编写Java程序，求1+2/1+3/2+4/3+5/5+6/8+7/13+...前20项之和

以下是Java程序，求1+2/1+3/2+4/3+5/5+6/8+7/13+...前20项之和的代码：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        int n = 20;
        double sum = 0.0;
        double a = 1.0, b = 2.0;
        for (int i = 1; i <= n; i++) {
            sum += b / a;
            double temp = b;
            b = a + b;
            a = temp;
        }
        System.out.printf("%.4f", sum);
    }
}

输出结果为：32.6603