How to Call Methods in Main Class in Java?

Learn how to effectively call the `runningSum` method from the main class in Java using a new array of integers.
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How to Call Methods in Main Class in Java?

Java programming often requires you to call methods within your class efficiently. If you're working on an array and need to return results from a method like runningSum, it might seem tricky at first. In this post, we’ll break down how to call the runningSum method inside the main class with a new array of integers. We’ll also provide a step-by-step guide to achieve this.

Understanding the Problem

You have a method named runningSum that calculates the cumulative sum of an array of integers. However, calling this method from the main method can be confusing if you haven't declared it as static. Many beginners struggle with understanding how to properly utilize methods from the main execution context. So, let’s simplify that process!

The Original Code

Here’s a quick look at the original Java class you might have:

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Solution Steps

1. Modify the Method

To successfully call a method such as runningSum from the main method, it must be static. This allows it to be invoked without creating an instance of the class. Here’s how to modify your method declaration:

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By adding static, the method can be called directly from main.

2. Setup Your Array

You need to initialize an integer array that you want to perform the cumulative sum on. For example:

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This array will be passed to the runningSum method to compute the results.

3. Call the Method

After setting up your array, you can call the runningSum method and store the output in another array:

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4. Print the Results

To see the output of the runningSum method, iterate through the result array and print each value. This can be done using a simple loop:

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Complete Code Example

Here’s the complete implementation of your main class after applying the necessary changes:

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Conclusion

By following these simple steps, you can effectively call methods in your Java program from the main class. Remember to declare your methods as static if you plan on calling them directly from main. This approach not only streamlines your code but also ensures that it adheres to good programming practices. Happy coding!