Skip to main content

Complete Program Explanation of Java



class Hello
{
   public static void main(String abc[])
   {
       System.out.println("hello world");
   }
}
//class is the blueprint of the object, it is used to define the functionality of the object using data member and member function. we can define a single object and multiple objects definition both using class.
{}   --->  it is called token of class which is used to define block, all block-level statements will be defined by this. for example if-else, switch, loop, function, etc
public:-   it is an access specifier or access modifier that is used to define the scope of the data member, member function, and class, the public can be accessible outside of the project, package, method, and class.
static:- it is called a non-access modifier of java that provides compile-time memory allocation means if we create a static variable then its memory will be fixed but a value can be changed, static variable, and method will be called without any object.
void:-  it is a data type that returns the null value in java.
main():-   it is a predefined entry-point function that will be mandatory for program execution.main() always will be declared static because it will be called without any object. implicit.
String args[]:- args is the argument that is used to contain String array type data using the command line, if we want to pass data from command line input then it will work. String type array is mandatory in the main() as a parameter.
args is the user define identifier, it names can be changed.
System:-  It is the predefined class of java that exists under java.lang package .it is used to handle input /output operations using Java.
out:-   It is the reference of PrintStream class which is used to print statements using print() or println().
print() or println():-  It is used to print output data of java. It is the method of the PrintStream class.
"hello world":-  It is String type literal
;   it means the end of the statement
Labels:

Comments

  1. ayanNovember 5, 2020 at 5:58 PM

    solution of area of tringle using heron's formula.
    public class Main
    {
    public static void main(String[] args) {
    int a=3,b=4,c=5;
    int s;
    s=(a+b+c)/2;
    int r;
    r=s*(s-a)*(s-b)*(s-c);
    System.out.println(Math.sqrt(r));
    }
    }

    ReplyDelete
  2. Shiva GautamJanuary 21, 2021 at 11:04 AM

    Command Line

    class Terminal
    {
    public static void main(String args[])
    {
    System.out.println(args[0] + " "+ args[1]);

    }

    }

    ReplyDelete
  3. yogesh serokeOctober 13, 2021 at 8:48 PM

    //Yogesh seroke
    public class Main
    {
    public static void main(String[] args) {
    int a=3,b=4,c=5;
    int s;
    s=(a+b+c)/2;
    int r;
    r=s*(s-a)*(s-b)*(s-c);
    System.out.println(Math.sqrt(r));
    }
    }

    ReplyDelete
  4. UnknownJanuary 7, 2022 at 12:48 PM

    //Prachi Malvi
    class Areaoftriangle
    {
    public static void main(String args[])
    {
    double a,b,c,s,Area;
    a = 5;
    b = 6;
    c = 2;
    s = (a+b+c)/2;
    Area = Math.sqrt(s*(s-a)*(s-b)*(s-c));
    System.out.println(Area);
    }
    }

    ReplyDelete

Post a Comment

POST Answer of Questions and ASK to Doubt

Popular posts from this blog

Uncontrolled form input in React-JS

  Uncontrolled form input in React-JS? If we want to take input from users without any separate event handling then we can uncontrolled the data binding technique. The uncontrolled input is similar to the traditional HTML form inputs. The DOM itself handles the form data. Here, the HTML elements maintain their own state that will be updated when the input value changes. To write an uncontrolled component, you need to use a ref to get form values from the DOM. In other words, there is no need to write an event handler for every state update. You can use a ref to access the input field value of the form from the DOM. Example of Uncontrolled Form Input:- import React from "react" ; export class Info extends React . Component {     constructor ( props )     {         super ( props );         this . fun = this . fun . bind ( this ); //event method binding         this . input = React . createRef ();...
Post a Comment
Read more

JSP Page design using Internal CSS

  JSP is used to design the user interface of an application, CSS is used to provide set of properties. Jsp provide proper page template to create user interface of dynamic web application. We can write CSS using three different ways 1)  inline CSS:-   we will write CSS tag under HTML elements <div style="width:200px; height:100px; background-color:green;"></div> 2)  Internal CSS:-  we will write CSS under <style> block. <style type="text/css"> #abc { width:200px;  height:100px;  background-color:green; } </style> <div id="abc"></div> 3) External CSS:-  we will write CSS to create a separate file and link it into HTML Web pages. create a separate file and named it style.css #abc { width:200px;  height:100px;  background-color:green; } go into Jsp page and link style.css <link href="style.css"  type="text/css" rel="stylesheet"   /> <div id="abc"> </div> Exam...
Post a Comment
Read more

JDBC using JSP and Servlet

JDBC means Java Database Connectivity ,It is intermediates from Application to database. JDBC has different type of divers and provides to communicate from database server. JDBC contain four different type of approach to communicate with Database Type 1:- JDBC-ODBC Driver Type2:- JDBC Vendor specific Type3 :- JDBC Network Specific Type4:- JDBC Client-Server based Driver  or JAVA thin driver:- Mostly we prefer Type 4 type of Driver to communicate with database server. Step for JDBC:- 1  Create Database using MYSQL ,ORACLE ,MS-SQL or any other database 2   Create Table using database server 3   Create Form according to database table 4  Submit Form and get form data into servlet 5  write JDBC Code:-     5.1)   import package    import java.sql.*     5.2)  Add JDBC Driver according to database ide tools     5.3)  call driver in program         ...
4 comments
Read more