Compile java in ubunt for help

For details about java compilation under ubunt, refer to general Linux technology-Linux technology and application information. [I = s] This post was last edited by newhope1106

The following is a program named test. java that I tested and wrote. However, some problems have occurred. Please help solve the problem.

Public class Helloworld
{
Public static void main (String args [])
{
System. out. println ("Hello, world ");
}
}


Enter javac test. java in the terminal
Result output: test. java: test. java: 3: The Helloworld class is public. It should be declared in the file Helloworld. java.
Public class Helloworld
^
1 error



What is the cause and how to solve it.