Скачать или смотреть Creating a 2D Array from 1D Arrays by Excluding Certain Values in Java

Discover how to pair values from 1D arrays into a 2D array in Java while excluding specific values efficiently.
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Creating a 2D Array from 1D Arrays by Excluding Certain Values in Java

Have you ever faced the challenge of pairing values from one-dimensional (1D) arrays into a two-dimensional (2D) array while excluding certain values? In Java, this can be particularly tricky, primarily when dealing with negative or placeholder values.

In this guide, we walk you through a practical example of how to achieve this in a clear and concise manner. We will take two arrays, arr1 and arr2, and create a 2D array while excluding pairs where one of the values is -1.

The Problem

Suppose we have the following two 1D arrays:

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

Our goal is to create a 2D array that looks like this:

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

Notice that every time there is a -1 in arr1, we exclude that value and its corresponding value from arr2.

The Solution

To tackle this problem, we'll go through the following steps in our Java program:

Filter Out Values: Start by filtering out the -1 values.

Create a Result Array: Initialize a 2D array to store the resulting pairs.

Pair Values: Loop through both arrays, adding valid pairs to the result array.

Step 1: Filter Out Values

We can first determine how many valid (non -1) values are present in both arrays.

Step 2: Create a Result Array

Next, we create a new 2D array that can hold the filtered pairs.

Step 3: Pair Values

Now, we can iterate through the original arrays and collect pairs of values that are not -1.

Below is a simple Java implementation of the aforementioned steps:

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

Explanation of the Code

Import Statements: We import the necessary classes. Arrays class will help us print the 2D array easily.

Initialization: Declare both arrays and compute their valid lengths using Java Streams.

Result Array: We dynamically create the result array based on the number of valid pairs we are going to collect.

Looping Through Arrays: Here, we check each index; if neither element is -1, we store the values in the 2D result array.

Final Output

When you run the above code, it will successfully output:

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

Conclusion

This simple yet effective method allows you to pair values from two 1D arrays into a 2D array in Java while easily excluding unwanted values. By following these steps, you can handle similar problems in your programming tasks efficiently.

Feel free to modify the code to fit your specific needs, and happy coding!