IKG2I4 / Software Project I

Transkripsi

1 IKG2I4 / Software Project I Mahmud Imrona, M.T. Izzatul Ummah, M.T. Kelompok Keahlian Algoritma dan Komputasi LECTURE NOTE WEEK 7 1 3/11/2015

2 WEEK 7 Java Library, JAVA API DOCS (java.lang, java.util, Java Collection) Java IO Stream & File IO Materi pendukung lainnya: Wrapper, Type Casting, Package, JAR, JAVADOC 2 3/11/2015

3 JAVA LIBRARY Beberapa library utama: java.lang: Math (misalnya Math.PI, Math.SQRT) java.io: Input/Output java.util: Collection (struktur data yang sudah tersedia) Javax.swing: untuk membuat GUI Swing Javax.sql: untuk koneksi dan query ke database 3 3/11/2015

4 MATH Contoh penggunaan Library Math: public static void main(string args[]) { System.out.println("E = " + Math.E); System.out.println("PI = " + Math.PI); double pi = Math.PI; System.out.println("sin 90 = " + Math.sin(pi/2)); System.out.println("cos 90 = " + Math.cos(pi/2)); System.out.println("tan 90 = " + Math.tan(pi/2)); System.out.println("Konversi dari degree ke radian...90 deg = " + Math.toRadians(90) + " rad."); System.out.println("Konversi dari radian ke degree...pi/2 rad = " + Math.toDegrees(pi/2) + " deg."); System.out.println("10 log = " + Math.log10(10000)); 4 3/11/2015

5 MATH Contoh penggunaan Library Math: int x = 800; int y = 50; System.out.println("max(x,y) = " + Math.max(x,y)); System.out.println("min(x,y) = " + Math.min(x,y)); double z = 5.6; System.out.println("Pembulatan (round) dari z = " + Math.round(z)); System.out.println("Membangkitkan bilangan random antara 0 dan 1 = " + Math.random()); 5 3/11/2015

6 JAVA DATE import java.util.date; class CobaDate { public static void main(string args[]) { System.out.println("Latihan menggunakan library class Date!"); Date tgl = new Date(2012,12,24); Date tgl2 = new Date(2013,1,10); System.out.println("Apakah tgl sebelum tgl2? " + tgl.before(tgl2)); System.out.println("Apakah tgl setelah tgl2? " + tgl.after(tgl2)); System.out.println("Selisih tgl dan tgl2 = " + tgl.compareto(tgl2)); System.out.println("Apakah tgl = tgl2? " + tgl.equals(tgl2)); 6 3/11/2015

7 RANDOM NUMBER GENERATOR import java.util.random; class CobaRandom { public static void main(string args[]) { Random r = new Random(); System.out.println(r.nextInt()); System.out.println(r.nextInt(15000)); System.out.println(r.nextLong()); System.out.println(r.nextDouble()); System.out.println(r.nextFloat()); System.out.println(r.nextBoolean()); 7 3/11/2015

8 COLLECTION Collection adalah struktur data yang sudah disediakan oleh Java meliputi stack, queue, linkedlist, vector, dsb. Ada tiga jenis Collection: Ordered List Dictionaries Set 8 3/11/2015

9 COLLECTION Karena array yg biasa kita pakai masih statis, harus dialokasi size-nya di awal: String[] arrstring = new String[50] Mahasiswa[] arrmhs = new Mahasiswa[50] Collection adalah penampung (array) yang bersifat dinamis Size-nya bisa mengembang/menyusut otomatis tergantung pemakaian saat runtime 9 3/11/2015

10 COLLECTION: ARRAYLIST Contoh ArrayList: ArrayList<String> arrlistmhs = new ArrayList<String>(20); // initial capacity 20 (bila tidak diisi, defaultnya 10) arrlistmhs.add("naruto"); arrlistmhs.add("sakura"); arrlistmhs.add("sasuke"); 10 3/11/2015

11 COLLECTION: VECTOR Contoh Vector: Vector<String> vectormhs = new Vector<String>(20); // initial capacity 20 (bila tidak diisi, defaultnya 10) vectormhs.add("naruto"); vectormhs.add("sakura"); vectormhs.add("sasuke"); 11 3/11/2015

12 COLLECTION: LINKEDLIST Contoh LinkedList: LinkedList<String> listmhs = new LinkedList<String>(); listmhs.addfirst("1-naruto"); listmhs.addlast("2-sakura"); listmhs.addfirst("3-sasuke"); listmhs.addfirst("4-doraemon"); listmhs.addlast("5-nobita"); 12 3/11/2015

