instanceof关键字用法

		//instanceof关键字用于判断一个引用类型变量所指向的对象是否是一个类（或接口、抽象类、父类）的实例
		
		if(new Date() instanceof Date) {
			System.out.println("yes1");
		}
		
		if(new Date() instanceof Comparable) {
			System.out.println("yes2");
		}
		
		if(new SimpleDateFormat() instanceof DateFormat) {
			System.out.println("yes3");
		}
		String [] arr = {"34","23","12"};
		if(arr instanceof String []) {
			System.out.println("yes4");
		}
//结果
yes1
yes2
yes3
yes4