Java求一个分数数列的前20项之和的实现代码

publicclasstest20 {

  publicstaticvoidmain(String[] args) {

    floatfm = 1f;

    floatfz = 1f;

    floattemp;

    floatsum = 0f;

    for(inti=0;i<20;i++){

       temp = fm;

       fm = fz;

       fz = fz + temp;

       sum += fz/fm;

       //System.out.println(sum);

    }

    System.out.println(sum);

  }

}