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
public类文件名称要和类名称相同，类（class后面的名称，此为HelloWorld）
private类文件名可以和类名不同
类名要和你创建的文件包名字要相同，大小写也要注意
把helloworld改为HelloWorld，java是区分大小写的