While Loop - How Result Being Replace If It Only Equals To 1

I was reading a book and came across this while loop.

public class Powers {
public static void main (String [] args){
int e;
int result;
for(int i = 0; i < 10; i++){

[Code] .....

This loop presents the following (I'm sure it's not necessary):

2 to the 0 power is 1
2 to the 1 power is 2
2 to the 2 power is 4
2 to the 3 power is 8
2 to the 4 power is 16
2 to the 5 power is 32
2 to the 6 power is 64
2 to the 7 power is 128
2 to the 8 power is 256
2 to the 9 power is 512

I am just having a difficult time understand and grasping this concept. My main issue is result *=2; this is making it very difficult to understand. How is result being replace if it only equals to 1.