Operator tutorials in Java, Operator in Java

Operator Concept in Java:-

It is used to perform operations using operand, the operand can be variable, constant, or literals.

int a=10;  a is the variable,10 is the literals

System.out.println(100+200) ;  100 ,200 is called literals.
.....................................................................................................................................

The operator will be called by a symbol but defined as a method, for example, if we use + operator then + is the symbol but it has defined as  +() method

Operator +(param1)
{

}


Type of Operator:-

1) Unary Operator:-  This operator will work using a single operand.

1.1 Increment:-  increase current value by one

1.1.1  Post Increment:-       operand++

     First complete other operation(print, assign) then increase the value

       int a=5;
       int b;
       b=a++;
       System.out.println(a,",",b);
   
The expected output is b=5 and a=6

1.1.2   Pre Increment:-        ++operand

      First increase value by one after that complete other operation

       int a=5;
       int b;
       b=++a;
       System.out.println(a,",",b);


class Incre
{
   public static void main(String args[])
   {
      int a=2,b=3;  
    
      System.out.println(a++  + "," + ++b );

   }

}


The expected output is  a=2 and b=4


Example of Increment |Decrement:-

class Incre
{
   public static void main(String args[])
   {
      int a=2,b=3; 
      b= a++ + a++ + a++ + a++;
  //   14   2      3        4        5           6


      System.out.println(a  + "," + b);

   }

}

class Incre
{
   public static void main(String args[])
   {
      int a=2,b=3;  
      b = ++a + a++ + ++a + a++;
  // 16      3     3      5    5  6


    System.out.println(a  + "," + b);

   }

}

1.2 Decrement


class Incre
{
   public static void main(String args[])
   {
      int a=12,b=3; 
      b = --a + a-- + --a + a--;
   //  40      11    11     9   9  8
      System.out.println(a  + "," + b);

   }

}

2) Binary  Operator:-

It requires a minimum of two operands to perform the operation.

2.1 ) Arithmetic Operator:-  +,-,*,/,%
2.2)  Conditional Operator:-   <,>,<=,>=
2.3)  Comparison Operator:-  

2.,3.1  Data Comparision Operator ==

2.3.2   Address Comparaision Operator equals():-

 class Eqldemo

{

public static void main(String args[])

{

   String s ="hello";

   String s1 = new String("hello");

   if(s.equals(s1))

   {

      System.out.println("equall");

   }

  else

   {

       System.out.println("not equall");

   }

}

}

2.4)  Assignment Operator

       2.4.1)  Simple     =

       2.4.2)  Complex  Assignment or Shorthand Operator 

          +=,-=,*=,/=,%=

         a+=7  or a=a+7
         a-=3   or a=a-3

 class Eqldemo

{

public static void main(String args[])

{

   int a=5;

   a+=9;  //14

   a-=3;  //11

   a*=12; //132

   a/=17; //7

   a%=3;   //1

   a*=23;  //23

   System.out.println(a);  

}

}

2.5) Logical Operator:-    &&, ||, !

     && :-  it returns true when all condition will be true
      ||:-       it returns true when a particular condition will be true
      !:-        it is the opposite of a true statement and converted the result into a false statement
      

    a=9   
    a>2 && a<5
     a>2 or a<5

Assignment:-

1)  WAP to convert Decimal to binary and binary to decimal

2)  WAP to perform addition of number without using + operator?

3) Ternary Operator:-

It is used to solve condition-based problems using a single-line statement. Ternary operators contain a minimum of three operators to solve statements.

res = (condition)? true : false;


WAP to check that the entered number is even or odd using the ternary operator

class CheckEvenOdd
{
    public static void main(String args[])
    {
        int num=4;
        String s = (num%2==0)?"Even":"Odd";
        System.out.println(s);
       
        

    }


}

class Checkgreater
{
   public static void main(String args[])
   {
      int a=2,b=5;
      String s = (a>b)?"a is greater":"b is greater";
      System.out.println(s);


   }

}
WAP to check vowel and consonant?

WAP to check Leap Year?

The solution to this Program

import java.util.Scanner;

class CheckLeapYear

{

    public static void main(String args[])

    {

        Scanner sc = new Scanner(System.in);

        int year;

        System.out.println("Enter year");

        year = sc.nextInt();

        String s = (year%400==0) || (year%100!=0 && year%4==0)? "leap year": "not a 

leap year";

       System.out.println(s);        

   }

}

Check Leap Year Without using Scanner class?

import java.io.IOException;

class CheckLeapYear

{

    public static void main(String args[]) throws IOException

    {

        

        char arr[] = new char[4];

        

        int year;

        System.out.println("Enter year");

        for(int i=0;i<4;i++)

        {

           arr[i]= (char)System.in.read();

        }

        String s = new String(arr); // char array to String

        year =Integer.parseInt(s);  //String to int

        String s = (year%400==0) || (year%100!=0 && year%4==0)? "leap year": "not a 

leap year";

       System.out.println(s);        

   }

}

WAP to check that today is Sunday or not?

Solution of This Program:-

import java.util.Scanner;

class Weekday

{

   public static void main(String args[])

   {

      String day;

      Scanner sc = new Scanner(System.in);

      System.out.println("Enter day");

      day = sc.next();

      String res = day.equals("sunday") || day.equals("Sunday")?"Today is sunday": 

"Other day";

      System.out.println(res);

   }

}

WAP to check that number is divisible by 3 and 5 both or not?

WAP to check that char is numeric or alphabets?

Solution of this program:-

import java.util.Scanner;

class CheckNumeric

{

public static void main(String args[])

{

     Scanner sc = new Scanner(System.in);

     char ch;

     System.out.println("Enter char");

     ch = sc.next().charAt(0);   //charAt() return the char based on index

     int asc = ch;   // return ascii code

     String s = (asc>=48 && asc<=57)? "Numeric" : "Alphabets";

     System.out.println(s);

      

     

}

 WAP to check the greatest number?

hint:- 

int a=2,b=45,c=30;

String s = (a>b && a>c)? "a is greatest":(b>c)?"b is greatest":"c is greatest";