javac class issue can't run "hello world" JDK 8

[insert.memories.here]

I'm in a tough spot trying to learn how to run java in ubuntu while knowing nothing about linux. I'm wrangling with two languages at once.

So when I'm trying to compile my .java file into class, this shows up. (What does this mean?)

~/myProject$ javac Hello.java
Hello.java:5: error: cannot find symbol
            System.out.printIn("Hello World, from Ubuntu");
                      ^
  symbol:   method printIn(String)
  location: variable out of type PrintStream
1 error

...here's another try...

~/myProject$ javac Hello
error: Class names, 'Hello', are only accepted if annotation processing is explicitly requested
1 error

Here's my java file: Hello.java

public class Hello
{
        public static void main(String args[])
        {
            System.out.printIn("Hello World, from Ubuntu");
        }
}

and finally, when I try to run it...

~/myProject$ java Hello
Error: Could not find or load main class Hello
Caused by: java.lang.ClassNotFoundException: Hello

I'm fried.

[spjackson]

There is no printIn method. I think you meant println. The error when you try to run it is to be expected; you cannot run something that you have failed to compile.

[insert.memories.here]

What character is that specifically? Is that a #1?

public class Hello
{
        public static void main(String args[])
        {
            System.out.print1n("Hello World, from Ubuntu");
        }
}

Result:

~/myProject$ javac Hello.java
Hello.java:5: error: cannot find symbol
            System.out.print1n("Hello World, from Ubuntu");
                      ^
  symbol:   method print1n(String)
  location: variable out of type PrintStream
1 error

...or is that a lowercase l as in "larry"?

public class Hello
{
        public static void main(String args[])
        {
            System.out.println("Hello World, from Ubuntu");
        }
}

Result:

~/myProject$ javac Hello.java
Hello.java:1: error: error while writing Hello: /home/doughnuts/myProject/Hello.class
public class Hello
       ^
1 error

At least I didn't do anything in the terminal badly...
I just want to test my jdk installation to see if it installed properly, before actually learning java. I haven't really ran through the coding of hello world yet so I'm pretty sure something is badly written.

[spjackson]

...or is that a lowercase l as in "larry"?

Yes.

public class Hello
{
        public static void main(String args[])
        {
            System.out.println("Hello World, from Ubuntu");
        }
}

Result:

~/myProject$ javac Hello.java
Hello.java:1: error: error while writing Hello: /home/doughnuts/myProject/Hello.class
public class Hello
       ^
1 error

I can't see anything wrong with that. It's perfectly correct java that compiles and runs for me when copied & pasted from above.

You can get a similar error if file permissions prevent you writing the output:

Hello.java:1: error: error while writing Hello: Hello.class (Permission denied)
public class Hello
       ^
1 error

but then it explicitly says "(Permission denied)". So I don't know why you are getting that output, I'm afraid.