Bab 1 ~ Dasar - Dasar Java

1.      Membuat Program HelloWorld.java

public class HelloWorld {

            public static void main (String [] args){

                        System.out.println("Hello World from Java");

            }

}

2.      Membuat Program TesTipeData.java

class TesTipeData {

public static void main (String[]args){

byte b =1;

short s = 100;

int i = 1000;

long l = 10000;

char c = 'a';

float f =3.14f;

double d = 3.14;

boolean t = true;

final double PI =3.14;

System.out.println("byte " +b);

System.out.println("short " +s);

System.out.println("int " +i);

i = 010;

System.out.println("int " +i+ "octal mode");

i = 0xff;

System.out.println("int " +i+ "hexa mode");

System.out.println("long " +l);

System.out.println("char " +c);

System.out.println("float " +f);

System.out.println("double " +d);

System.out.println("boolean " +t);

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

}

}

3.      Membuat Program TesKeputusan.java

class TesKeputusan {

            public static void main (String[] args){

                        char jeniskelamin = 'W';

                        //nested if

                        if (jeniskelamin == 'L')

                                    System.out.println("Cowok");

                        else if (jeniskelamin == 'P')

                                    System.out.println("Cewek");

                        else

                                    System.out.println("Banci");

                       

                        //ternary

                        System.out.println(jeniskelamin=='P' ? "Dia pasti cowok" : "Dia Pasti Cewek");

                       

                        //switch case

                        switch (jeniskelamin) {

                                    case 'P' : System.out.println("Cowok");

                                                break;

                                    case 'L' : System.out.println("Cewek");

                                                break;

                                    default             : System.out.println("Banci");

                                                break;

                                    }

                        }

            }

4.      Membuat Program TesPerulangan.java

public class TesPerulangan {

            public static void main (String[] args){

                        int i;

                        //for

                        System.out.println("Perulangan For...");

                        for (i=0; i<10; i++)

                                    System.out.println("Perulangan ke : "+i);

                        //while

                        System.out.println("Perulangan While...");

                        i=0;

                        while (i<10) {

                                    System.out.println("Perulangan Ke : "+i);

                                    i++;

                        }

                        //do while

                        System.out.println("Perulangan Do While...");

                        i=0;

                        do {

                                    System.out.println("Perulangan Ke : "+i);

                                    i++;

                                    }

                        while (i<10);

            }

}