Question

Write in Java

1. (10 pts) Write a public method named “Even_Sum” that accepts a one-dimensional array of integers and returns the sum of the even elements in the array

2. (10 pts) Write a public method named “Reverse” that receives a string prints its contents in reverse to the standard output using a stack. Assume the stack has been created and is empty.

Answer 1

// 1)
public static int Even_Sum(int[] arr) {
    int sum = 0;
    for (int i = 0; i < arr.length; i++) {
        if (arr[i] % 2 == 0)
            sum += arr[i];
    }
    return sum;
}

// 2)
public static void Reverse(String s) {
    Stack<Character> stack = new Stack<>();
    for (int i = 0; i < s.length(); i++) {
        stack.push(s.charAt(i));
    }
    while (!stack.isEmpty()) {
        System.out.print(stack.pop());
    }
    System.out.println();
}