判断一个对象是否是一个类的实例

方法一：使用instanceof关键字

String todayWeather = "Cloudy";
boolean isInstance = todayWeather instanceof String;
System.out.println(isInstance);

方法二：使用java.lang.Class的isInstance方法

String todayWeather = "Cloudy";
boolean isInstance = String.class.isInstance(todayWeather);
System.out.println(isInstance);