scala> :paste // Entering paste mode (ctrl-D to finish) trait SuperMain extends App { def printClassName(): Unit println("Start") printClassName() println("Finish") } object Main1 extends SuperMain { def printClassName(): Unit = println("Main1") } object Main2 extends SuperMain { def printClassName(): Unit = println("Main2") } // Exiting paste mode, now interpreting. defined trait SuperMain define
![実際にあった scala.App の怖い間違い (解説編) - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/261a1527377c5c8f85bc0c029af2b3971c73d493/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-412672c5f0600ab9a64263b751f1bc81.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTk3MiZoPTM3OCZ0eHQ9JUU1JUFFJTlGJUU5JTlBJTlCJUUzJTgxJUFCJUUzJTgxJTgyJUUzJTgxJUEzJUUzJTgxJTlGJTIwc2NhbGEuQXBwJTIwJUUzJTgxJUFFJUU2JTgwJTk2JUUzJTgxJTg0JUU5JTk2JTkzJUU5JTgxJTk1JUUzJTgxJTg0JTIwJTI4JUU4JUE3JUEzJUU4JUFBJUFDJUU3JUI3JUE4JTI5JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmcz05NTkxMTQzMWQ5YmNmZThiMDdiNzI2MzI5MzllMjUwYQ%26mark-x%3D142%26mark-y%3D57%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZoPTc2Jnc9NzcwJnR4dD0lNDBrYXdhY2hpJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz1lOTA2N2I3MWI0ZDFiYmNlOGRhMjViZmE4NzkzN2JhYg%26blend-x%3D142%26blend-y%3D436%26blend-mode%3Dnormal%26txt64%3DaW4g5qCq5byP5Lya56S-RkxJTlRFUlM%26txt-width%3D770%26txt-clip%3Dend%252Cellipsis%26txt-color%3D%2523212121%26txt-font%3DHiragino%2520Sans%2520W6%26txt-size%3D36%26txt-x%3D156%26txt-y%3D536%26s%3D50e9b02f86f573178a97d959add21d68)