Bài tập nạp chồng phương thức trong Java | Codelearn

Task

Create an ArrayCalculator class in the file ArrayCalculator.java with the following information:

Explanation

• ArrayCalculator is a class without attributes.
• sumOfArray(arr: int[]) is a static method of which the input is an array of integers and it returns the sum of this array.
• sumOfArray(arr: double[]) is a static method of which the input is an array of double numbers and it returns the sum of this array.

A program to test the above ArrayCalculator class: 

class Entry {
	public static void main(String[] args) {
		int[] arr1 = new int[] {3, 4, 2};
		double[] arr2 = new double[] {1.3, 4.2, 6.7};
		System.out.println(ArrayCalculator.sumOfArray(arr1));
		System.out.println(ArrayCalculator.sumOfArray(arr2));
	}
}

When the above code is compiled and executed, it produces the following result:

9
12.2

Instruction

Code sample:

public class ArrayCalculator {
	public static int sumOfArray(int arr[]) {
		int sum = 0;
		for (int i = 0; i < arr.length; i++) {
			sum += arr[i];
		}
		return sum;
	}

	public static double sumOfArray(double arr[]) {
		double sum = 0;
		for (int i = 0; i < arr.length; i++) {
			sum += arr[i];
		}
		return sum;
	}
}