Compile and Run Multiple Java Classes From Command Prompt.

It sounds silly to write a post for java file compilation and execution. But I took one hour to find the problem.

If you have multiple java files and all of them are in different packages. Then how can you compile them and run main class among them. Let me take an example
Consider two classes in a package com.test.
com.test.MainClass
com.test.UtilityClass


Compilation: If you go inside and compile using javac mainclass, you will be thrown an error

MainClass : Cannot find location

Similarly if you have class files in a package and if you try to execute,using java mainclass command, then system will throw following error.

Exception in thread "main" java.lang.NoClassDefFoundError: <ClassName> (wrong nam
e: com/test/<ClassName>)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

Problem here is we go inside the folder com/test and try to compile or run files. But
Never go inside packaged folder(com or test) and try to run the files. 
Come out of the package folder and run the commands. 
Compilation: 
javac ./com/test/MainClass.java
javac ./com/test/Utilities.java

Execution:
java com.test.MainClass.java