java course

This code is made for people who want to learn java.

printing in java
to print or output text/number in java use this syntax

System.out.println("hello");

This will output hello
#important:s of system is capital
#dont forget to add ; this semicolon to the end of the line

where to write a java code
when you open java in code playground you will see this

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

code in here

} }

storing things
in order to store things as variables in java first you need to specify what are you storing in it

for eg:

if you are storing a string(a bunch of words/letter) first type String
remember strings s is capial/uppercased
code for storing a string

String name="jhonny";

for storing an integer(int's i is not capitalized)

int age=54;

for storing a float/double(doubles's d is not capitalized)

double pi=3.14159;

getting user input
inorder to get user input first on top of the java code you have to write this

import java.util.Scanner;

this code helps to import an object called scanner
scanner helps to get user input
here is an example how to import it

import java.util.Scanner

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

} }

but we have to activate it so we code this inside the brackets

Scanner scan=new Scanner(System.in);

use capital letters wherever i used capital
now Scanner is stored inside scan when you are write your code you can use any other name instead of scan ok

next we are at final stage now if you wanna store the string or number user enters code this

String name=scan.nextLine();

if its a number :

int num=scan.nextInt();

we use scan because thats where Scanner is stored in and. lets you acsses the functions inside scanner

name printing code
this code will ask you your name then it prints it

import java.util.Scanner

public class Program {
public static void main(String[] args) {
Scanner scan=new Scanner(system.in); String name=scan.nextLine();
System.out.println(name);
} }

lesson 2 will be out soon