apcsa

random int between 5 and 10, inclusive

(int)(Math.radom()*6) + 5;

formatting of random

(int)(Math.random()*range) + min
range = max-min +1

private String example;
public Object(String thingy){
??
}

example = thingy

Insertion sort

starts with first item, shifts individual items one at a time

merge sort

halves and then halves and then halves

selection sort

passes through whole thing and puts the lowest at the beginning

iteration search

loops instead of recursion

bubble sort

items 0 and 1 compare then swap, items 1 and two compare and swap… etc

For each loops

int[] nums = new int[];

normal: for(int i = 0; i < nums.length; i++){
}
for each: for(int num: nums){
}
the int before the colon is the same as i, the number after the same as whatever i is less than

nested for each loop

int[][] matrix = new int[][];
for(int row: matrix){
for(int col: row){
}
}
second nested calls the i of the first one

for each loops with arraylist

ArrayList<String> names = new ArrayList<String>();

for(String i: names){
System.out.println(i);
}
no .get and cannot change elements

for each loops with array

String[] names = new String[];
for(i: names){
System.out.println(i);
}
no [ ]

class header

public class Example{
public static void main(String[] args){

final

cannot be changed. ex: final Double pi = 3.14

instance variables/attributes

the class variables, ex:

String place();

super

calls the constructor or parametized constructor from the superclass

public PainterPlus(){
super();
}

escape sequences

\n = new line

\” = double quote

\\ = backslash

De morgans laws

the rules with || && ! with parenthesis