“Too many people spend money they haven’t honestly earned, to buy things they don’t want, to impress people they don’t like.”
Using Constructors & Member Function to add two numbers: Java
In this Java video tutorial we have covered both ways of adding numbers: using constructors as well as using methods.
Constructors:
Constructor name and the class name must be same.
No return type.
There are 3 types of constructors:
1. Default constructors.
2. Parameterized constructors.
3. Copy Constructors.
In this video tutorials we have shown the use of Parameterized constructors.
calc(int a, int b) { no1 = a; no2 = b; } |
Adding and displaying the result:
public void sum() { System.out.println("Sum of "+no1+" and "+no2+" is "+(no1+no2)); } |
Strings are written inside double quotes and the variables written outside the double quotes will display the value stored in them.
+ (plus) is concatenation operation.
(no1+no2) adds the value present in no1 and no2 and displays the result of addition.
Video Tutorial
[youtube https://www.youtube.com/watch?v=gUXq1psurdk]
Object Creation:
/* calc c; // object declaration. It will have null in it. c = new calc(20,10); // Construction call */ calc c = new calc(30, 10); |
Full Java code: Using Constructors & Member Function to add two numbers(add.java)
import java.lang.*; class calc { int no1, no2; calc(int a, int b) { no1 = a; // 30 no2 = b; // 10 } /* public void assign(int a, int b) { no1 = a; // 30 no2 = b; // 10 } */ public void sum() { System.out.println("Sum of "+no1+" and "+no2+" is "+(no1+no2)); } } class add { public static void main(String args[]) { /* calc c; // object declaration. It will have null in it. c = new calc(20,10); // Construction call */ calc c = new calc(30, 10); //c.assign(30,10); c.sum(); } } |
Member functions are called with the help of object.
Syntax:
object.memberfuntion();
First Java Program: Basic
This Java tutorial will illustrate the basics of all java programs.
class Welcome
Class is a keyword. Welcome is an identifier or name of the class.
Class Welcome is declaration of class.
class Welcome { }
Every class definition in Java begins with an opening brace and ends with a matching closing brace. Note that there is no ending semicolon in Java unlike in C++.
public static void main(String args[]) { System.out.println("Welcome To Java!"); }
main() is the starting point for the interpreter to begin execution of the program. A java application can have any number of classes but only one of them must include a main method.
void: since main does not return any value;
static: Java is a pure object oriented programming language and hence even main is written inside of a class. main() belongs to the entire class and not a part of any objects of the class, so main is declared as static.
public: methods with public access specification can be accessed even outside the class.
String: is a built-in class, present inside java.lang package.
args[] : is a array variable, used to get the arguments from the user.
System.out.print() or System.out.println() is similar to printf() in C or cout>> in C++.
print() or println() method is a member of the out object, which is a static data member of System class.
Full Java code to print “Welcome to Java!” (Welcome.java)
class Welcome { public static void main(String args[]) { System.out.println("Welcome To Java!"); } }
Video Tutorial
[youtube https://www.youtube.com/watch?v=lXaFnboq3sk]
[youtube https://www.youtube.com/watch?v=ePG4GE3hmbY]
Please watch the above video tutorial in full screen.
Friend v/s Lover!
Imagine you find 2 people drowning.
One of them is your lover and the
other one is me.
You know swimming and you can
save only one!
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Now here comes the question for you:
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will you come for my funeral ? hahaha ;-)
#justForJoke
Success Is A Journey
“Success is not a destination, it’s a journey.” – Zig Ziglar