Created
August 13, 2019 15:38
-
-
Save MelulekiDube/393c78a05078011c244d6a1239ea4e81 to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import java.util.Scanner;/*Always assume you will need this*/ | |
public class Test1A /*Always create class with the file name*/{ | |
public static void main( String[] arg){ | |
/*Get rid of the scanner*/ | |
Scanner sc = new Scanner(System.in); | |
/*start doing some work here | |
variable delcation follows here: | |
How to declare primitive which include int double float char boolean (these are not going to create objects): | |
type var_name; {type is in {int float double char boolean}} | |
type var_name = value; for delcaring and assigning | |
To assigning | |
var_name = value; | |
How to declare objects: | |
First you need to know the class names | |
Class_Name var_name; //var_name does not have a value | |
Assign value: | |
var_name = value; if value has been created before | |
otherwise: | |
var_name = new Class_Name(constructor parameters); | |
Accessing object methods and variables: | |
if you have the classes first check if the variable or method you are accessing is not private | |
You always need an object to access methods and variables in a class | |
lets say we have an object created as below: | |
ClassName var_name = ........; if the class has a method called public int getValue(){......return ...;} | |
then we can access getValue as: | |
int var_name1 = var_name.getValue(); | |
the syntax will be: | |
variablename.methodname where variablename is an object and methodname is the method you want | |
always remember that if you usign a method end methodname with parenthesis () | |
if we wanted to use a called set defined as in a class called Person like below | |
public class Person{ | |
******** | |
public void set(int a){ | |
........; | |
} | |
******** | |
} | |
1) always have an object that can that method | |
Person temp = new Person(); | |
temp.set(1); | |
*/ | |
/* | |
Using if statements: | |
if (conditional statement which results in a boolean value) example if(2>3) 2>3 is a conditional statement and is either true of false | |
*/ | |
//example | |
/* | |
loops in java | |
for while do-while | |
//COPY THESES FROM YOUR NOTES | |
*/ | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment