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ToggleFinding the sum of consecutive cube numbers is a common problem in programming. In this article, we will look at techniques for calculating sum of all cubes in Java Between 1 to n.

## Problem Statement

Given a number n, print sum of all cubes in java between 1 to n.

**Examples:**

```
Input: 3
Output: 36
```

**Explanation**

Cubes of first three natural numbers is ** 1^3 + 2^3 + 3^3 =36**.

## Print Sum Of All Cubes In Java Solution

We will discuss two solutions here:

- Naive Approach Using Loops
- Using Mathematical Formula

### Naive Approach

The idea here is to iterate from ** 1 to n using loop **and add the cube of current number to the sum.

**Java Code Implementation**

Let’s see Java Program for cube sum of first n natural numbers using Naive Approach

```
// Java Program for cube sum of first n natural numbers using Naive Approach
public class SumOfCubes {
// Method to calculate the sum of cubes of natural numbers up to n
public static long sumOfCubes(int n) {
long sum = 0; // Initialize sum to 0
for (int i = 1; i <= n; i++) {
sum += i * i * i; // Add the cube of the current number to the sum
}
return sum; // Return the computed sum
}
public static void main(String[] args) {
int n = 3; // Example input
long result = sumOfCubes(n); // Calculate the sum of cubes
System.out.println("The sum of cubes of first " + n + " natural numbers is: " + result);
}
}
```

**Output**:

`The sum of cubes of first 3 natural numbers is: 36`

**Time Complexity:** O(n).

This is because we have to loop through each number from `1`

to `n`

and perform a constant-time operation (cubing a number and adding it to the sum).

**Space Complexity**: O(1).

### Using Mathematical Formula

Mathematical Formula to get sum of cube of first n natural number is

To know the proof and derivation of this formula check out this article. We will use this formula to calculate sum of cubes of numbers between 1 to n.

**Java Code Implementation**

Let’s see Java Program for cube sum of first n natural numbers using Mathematical Formula

```
// Sum of cube of first n natural number in java using formula
public class SumOfCubes {
// Function to calculate the sum of cubes of the first n natural numbers
public static long sumOfCubes(int n) {
long sum = (long) n * (n + 1) / 2; // Sum of the first n natural numbers
sum *= sum; // Squaring the sum to get the sum of cubes
return sum;
}
public static void main(String[] args) {
int n = 5; // Example input
System.out.println("The sum of cubes of the first " + n + " natural numbers is: " + sumOfCubes(n));
}
}
```

**Output**:

`The sum of cubes of the first 5 natural numbers is: 225`

**Time Complexity:** O(1).

This is because the calculations are done in constant time. No matter the size of * n*, the computational steps remain the same

**Space Complexity**: O(1).

## Key Takeaways

- A naive iterative approach uses a loop to cube each number and add to the sum
- Mathematical formulas can calculate the sum in constant time without loops
- Time complexity is O(n) for iteration vs O(1) for the formula
- Understanding both methods provides a good overview of algorithmic approaches

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## FAQ

When would the iterative approach be preferred?

The iterative approach is easy to implement and understand. It may be preferred for small inputs or educational purposes.

Can this be done recursively?

Yes, the sum can also be calculated recursively without loops or formulas. This provides another programming technique.