Bab 6 ~ Package dan Java Kelas

1.      Membuat Package

Buat lah terlebih dahulu direktori  makhlukhidup\hewan

Manusia.java

package makhlukhidup;

public class Manusia {

            public String nama = "";

            public Manusia (String nama){

                        this.nama = nama;

            }

}

Tumbuhan.java

package makhlukhidup;

public class Tumbuhan {

            public String nama ="";

            public Tumbuhan (String nama){

                        this.nama = nama;

            }

}

Burung.java

package makhlukhidup.hewan;

public class Burung{

            public static final boolean bisaTerbang = true;

            public String nama ="";

            public Burung (String nama){

                        this.nama = nama ;

                        System.out.println (" Nama Burung : "+nama);

            }

}

MainMakhlukHidup.java

public class MainMakhlukHidup {

public static void main (String [] args){

            makhlukhidup.Manusia m = new makhlukhidup.Manusia ("Sayuti");

            System.out.println ("Nama : " +m.nama);

            makhlukhidup.Tumbuhan t = new makhlukhidup.Tumbuhan ("Palem");

            System.out.println ("Nama : "+t.nama);

            System.out.println ("Semua burung pasti bisa terbang ? " +makhlukhidup.hewan.Burung.bisaTerbang);

            makhlukhidup.hewan.Burung b = new makhlukhidup.hewan.Burung ("Beo");

}

}

MainMakhlukHidupPakeImport.java

import makhlukhidup.*;

import makhlukhidup.hewan.*;

public class MainMakhlukHidupPakeImport {

            public static void main (String [] args){

                        Manusia m= new Manusia ("Sayuti");

                        System.out.println ("Nama = "+m.nama);

                        Tumbuhan t = new Tumbuhan ("Palem");

                        System.out.println ("Nama = "+t.nama);

                        System.out.println ("Semua burung bisa terbang ? "+Burung.bisaTerbang);

                        Burung b = new Burung ("Beo");

            }

}

2.      Membuat program contoh String.java

public class ContohString {

            public static void main (String[]args){

                        String Kalimat = "Selamat belajar JAVA";

                        System.out.println ("toUpperCase " +Kalimat.toUpperCase());

                        System.out.println ("toLowerCase " +Kalimat.toLowerCase());

                        System.out.println ("Jumlah Karakter : " +Kalimat.length());

                        System.out.println ("Karakter Index ke 0 : " +Kalimat.charAt(0));

                        System.out.println ("SubString (16,20) : " +Kalimat.substring(16,20));

                        System.out.println ("Karakter Index ke 0 ; " +Kalimat.trim());

            }

}

3.      Membuat program OPMatematika.java

public class OpMatematika {

            public static void main (String[]args){

                        System.out.println ("E                                      = " +Math.E);

                        System.out.println ("PI                                     = " +Math.PI);

                        System.out.println ("Ln 20                               = " +Math.log(20.0));

                        System.out.println ("ceil(-5.6)              = " +Math.ceil(-5.6));

                        System.out.println ("floor(-5.6)            = " +Math.floor(-5.6));

                        System.out.println ("round (-5.6)         = " +Math.round(-5.6));

                        System.out.println ("sqrt (25)               = " +Math.sqrt(25));

                        System.out.println ("pow (25,0.5)        = " +Math.pow(25,0.5));

            }

}