contoh codingan Java

 Bahasa pemrograman java merupakan bahasa pemrograman yang bisa kita gunakan untuk mendevelop aplikasi berbasis desktop, web, dan mobile.

Untuk mempelajari bahasa pemrograman ini kita harus menginstall JDK dan juga IDE seperti Netbeans dan Eclipse, yang nantinya digunakan untuk melakukan pengcodingan.

1. Menampilkan Hello World

public class MyClass {
public static void main(String[] args) {
System.out.println("Hello World");
}
}

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2. Variabel pada Java

public class MyClass {
public static void main(String[] args) {
int myNum;
myNum = 15;
System.out.println(myNum);
}
}

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3. Penggunaan Tipe Data pada Java

public class MyClass {
public static void main(String[] args) {
int myNum = 5;               // integer (whole number)
float myFloatNum = 5.99f;    // floating point number
char myLetter = 'D';         // character
boolean myBool = true;       // boolean
String myText = "Hello";     // String
System.out.println(myNum);
System.out.println(myFloatNum);
System.out.println(myLetter);
System.out.println(myBool);
System.out.println(myText);
}
}

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4. Operator pada Java

public class MyClass {
public static void main(String[] args) {
int sum1 = 100 + 50;
int sum2 = sum1 + 250;
int sum3 = sum2 + sum2;
System.out.println(sum1);
System.out.println(sum2);
System.out.println(sum3);
}
}

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5. Penggunaan String pada Java

public class MyClass {
public static void main(String[] args) {
String txt = "Hello World";
System.out.println(txt.toUpperCase());
System.out.println(txt.toLowerCase());
}
}

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6. IF dan Else

public class MyClass {
public static void main(String[] args) {
int time = 22;
if (time < 10) {
System.out.println("Good morning.");
} else if (time < 20) {
System.out.println("Good day.");

}  else {
System.out.println("Good evening.");
}
}
}

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7. Switch

public class MyClass {
public static void main(String[] args) {
int day = 4;
switch (day) {
case 1:
System.out.println("Monday");
break;
case 2:
System.out.println("Tuesday");
break;
case 3:
System.out.println("Wednesday");
break;
case 4:
System.out.println("Thursday");
break;
case 5:
System.out.println("Friday");
break;
case 6:
System.out.println("Saturday");
break;
case 7:
System.out.println("Sunday");
break;
}
}
}

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8. Penggunaan While

public class MyClass {
public static void main(String[] args) {
int i = 0;
while (i < 5) {
System.out.println(i);
i++;
}
}
}

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9. Penggunaan Array

public class MyClass {
public static void main(String[] args) {
String[] cars = {"Volvo", "BMW", "Ford", "Mazda"};
for (int i = 0; i < cars.length; i++) {
System.out.println(cars[i]);
}
}
}

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10. User Input

import java.util.Scanner; // import the Scanner class
class MyClass {
public static void main(String[] args) {

Scanner myObj = new Scanner(System.in);
String userName;

// Enter username and press Enter

System.out.println("Enter username");
userName = myObj.nextLine();
System.out.println("Username is: " + userName);
}
}

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