JAVA Simple loop problems. I know the answers(provided), so please explain how you get the answers. Thank you!

1.Answer is 321, how you get 321?

Assume correctly formatted code.

What prints if the following code is run

(if there is no output enter nothing) :

int t = 3;

do

{

System.out.print(t);

} while (t-- >= 2);

2. The answer is 35812. How you get 35812?

Assume correctly formatted code.

What prints if the following code is run

(if there is no output enter nothing) :

int sum = 2;

int x = 0;

while (x++ <= 3)

{

sum = sum + x;

System.out.print(sum);

}

3. The answer is 20, how you get 20?

Assume correctly formatted code.

What prints if the following code is run

(if there is no output enter nothing) :

int t = 3;

do

{

t--;

System.out.print(t);

} while (t-- >= 2);

4. The answer is 21, how is answer 21?

Assume correctly formatted code.

What prints if the following code is run

(if there is no output enter nothing) :

for (int y = 2; y > 0; --y)

{

System.out.print(y);

}

5. The answer is 21, how you get 21?

Assume correctly formatted code.

What prints if the following code is run

(if there is no output enter nothing) :

for (int y = 2; y > 0; y--)

{

System.out.print(y);

}