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Java程序运行报错，提示"必须声明一个命名包"，用的是eclipse的JavaSE-15，...
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Java程序运行报错，提示"必须声明一个命名包"，用的是eclipse的JavaSE-15，不胜感激！
各位大侠好，新开始Java编程，第一个程序提示在开头和最后分别有入下提示：
Must declare a named package because this compilation unit is associated to the
named module 'DEmo_01'
Syntax error, insert "}" to complete ClassBody
能提示一下我怎么改吗，用的是eclipse的JavaSE-15，不胜感激！
public class HelloWorld {
public static void main(String[] args){
System.out.println("Hello World!");
}
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