13 COLLECTION: STACK Contoh Stack: Stack<String> stackmhs = new Stack<String>(); stackmhs.push("1-naruto"); stackmhs.push("2-sakura"); stackmhs.push("3-sasuke"); 13 3/11/2015

14 COLLECTION: PRIORITYQUEUE Contoh PriorityQueue: PriorityQueue<String> queuemhs = new PriorityQueue<String>(); queuemhs.add("1-naruto"); queuemhs.add("2-sakura"); queuemhs.add("3-sasuke"); queuemhs.add("4-doraemon"); queuemhs.add("5-nobita"); 14 3/11/2015

15 COLLECTION: HASHMAP Contoh HashMap: HashMap<Integer,String> hmapmhs = new HashMap<Integer,String>(20); // initial capacity 20 (bila tidak diisi, defaultnya 10) hmapmhs.put(118,"naruto"); hmapmhs.put(119,"sakura"); hmapmhs.put(120,"sasuke"); 15 3/11/2015

16 COLLECTION: HASHSET Contoh HashSet: HashSet<String> hsetmhs = new HashSet<String>(20); // initial capacity 20 (bila tidak diisi, defaultnya 10) hsetmhs.add("naruto"); hsetmhs.add("sakura"); hsetmhs.add("sasuke"); 16 3/11/2015

17 JAVA IO STREAM & FILE IO Java menyediakan cara muda untuk: Menampilkan (OUTPUT) sesuatu ke layar Java menyediakan banyak cara untuk: Menerima masukan (INPUT) dari keyboard Membaca file (READ) Menulis file (WRITE) 17 3/11/2015

18 JAVA IO STREAM import java.util.scanner; //utility class Driver { public static void main(string[] args) { Scanner objscanner = new Scanner(System.in); String nama,alamat; int umur; float x; System.out.print("Anjeun saha namina? "); nama = objscanner.nextline(); // meminta masukan dari keyboard System.out.print("Umur berapa? "); umur = objscanner.nextint(); // meminta masukan dari keyboard 18 3/11/2015

19 JAVA IO STREAM System.out.print("Masukkan angka float "); x = objscanner.nextfloat(); // meminta masukan dari keyboard System.out.println("Halo "+nama); System.out.println("Umur "+umur+" tahun!"); System.out.println("Angka yang Anda masukkan = "+x); 19 3/11/2015

20 FILE IO: READ class Driver { public static void main(string[] args) { try { FileReader fr = new FileReader("bacajava.txt"); BufferedReader br = new BufferedReader(fr); String baca = br.readline(); System.out.println(baca); baca = br.readline(); System.out.println(baca); baca = br.readline(); System.out.println(baca); br.close(); catch (FileNotFoundException fnfe) { catch (IOException ioe) { 20 3/11/2015

21 FILE IO: READ class Driver { public static void main(string[] args) { try { byte[] arrbyte = new byte[10]; FileInputStream fis = new FileInputStream("bacajava.txt"); fis.read(arrbyte,0,10); String baca = new String(arrByte); System.out.println(baca); catch (IOException ioe) { 21 3/11/2015

22 FILE IO: WRITE class Driver { public static void main(string[] args) { try { // ciptakan dulu filenya secara fisik FileOutputStream fos = new FileOutputStream("tulisjava.txt"); byte[] arrbyte = Latihan menulis ke file".getbytes(); fos.write(arrbyte); catch (FileNotFoundException fnfe) { catch (IOException ioe) { 22 3/11/2015

23 FILE IO: WRITE class Driver { public static void main(string[] args) { try { FileOutputStream fos = new FileOutputStream("tulisjava.txt"); BufferedOutputStream bos = new BufferedOutputStream(fos); byte[] arrbyte = "Mau nulis ke file nih".getbytes(); bos.write(arrbyte); bos.close(); catch (FileNotFoundException fnfe) { catch (IOException ioe) { 23 3/11/2015

24 FILE IO: WRITE class Driver { public static void main(string[] args) { try { FileOutputStream fos = new FileOutputStream("tulisjava.txt"); PrintWriter pw = new PrintWriter(fos); pw.println("practice makes perfect!"); pw.println("no pain no gain!"); pw.println("berdoa dan berusaha!"); pw.println("fight for your dream and make it true!"); pw.close(); catch (FileNotFoundException fnfe) { catch (IOException ioe){ 24 3/11/2015

25 THANK YOU