```java
public class Println {
int a=1;
double b=3;
// System.out.println("不是变量不是方法");//这里不能成功运行
public void haha() {
System.out.print("123");
}
}
//这里也不行,因为在方法体的外面
Error occurred during initialization of boot layer
java.lang.module.FindException: Error reading module: D:\Java\Three_fifteen1\src\Print\bin
Caused by: java.lang.module.InvalidModuleDescriptorException: Println.class found in top-level directory (unnamed package not allowed in module)
不知道怎么解决