Hi All,

I will show you on the common syntax that we have to learn in Java.

For now, just remember that every Java program has a class name which must match the filename, and that every program must contain the main() method.

Variables (String, Int, Float, Char, Boolean)

public class MyVariables {
    public static void main(String[] args){
        String name = "Shaharil";
        System.out.println(name);
        int age = 35;
        System.out.println(age);
        float money = 613.10f;
        System.out.println(money);
        char myLetter = 'S';
        System.out.println(myLetter);
        boolean myBool = true;
        System.out.println(myBool);
        String firstName = "Qaisara";
        String secondName = "Shaharil";
        String fullName = firstName + " " + secondName;
        System.out.println(fullName);

    }
}

Control_Statement ( if, if-else if, while, for)

public class Control_Statements {
    public static void main(String[] args){

 // if statement
       int x = 20;
       int y = 18;
       if(x>y){
           System.out.println("X is greater than y");
       }

 // if-else if statement
       int time = 20;
       if(time<18){
           System.out.println("Good");
       }
       else if (time == 20){
           System.out.println("Normal");
       }
       else{
           System.out.println("Bad");
       }

 // While statement
       int i = 0;
       while(i<5){
           System.out.println(i);
           i++;
       }
 // For statement
       for(int k=0; k<5;k++){
           System.out.println(k);
       }

       String[] cars = {"Volvo","BMW","Ford"};
       for(String q:cars){
           System.out.println(q);
       }
    }
}

Array_examples

public class array_examples {

    public static void main(String[] args){

        String[] cars = {"Volvo","BMW","Honda"};
        System.out.println(cars[0]);
        System.out.println(cars.length);

        for(int i= 0;i<cars.length;i++){
            System.out.println(cars[i]);
        }

        for(String q:cars){
            System.out.println(q);
        }
    }
}

Methods

A method is a block of code which only runs when it is called. You can pass data, known as parameters, into a method.

Methods are used to perform certain actions, and they are also known as functions.

Why use methods? To reuse code: define the code once, and use it many times.

public class method_examples {
        static void myMethod(){
        // static means the myMethod below to class named method_examples
        // void that means this myMethod don't have a return value.

            System.out.println("I have learned method");
        }

        static void myMethod2(String fname, int age){
            System.out.println(fname + "Shaharil" + " " + age + " " + "years old");
        }

        static int myMethod3(int x, int y){
            // this method/function will return integer value
            return x + y;
        }

        static void checkAge(int Age){
            if(Age<18){System.out.println("Access denied");}
            else{System.out.println("Access granted");}
        }

        public static void main(String[] args){
            myMethod();
            myMethod2("Qaisara" + " ", 2);
            System.out.println(myMethod3(5,3));
            checkAge(20);
        }
}