程式需要被幫忙修改一下

public class Main {
public static void main(String args[]){
int i=1;int j=0;

do{
do{
System.out.print("*");
j++;
}while(j<i);
i++;System.out.print("\n");
j=0;
}while(i<4);

i -= 2;
do{
do{
System.out.print("*");
j++;
}while(j<i);
i--;
System.out.print("\n");
j=0;
}while(i>0);
}
}

// Note that the loops I have added is just like yours except they
// decrement instead of increment