CL for Java

mkdir -p src build/classes
# program name(included package): com.happysuo.test.Test.java
cd src; mkdir -p com/happysuo/test
# save .java file to com/happysuo/test folder
javac -sourcepath src -d build/classes src/com/happysuo/test/Test.java
java -cp build.classes com.happysuo.test.Test

package com.happysuo.test;

import java.util.*;

public class Test {
    public static void main(String[] args) {
        System.out.println("This is Test.java");
    } 
}