3 回答程序提示黃色燈泡

2 回答public class HelloWorld{ public static void main(String[] args) { System.out.println(hobby); } }

3 回答錯誤，需要class,interface或enum public class HelloWorld

1 回答HelloWorld.java:1: error: class HellWorld is public, should be declared in a file named HellWorld.java public class HellWorld{ ^ 1 error

4 回答public class HelloWorld!{ public static void main(String[] args) { System.out.println("Hello Imooc"); } }