Java Tutorial Day 1

Java Tutorial Day 1 (Hello World)

Learning Objective: Let’s start with Java Fundamental and Understand its syntax and usages in real life applications.

funda1.java

public class funda1{

    public static void main(String[] args)
    {
        System.out.println("Hello");
    }
}

funda2.java

/*
*  Variable Rules
*
* Names can contain letters, digits, underscores, and dollar signs
* Names must begin with a letter
* Names should start with a lowercase letter and it cannot contain whitespace
* Names are case sensitive ("Name" and "name" are different variables)
* Do not use Reserved words (like Java keywords, such as int or boolean) cannot be used as names
* 
* Data Types Supported: String, int, float, char, boolean
*/

public class funda2{
    public static void main(String[] args) {
        
        System.out.println("---------------------------------");

        System.out.println("int Variable Example");
        int mark = 10;
        System.out.println("Mark is :" + mark);  

        System.out.println("---------------------------------");

        System.out.println("String Variable Example");
        String fname = "Adarsh";
        String lname = "Patel";
        System.out.println(fname + " " + lname);  

      }
}

funda3.java

/*
*  Operators Supported in java
*
*  +	Addition
*  -	Subtraction
*  *	Multiplication
*  /	Division
*  %	Modulus
*  ++	Increment
*  --	Decrement
*
*/
public class funda3{
    public static void main(String[] args) {
        int no1 = 10;
        int no2 = 20;
        
        System.out.println("---------------------------------");
        System.out.println("      Operator Examples");
        System.out.println("---------------------------------");
        System.out.println("no1 is: " + no1 + ", no2 is: " + no2);
        System.out.println("---------------------------------");
       
        System.out.println("+ :" + (no1+no2));  
        System.out.println("- :" + (no1-no2));  
        System.out.println("* :" + no1*no2);  
        System.out.println("/ :" + no2/no1);  
        System.out.println("% :" + no2%no1);  
        System.out.println("++ (postfix) :" + no1++);
        System.out.println("++ (prefix) :" + ++no1);  
        System.out.println("-- (postfix) :" + no1--);
        System.out.println("-- (prefix) :" + --no1);  

        System.out.println("---------------------------------");
      }
}

funda4.java

public class funda4{
    public static void main(String[] args) {
        int no1 = 0;
                
        System.out.println("---------------------------------");
        System.out.println("      Conditional Structures");
        System.out.println("---------------------------------");
        System.out.println("no1 is: " + no1);
        System.out.println("---------------------------------");
       
        if(no1>0)
        {
            System.out.println("no1 is positive");
        }
        else if(no1<0)
        {
            System.out.println("no1 is Negative");
        }
        else 
        {
            System.out.println("no1 is zero");
        }

        if(no1==0)
        {
            System.out.println("no1 is zero");
        }
        else
        {
            System.out.println("no1 is Non Zero");
        }

        System.out.println("---------------------------------");
      }
}

funda5.java

public class funda5{
    public static void main(String[] args) {
        int no1 = 5;
        int i;
                
        System.out.println("---------------------------------");
        System.out.println("      For and While Loop");
        System.out.println("---------------------------------");
        System.out.println("no1 is: " + no1);
        System.out.println("---------------------------------");

        System.out.println("For Loop Example");

        for(i=1;i<=no1;i++)
        {
            System.out.println(i);
        }

        System.out.println("While Loop Example");

        i=1;
        while(i<=no1)
        {
            System.out.println(i);
            i++;
        }

        System.out.println("---------------------------------");
      }
}

funda6.java

public class funda6{
    String name = "";
    int mark1=0,mark2=0,mark3=0;


    public static void main(String[] args) {

                
        System.out.println("---------------------------------");
        System.out.println("      Class / Object Example");
        System.out.println("---------------------------------");
      
        System.out.println("Student Object Details");

        prog6 std = new prog6();
        std.name = "Adarsh";
        std.mark1 = 50;
        std.mark2 = 60;
        std.mark3 = 70;
        System.out.println("Name: " + std.name);
        System.out.println("Mark1: " + std.mark1);
        System.out.println("Mark2: " + std.mark2);
        System.out.println("Mark3: " + std.mark3);
        
        System.out.println("---------------------------------");

        
        prog6 std2 = new prog6();
        std2.name = "Raj";
        std2.mark1 = 70;
        std2.mark2 = 80;
        std2.mark3 = 90;
        System.out.println("Name: " + std2.name);
        System.out.println("Mark1: " + std2.mark1);
        System.out.println("Mark2: " + std2.mark2);
        System.out.println("Mark3: " + std2.mark3);
     
        System.out.println("---------------------------------");
      }
}