drag and drop

a = Shapes.AddEllipse(100,100)
b = Shapes.AddRectangle(100,100)
GraphicsWindow.MouseMove = mousemove

Sub mousemove
  If GraphicsWindow.MouseX >= Shapes.GetLeft(b) then
    If GraphicsWindow.MouseX <= Shapes.GetLeft(b) + 100 then
      If GraphicsWindow.MouseY >= Shapes.GetTop(b) Then
        If GraphicsWindow.MouseY <= Shapes.GetTop(b) + 100 then
  While Mouse.IsLeftButtonDown
    Shapes.move(b, GraphicsWindow.MouseX - 50, GraphicsWindow.MouseY - 50)
  Endwhile
EndIf
EndIf
EndIf
endif
endsub

1. Chapter1 - Installation and setup
Java development kit = compiler, virtual machine, and codes
package = nothing but folder

Chapter2 Notes
comment
- multiline: /*
- single line: //

printing a text
System.out.println("aloha");

concantenator = +
examples:
x = 10
System.out.println("aloha" + x);

mod: %
example: 5 % 2

IF
int x = 20;
int y = 20;
if (x < y){
    System.out.println("x is less then y");
}
if (x == y){
    System.out.println("x is equal to Y");
}
if (x > y){
    System.out.println("x is bigger then y");
}

shorten that if

int x = 20;
int y = 20;
if (x < y) {
    System.out.println("x is less then y");
}
else if (x == y)
shorten again:

Symbol:
x ++ itu sama dengan x = x+1 sama dengan x+=1

Switch-case
Contoh: pemilihan menu nasi goreng berdasarkan jenis hari.
nasigoreng = hari

Java

If, if-else
for, while, do-while, for-each
arrays
string manipulation, wrapper classes
data types and operators

Chapter3
Class, object
data and methods
method signature
this keyword
constructor

Chapter4
Object oriented-programming
What makes a language OOP?
encapsulation and data hiding
getter and setter
polymorphism, overloading


Chapter 5 review

Chapter6

Inheritance
abstract classes
interfaces
super keywor
overriding

Chapter7
Collections
List, arraylist
Hashmap
Generics

Chapter 8
Exceptions
try-catch-finally
throw and throws


Chapter9
Final, static
Final keyword
Static keyword
Variable arguments

 

Drag and Drop

a = Shapes.AddEllipse(100,100)
GraphicsWindow.MouseMove = mousemove

Sub mousemove
  While Mouse.IsLeftButtonDown
    Shapes.move(a, GraphicsWindow.MouseX, GraphicsWindow.MouseY)
  Endwhile
endsub

ketika dua event berjibaku

gw pengen discover: apakah suatu eksekusi suatu event bisa di interupsi oleh eksekusi event lain?

GraphicsWindow.Show()
GraphicsWindow.MouseDown = mousedown
GraphicsWindow.KeyDown = keydown

Sub keydown
  TextWindow.WriteLine("aloha")
EndSub

Sub mousedown
  TextWindow.BackgroundColor = "red"
  For i = 0 To 100000
    TextWindow.WriteLine(i)
  EndFor
EndSub

diatas kmu bisa lihat bahwa ketika gw klik mouse diatas jendela grafik, program akan mulai menampilkan angka di jendela text (textwindow), angka ini gw perbanyak dari 0 sampai seratus ribu, untuk memperlama waktu eksekusi sub procedure mousedown. Ditengah eksekusi sub procedure mousedown ini, misalkan ketika angka baru sampai angka 10000, 10001, gw tekan sembarang tombol pada keyboard, dengan tujuan mengintrupsi proses perlakuan sub procedure mousedown diatas, tapi gw tidak melihat adanya tampilan kata aloha, yang gw lihat hanya penerusan angka-angka tersebut.

Setelah angka 100000 lah gw baru melihat kata aloha diatas. Dari pengujian ini gw bisa melihat bahwa yang pengintrupsian subprocedure tidak bisa dilakuka.

Gambar biar gw jangan dibilang hoax:

Putting a text in the middle of a rectangle's shape

graphicswindow.

Intinya: suatu shapes rectangel tidak bisa diubah caption/textnya dengan menggunakan shapes.settext