Main Hello World This is the title of the window. We want to greet to the world. This is an extra information. (I couldn't think of any realistic comment here. 「こんにちは世界」だと機械翻訳感がでるので、「世界よ、ごきげんよう」にしてみました。 世界よ、ごきげんよう Hello World! This is the text that will be displayed in the center of the Window. This is an extra information. (Again, I couldn't think of any realistic comment. こちらも「こんにちは世界！」は避けました。 ごきげんよう！世界