我一直都是这个问题，
HelloWorld.java:1: error: class hellowrold is public, should be declared in a file named hellowrold.java
public class hellowrold{
^
1 errorHelloWorld.java:1: error: class hellowrold is public, should be declared in a file named hellowrold.java
public class hellowrold{
^
1 error
