在类Telphone属性设置为public screen中，在main方法中写成对象名.属性（）即hello2.screen=6.0f是对screen赋值，能输出结果；但是写成hello2.screen(6.0f)就不对，显示错误，请问这是什么原因，这两者有什么区别？
光阴似箭催人老，日月如移越少年。
For variables, the equal sign is an assignment operation. The following writing method is to call a method called screen with a float parameter. Of course, if you don’t have this method, an error will be reported.
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For variables, the equal sign is an assignment operation. The following writing method is to call a method called screen with a float parameter. Of course, if you don’t have this method, an error will be reported.