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CSE 142

Lecture Notes

Week 1

General

  • You write Java code as text, you then compile it into compiler instructions using a program called a compiler. When your code is compiled it turns into byte code. Then you can run the byte code using the Java Runtime Environment.

  • In this class you will be writing your Java code in an Integrated Development Environment (IDE). IDE's allow you to type your code, compile your code, and run your code.

  • Every piece of code you write needs to be inside of a class

  • A class is executable only if it has a main method

  • Commands end with semicolons

  • Escape sequences

    Escape sequence Description
    \n Newline
    \t Tab
    \" Double quote
    \\ Backslash

  • Your goal for all assignments is to reduce redundancy

  • You want main to be short, and give an good overview of what your program does

  • Java precedence

    • unary operators (+, -)
    • multiplicative operators (*, /, %)
    • additive operators (+, -)

  • Integer division: When dividing integers, all information after the decimal point is lost

  • For now, use System.out.println("text") to display text to the console

Style

  • Classes start with a capital letter, no spaces, all other words in name are also capitalized
  • Methods start with lowercase letters, no spaces, all other words in name are capitalized
  • Indentation is important, when you open a curly brace everything inside is indented

Live Coding

Together we will write a Java Program called EggStop that prints the ASCII image below. We will practicing using methods and reducing redundancy.

   _________
  /         \
 /           \
 \           /
  \_________/
 \           /
  \_________/
  +--------+
   _________
  /         \
 /           \
 |    STOP   |
 \           /
  \_________/
   
   _________
  /         \
 /           \