I was trying to write a Java program with more than 1 public class and it gave me the following error:
Class [classname] is public,should be declared in a separate file named
[classname].java
Can't seem to find a convincing answer as to why this is happening.
You can not declare more than one public class in one .java file. Separate your classes to different .java files.
Class1.java
public class Class1 {
}
Class2.java
public class Class2 {
}
This restriction implies that there must be at most one such type per compilation unit. This restriction makes it easy for a compiler for the Java programming language or an implementation of the Java virtual machine to find a named class within a package; for example, the source code for a public type wet.sprocket.Toad would be found in a file Toad.java in the directory wet/sprocket, and the corresponding object code would be found in the file Toad.class in the same directory.
类名与文件名相同。如果文件中有多个类，则会产生冲突，从而导致错误。所以每个类都应该在一个单独的文件中，文件名与类名相同。
每个公共类都必须在它自己的 .java 源文件中声明。