java - 为什么小程序中允许使用非静态方法？

Question

我注意到，在 java 应用程序中向包含 main 方法的类添加一个非静态方法，然后从 main 方法中调用它会导致编译错误。这我能理解，因为这个类从未被实例化。

但是，将非静态方法添加到 Applet 类并从内部调用它，比方说，paint 方法工作正常。为什么是这样？ applet 类是否由 appletviewer 以某种方式实例化，或者是否有另一种解释为什么前者不允许而后者允许？

Answer 1

Is the applet-class somehow instantiated by appletviewer

当然。查看"Life Cycle of an Applet"节Applets tutorial .特别是:

As a result of the applet being loaded, you should see the text "initializing... starting...". When an applet is loaded, here's what happens:

• An instance of the applet's controlling class (an Applet subclass) is created.
• The applet initializes itself.
• The applet starts running.