cast

double price = 4.35
int pennies = (int)(4.35 * 100);

turn Gray

    public void turnGray()
    {
        int gray = 0.2126 * red + 0.7152 * green + 0.0722 * blue;
    }

Math.pow(10, 3)
Math.sqrt(4)
Math.abs(3- 5)
Math.min(300, 255)
Math.max(0, -1)

math function

red = Math.min(255, red + 25);

import java.util.Scanner;

public class InputDemo
{
	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);
		System.out.print("How old ar you? ");
		int age = in.nextInt();

		System.out.print("Next year, you will be ");
		System.out.println(age + 1);

		System.out.print("What is your weight? ");
		double.weight = in.nextDouble();

		System.out.print("I hope next year that'll be ");
		System.out.print(weight * 0.95);
	}
}

int cookiesPerDay;
double cerealBoxesPerDay;
String name;
System.out.printf("%6d", cookiesPerDay);
System.out.printf("%4.2f", cerealBoxesPerDay);
System.out.printf("%s", name);

String name = "whitehouse";

name.length()
name.substring(3, 7)
name.indexOf("c")
"Hello" + name

secret government elevator

import java.util.Scanner;

public class ElevatorDemo
{
    public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Floor: ");
        int floor = in.nextInt();
        int actualFloor;

        if (floor > 14)
        {
            actualFloor = floor - 2;
        }
        else
        {
            actualFloor = floor;
        }
        System.out.println("Actual floor: " + actualFloor);
    }
}