Let's say nums is an ArrayList<Float> containing some numbers. How do I write a code that returns the sum of all the numbers in nums.

1. ArrayList<Float> nums;
2. for(Float s : nums);
3. return nums

Is this how it should be written to call a return as requested?

For random (1, 10), what is the smallest and the biggest integer value can it return?

For both smallest and biggest value is it 1 because 10 can never be returned.
Answer: smallest = 1 , biggest = 1

Is this right?

I am not sure if this is how it should be written.

Give the two dimensional point, write codes to make a new Point object and set its x variable to 4 and y variable to 2. Add a constructor to Point class that gives x and y initial values.

1. class Point {
2.       float x;
3.       float y;
4. }

my answer:

1. class Point {
2.       float x;
3.       float y;
4.       float x = 4;
5.       float y = 2;
6. // constructor
7. Point(float init_x, float init_y) {
   
8. x = init_x;
9. y = init_y;
10.   )
11. }

I have trouble working this out. Can anyone explain to me how does this math work?

int a;
int b;
a = 4;
b = 5;
a -= b;
b = a - b;
a = b;
println(a + b);

answer : 13