java_notes.txt

Only including differences from C++

BASICS
Everything must be in a class
Class contains main function

I/O
System.out.println("Tyler")

Classes
class MyClass {
    public myClass() { //Constructor
    
    }
    
    public static void main(String[] args) {
        myClass instance = new myClass();
    }
    
    int myInt //Data member (instance variable)
}

class MyChild extends MyClass {} //Inheritance

Data Structures
import java.util.ArrayList
ArrayList<Integer> myList = new ArrayList<Integer>() //Must use wrapped type, Integer instead of int
myList.add(value)
myList.get(index)
myList.add(index, value)
myList.size()

HashMap<String, Integer> myFriends = new HashMap<String, Integer>()
myFriends.put("Mark", 24)
myFriends.get("Mark") //Returns value associated with the specified key
myFriends.keySet() //Returns a list of the keys

Loops
for (Integer grade : quizGrades) //For each element in quizGrades, represented by grade

static
public