JavaDataTypes.java

// Primitive types:

// int for integer number: -2, -1, 0, 1, 2
int n = 5;
// double for decimal numbers: 2.0, -1.3, .23
double pi = 3.14;
// boolean: true or false values
boolean isHappy = true;
// char for single characters: c, a, q, 1, !, $, \n
char c = 'g';

// Reference types:
// These are objects and can be null

// String for text:
String line = "Hi my name is Jeff.";
// Other objects like arrays, ArrayList, or self created like Dog