public class Monkey {
    public static void main(String args[]){
        int sum = 1;
        for(int i = 1; i < 10; i++)
            sum = (sum + 1) * 2;
        System.out.println(sum);
    }
}

------解决方案--------------------
Java code
public class Test{
    public static void main(String args[])  {
        int peach=totalPeach(1);
        System.out.println(peach);
        
    }
    public static int totalPeach(int day){
        if(day==10){
            return 1;
        }
        return 2*(totalPeach(day+1)+1);
    }
}

------解决方案--------------------
用循环就这样写是不是容易理解？
Java code
public class Test{
    public static void main(String args[])  {
        int peach=totalPeach();
        System.out.println(peach);
        
    }
    public static int totalPeach(){
        int sum=1; //第10天的桃子数;
        for(int day=9;day>=1;day--){
            sum=(sum+1)*2;
        }
        return sum;
    }
}