Java Class 2 & 5

By: Brooke Simspon and Jackson Suggs

Class 2

Creating a Java Project

  • Start Netbeans
  • Go to file
  • Click on Project Group
  • Hit new group
  • Assign a name
  • Now create a new project
  • Choose a project type
  • Assign it a name

New Projects

New projects start with information added by default. Although it's useful because it gives a basic structure it needs to be changed unless you want your first comment to be, "To change this license header, choose License Headers in Project Properties."

Comments

  • A comment begins with */
  • It ends with /*
  • A comment provides some general information, generally about the program
  • Program headers are comments at the beginning of a program
  • Program headers are used to give users a little info about the program

Methods

  • A method is where a Java program performs a task.
  • The main method is the central command of the program
  • Methods can command lines to be displayed or die to be rolled

some java basics

  • With Java you have to be specific, commands with the same meaning won't give the same results.
  • Upper and lower case letters make a difference
  • Java ignores white space (blanks)
  • White spaces can in fact be used to make code easier to read while not changing the process
  • Curly braces are used for grouping, and mark the beginning and end of programming sessions
  • A wall of code is called a block
  • Indent code within a block for easier reading
  • A semicolon ends a statement
  • A statement is a program that generates an action

How java runs

Java program -> Java Compiler -> Java object code
(.java file)_________________________ (.class file)

Java object code -> Java Virtual Machine -> Java Program on your computer
(.class file)_________________________________ (Java interpreter)

File Types

  • Only .java and .class files are true java files
  • Other files may be present in your java folder, however these are particular to your medium (in this case Netbeans)

Class 5

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