BOOK

Pengenalan Pemrograman Java

pada awalnya akan kita lihat program Java pertama yang akan anda tulis.


Percobaan 1 HelloWorld :.

public class Hello { /** * My first java program */ public static void main(String[] args) { //Menampilkan kata "Hello world" dilayar System.out.println("Hello world!"); } }

Percobaan 1 Menampilkan Data Variabel :.

public class OutputVariable { public static void main( String[] args ){ int value = 10; char x; x = 'A'; System.out.println( value ); System.out.println("The value of x=" + x ); } }

Percobaan 2 Penggunaan Operator Aritmatika :

public class aritmatikaDemo { public static void main(String[] args) { //sedikit angka int i = 37; int j = 42; double x = 27.475; double y = 7.22; System.out.println("Variable values..."); System.out.println(" i = " + i); System.out.println(" j = " + j); System.out.println(" x = " + x); System.out.println(" y = " + y); //penjumlahan angka System.out.println("Adding..."); System.out.println(" i + j = " + (i + j)); System.out.println(" x + y = " + (x + y)); //pengurangan angka System.out.println("Subtracting..."); System.out.println(" i - j = " + (i - j)); System.out.println(" x - y = " + (x - y)); //perkalian angka System.out.println("Multiplying..."); System.out.println(" i * j = " + (i * j)); System.out.println(" x * y = " + (x * y)); //pembagian angka System.out.println("Dividing..."); System.out.println(" i / j = " + (i / j)); System.out.println(" x / y = " + (x / y)); //menghitung hasil modulus dari pembagian System.out.println("Computing the remainder..."); System.out.println(" i % j = " + (i % j)); System.out.println(" x % y = " + (x % y)); //tipe penggabungan System.out.println("Mixing tipes..."); System.out.println(" j + y = " + (j + y)); System.out.println(" i * x = " + (i * x)); } }

Percobaan 3 Penggunaan Operator Relasi:

public class RelasiDemo { public static void main(String[] args) { //beberapa nilai int i = 37; int j = 42; int k = 42; System.out.println("Nilai variabel..."); System.out.println(" i = " + i); System.out.println(" j = " + j); System.out.println(" k = " + k); System.out.println("Lebih besar dari..."); //lebih besar dari System.out.println(" i > j = " + (i > j)); //false System.out.println(" j > i = " + (j > i)); //true System.out.println(" k > j = " + (k > j)); //false System.out.println("Lebih besar dari atau sama dengan..."); //lebih besar atau sama dengan System.out.println(" i >= j = " + (i >= j)); //false System.out.println(" j >= i = " + (j >= i)); //true System.out.println(" k >= j = " + (k >= j)); //true System.out.println("Lebih kecil dari..."); //lebih kecil dari System.out.println(" i < j = " + (i < j)); //true System.out.println(" j < i = " + (j < i)); //false System.out.println(" k < j = " + (k < j)); //false System.out.println("Lebih kecil dari atau sama dengan..."); //lebih kecil atau sama dengan System.out.println(" i <= j = " + (i <= j)); //true System.out.println(" j <= i = " + (j <= i)); //false System.out.println(" k <= j = " + (k <= j)); //true System.out.println("Sama dengan..."); //sama dengan System.out.println(" i == j = " + (i == j)); //false System.out.println(" k == j = " + (k == j)); //true System.out.println("Tidak sama dengan..."); //tidak sama dengan System.out.println(" i != j = " + (i != j)); //true System.out.println(" k != j = " + (k != j)); //false } }

Percobaan 4 Penggunaan Operator Logika dan Boolean AND:

public class TestAND { public static void main( String[] args ){ int i = 0; int j = 10; boolean test= false; //demonstrasi && test = (i > 10) && (j++ > 9); System.out.println(i); System.out.println(j); System.out.println(test); //demonstrasi & test = (i > 10) & (j++ > 9); System.out.println(i); System.out.println(j); System.out.println(test); } }

Percobaan 5 Penggunaan Operator Logika dan Boolean OR:

public class TestOR { public static void main( String[] args ){ int i = 0; int j = 10; boolean test = false; //demonstrasi || test = (i < 10) || (j++ > 9); System.out.println(i); System.out.println(j); System.out.println(test); //demonstrasi | test = (i < 10) | (j++ > 9); System.out.println(i); System.out.println(j); System.out.println(test); } }

Percobaan 6 Penggunaan Operator Logika Eksklusive OR:

public class TestXOR { public static void main( String[] args ){ boolean val1 = true; boolean val2 = true; System.out.println(val1 ^ val2); val1 = false; val2 = true; System.out.println(val1 ^ val2); val1 = false; val2 = false; System.out.println(val1 ^ val2); val1 = true; val2 = false; System.out.println(val1 ^ val2); } }

Percobaan 7 Penggunaan Operator Logika NOT:

public class TestNOT { public static void main( String[] args ){ boolean val1 = true; boolean val2 = false; System.out.println(!val1); System.out.println(!val2); } }

Percobaan 8 Penggunaan Operator Kondisi (?:):

Contoh 1 :

public class kondisiOperator { public static void main( String[] args ){ String status = ""; int grade = 80; //mendapatkan status pelajar status = (grade >= 60)?"Passed":"Fail"; //print status System.out.println( status ); } }

Contoh 2 :

class kondisiOperator { public static void main( String[] args ){ int score = 0; char answer = 'a'; score = (answer == 'a') ? 10 : 0; System.out.println("Score = " + score ); } }