Java输出斐波那契数列前20项之和

好的，您可以使用以下代码输出斐波那契数列前20项之和：

public class FibonacciSum {
    public static void main(String[] args) {
        int n = 20;
        int sum = 0;
        int[] fib = new int[n];
        fib[0] = 0;
        fib[1] = 1;
        for (int i = 2; i < n; i++) {
            fib[i] = fib[i - 1] + fib[i - 2];
        }
        for (int i = 0; i < n; i++) {
            sum += fib[i];
        }
        System.out.println("斐波那契数列前20项之和为: " + sum);
    }
}