The codice_5 constructor initializes the frame by first calling the superclass constructor, passing the parameter codice_6, which is used as the window's title. It then calls the ' method inherited from codice_4 to set the default operation when the close control on the title bar is selected to ' this causes the codice_4 to be disposed of when the frame is closed (as opposed to merely hidden), which allows the Java virtual machine to exit and the program to terminate. Next, a is created for the string "Hello, world!" and the ' method inherited from the superclass is called to add the label to the frame. The ' method inherited from the superclass is called to size the window and lay out its contents.