Does order of operators matter when using compound assignment in Java? (+= vs =+)

Question

I have this test code and I am trying to check if sum =+ value is equal to sum = sum + value . In Java, is this acceptable? It compiles and runs on my machine.

public class sum {
    public static void main(String[] args) {
        int sum = 0;
        int value = 5;

        sum =+ value;
        System.out.println(sum);

        sum = 0;
        sum = sum + value;

        System.out.println(sum);
    }
}

Answer 1

Yes, it matters.

There is no =+ operator. It's, in fact, two operators - = (assignment), followed by + (unary plus). sum =+ value could be written as sum = (+value) , which just evaluates to sum = value .

On the other hand += is a proper operator using for addition sum += value means sum = sum + value .