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Why dont we explain whats the name in the code?

class MyClass { static void sayHello(String name) { System.out.println("Hello " + name); } public static void main(String[ ] args) { sayHello("David"); sayHello("Amy"); } }

9th Jan 2019, 5:53 PM
Nuh Cetin
Nuh Cetin - avatar
10 Answers
+ 1
modulo operator %: division with rest: 5/3 = 3 rest 2 4/2 = 2 rest 0 1/5 = 0 rest 1 If you want to get the rest of division you use % --> 5 % 3 = 2; 4 % 2 = 0. You need this operator to check if a number is divisble by another number. In my example I want to check if a number is even, means that the number have to be divisible by 2. (rest = 0) The method returns true if the number is even. You call the method (boolean even = isEven (4)) --> jump in the method --> return true --> leave the method Thats why its not necessary to write else return false. Make small steps. Start with a Scanner and think about your needed inputs. Users: String; price: double; product String (jpg is difficult for a beginner so do this later if you familiar enough with java --> reading a file in java? using graphics in java?) Arrays are possible or you can take a List like ArrayList. Make familiar with both and look whats better for you.
10th Jan 2019, 4:17 PM
Denise Roßberg
Denise Roßberg - avatar
+ 1
The method expects a String: String name; If you call the method, name will be initialized: sayHello ("David"): String name = "David"; I hope I have understand your question.
9th Jan 2019, 8:27 PM
Denise Roßberg
Denise Roßberg - avatar
+ 1
Inside the brackets you write what the method should expect: The first part is the type of the variable, the second part is the name of the variable For example: int age String country Long number ... If the method do not need anything you write nothing inside the brackets.
9th Jan 2019, 8:44 PM
Denise Roßberg
Denise Roßberg - avatar
+ 1
Static void sayHello (){ System.out.println ("Hello") } Static void squareNum (int x){ System.out.println (x*x); } public static void main (String [] args){ sayHello (); int number = 4; squareNum (number); squareNum (12); }
9th Jan 2019, 8:52 PM
Denise Roßberg
Denise Roßberg - avatar
+ 1
sayHello or squareNum is the name of the method. Normally you choose a name that explain what the method is doing. System.out.println is a method and you know that is printing something. void means that the method don't return a value. You can not write String x = sayHello (); Or int x = squareNum (4); Read more about methods in the sololearn lessons then you will see the difference.
9th Jan 2019, 9:45 PM
Denise Roßberg
Denise Roßberg - avatar
+ 1
ok ok i got it this static void sayHello(String name) { System.out.println("Hello" + name) does the trick this return thing is confusing do
9th Jan 2019, 10:54 PM
Nuh Cetin
Nuh Cetin - avatar
+ 1
For short: Public static int sum (int a, int b){ return a + b; } int number = sum (4,5); This method take two int and return the sum (also an int) public static boolean isEven (int number){ if (number % 2 == 0){ return true; } return false; } boolean even = isEven (4); take a number; return a boolean
9th Jan 2019, 11:08 PM
Denise Roßberg
Denise Roßberg - avatar
0
so the " ( ) " stands for string and whats in it is name
9th Jan 2019, 8:30 PM
Nuh Cetin
Nuh Cetin - avatar
0
Bro but the method isnt sayHello or aquareNum right... this is what we make up right? the method here in the code is void right?
9th Jan 2019, 9:24 PM
Nuh Cetin
Nuh Cetin - avatar
0
that boolean part is difficult.. because ure not using the Else so how does system know when to use treu or false damn i got to learn also about this modulo thing because % doesnt stand for percentage but for remembering if I understanded it right. how does the coding work if you want to have users that can ad products with jpg price etc is this more focussing on arrays and scanner? I know i have a long road untill i got this
9th Jan 2019, 11:23 PM
Nuh Cetin
Nuh Cetin - avatar