cs2381 Notes: 01 Welcome

Data Structures First Day:

Hello #

Hello
Data structures?
- How to structuring data
- Second semester of programming
Attendence

Syllabus #

Attendence is strongly recommended.
- Also, eating and sleeping.
Attendence for labs on Tuesdays is graded.
We’ll be treating the lecture and lab as one course, I’ll probably have to enter your grade twice at the end of the semester.
Lab projects are the largest grade component. You’ll work in pairs and write code.
Exams are on paper, and really will include writing code with a pencil.
We’ll see an autograding example tomorrow.
I think tutoring is 6-8pm Monday-Thursday in the lab, but I’m not 100% sure.
Please don’t cheat.

Introducing Java #

// Hello.java

public class Hello {
    public static void main(String[] args) {
        System.out.println("Hello");
    }
}

http://bryanchadwick.com/javaworld/index.html

https://openclipart.org/detail/175310/red-balloon

import world.*;
import image.*;

public class Launch {
    public static void main(String args[]) {
        var y0 = 0;
        var world0 = new LaunchWorld(y0);
        world0.bigBang();
    }
}

class LaunchWorld extends World {
    double yy;

    LaunchWorld(double y0) {
        this.yy = y0;
    }

    @Override
    public Scene onDraw() {
        var bg = new EmptyScene(800, 800);
        var balloon = new FromFile("./balloon.png");
        return bg.
            placeImage(balloon, 400, 800 - yy);
    }

    @Override
    public LaunchWorld onTick() {
        return new LaunchWorld(this.yy + 2);
    }
}

javac -cp .:JavaWorld.jar Launch.java
java -cp .:JavaWorld.jar Launch