Topic 1.1 Why Java

System.out.print and system.out.println display information on the computer monitor
System.out.println moves the cursor to a new line after the information has been displayed while System.out print does not
A string literal is an exact sequence of characters enclosed in double quotes
3 Error Types:
Syntax/Compiler Error
Exception (ex: divide by 0)
Logic Error (ex: - instead of + when finding the sum)

public class HelloWorld {
    public static void main(String[] args) {
        System.out.print("AP ");
        System.out.print("CS ");
        System.out.print("A ");
        System.out.println("Rocks!");
        System.out.println("Hello World");

    }
}

Topic 1.2 Variables and Data Types

A type is a set of values (a domain) and a set of operations on them
Data types can be categorized as either primitive or reference
The primitive data types used in this course define the set of operations for numbers and Boolean values
Boolean: T or F, Int: whole numbers, Double: floarting-point numbers
The three primitive data types used in this course are int, double, and Boolean
Each variable has associated memory that is used to hold its value
The memory associated with a variable of a primitve type holds an actual primitve value
When a variable is declared final, its value cannot be changed once it is intialized

public class main {
    public static void main(String[] args){
        Integer intVariable = 1995;
        Double doubleVariable = 1.62;
        Boolean booleanVariable = true;
        Character charVariable = 'A';

        System.out.println(intvariable);
        System.out.println(doublevariable);
        System.out.println(booleanvariable);
        System.out.println(stringvariable);
    }
}