Acad uses Java 15

Make sure your version is close. 
- If you get a 'major/minor' error compiling, you need a newer version
  * The error is a result of a .class file with content newer than the interpreter.

A Java program may be runnable without explicit compilation

Println Quirk
- Println allows type coercion, e.g. println(""+23+34); will definitely print 2334
  * The first item being a string forces corcion of the rest.
  * However, println(23+34) may print 57 (I'm not sure)
  * println((23+34)) will print 57

Java does not equate int and char like C++.

System.in is Java's stdin
System.out is Java's stdout.

toString() in the Object class can be used to control what is written if an object is println'd.
- the default action is to write the type name, an @, and the object's address.
- Closest thing to implementing << operator.

The Java command line argument vector of strings does not include the executable name.

Use parseInt() to convert sString to int. Much less typing:

public static int readInt() throws java.io.IOException
 {BufferedReader DataIn = new BufferedReader(new InputStreamReader(System.in));
  String Input=DataIn.readLine();
//  return (Integer.valueOf(Input).intValue());
  return (Integer.parseInt(Input));
 }

} // end of ReadInput Class

The Java compiler uses the classpath to search for classes referred to in applications (written in Java).

On acad, the .bash_profile in your root is read on login. This is how your preferred environment is established.

Java Packages
- Packages allow us to create libraries of whatever.
- The top level of a package MUST be in a directory that is in the classpath.
- Every item but the last in an import statement is the name of a package.
  * The last item is the name of a class in the package
- An import string's content is mandated by the directory structure.
- A package statement must have a path, . separated, from a directory in the classpath.

Project 1
Objectives
- Preliminary back end work for the term project
- Get everyone to the somewhat same place with java.

Acad web area
- By Sunday at 6 PM, check if you have a web area on acad. It is a public_html directory under the root.

Javadoc demos are under 421 directories on acad and the web.