下面程序的执行结果是 public class Weather { public static void main (String [] args) { int shiDu = 45; // 湿度 if (shiDu >= 80) { System.out.println ("要下雨了"); } else if (shiDu >= 50) { System.out.println ("天很阴"); } else if (shiDu >= 30) { System.out.println ("很舒适"); } else if (shiDu >= 0) { System.out.println ("很干燥"); } } }