Clothes object is created and populated with the current line's data. Here’s how to do that:

Step-by-Step Breakdown

Declare an index variable: This variable will track the position in the clothes array where the new Clothes object will be stored.

Read the file line by line: Continue to read each line until there are no more lines to read.

Split the line: Use the split method to separate the line into individual components based on the delimiter (,).

Create a new object for each line: For each line read, immediately create a new Clothes object and store it in the array.

Updated Code Example

Here’s the modified code that implements these steps:

[[See Video to Reveal this Text or Code Snippet]]

Output the Results

When you print the results after implementing the above solution, you should see the unique clothing items as expected:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following this approach, you ensure that each object in your Clothes array corresponds to a distinct line in your CSV file. This way, you avoid the confusion of having the same data repeated and make your code cleaner and more functional.

Final Thoughts

Reading data into object arrays can be tricky, especially for beginners. But with the right understanding and an organized approach, you can easily handle data files and correctly populate your Java arrays with the relevant objects. Happy coding!