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if else in java

Whenever we have to check any condition and take the decision, if that condition is correct. Then only the statement runs. So in that condition we use if

Syntax for if in java

if(argument){
//code to be exucuted 
}

The argument to the if statement should be Boolean. and the if statement also known as conditional statment.

code for if statement

class IfElseProgram{
   public static void main(String[] args) {
      int a = 10;
      if(a==10){
         System.out.println("a is equal b");
      }
   }
}

Output : 

 
   
      true

if we are trying to give any other than boolean in the argument of the if statement then we will get compile time error.

Example 2

class IfElseProgram{
   public static void main(String[] args) {
      int a = 20;
      if(a){ // a is a int now we will get compiler time error
         System.out.println("a is greater b");
      }
   }
}

Output : 

error: incompatible types: int cannot be converted to boolean
      if(a){ // a is a int now we will get compiler time error
         ^
1 error
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if else statement in java

If-else statement is same as if statement but in this statement if condition is true then if statement will execute and if statement false then else block will execute.

Syntax for if else statement java 

if(condition){
//code to be exucuted true
}else{
//code to be exucuted false                    
}

Example for if else


import java.util.Scanner;
class Aman{
   public static void main(String[] args) {
      Scanner scr = new Scanner(System.in);
      System.out.println("Enter the age");
      int age = scr.nextInt();
      if(age>=18){ 
         System.out.println("worth voting");
      }else{
         System.out.println("not worth voting");
      }
   }
}

Output : 


   enter the age
   20
   worth voting

java if statement multiple conditions

Syntax for java if statement multiple conditions


   if(condition1 && condition2 && condition3){
      //code to be exucuted true
   }


import java.util.Scanner;
class MultipleConditionIfElse{
   public static void main(String args[]){
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter username");
      String username = sc.nextLine();
      System.out.println("Enter password");      
      String password = sc.nextLine();
      if(username.equals("b2eprogrammers")&&password.equals("b2e@123")){
         System.out.println("Login success");
      }else{
         System.out.println("Login fail");
      }
   }
}


   Enter username
   b2eprogrammers
   Enter password
   b2e@123
   Login success
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if we want to check all condition as true then we should go with && operator with all condition.

Example

else if ladder in java

Syntax

      
         if(condition)
         {code to be exucuted true
         }
         else if(condition)
         {
            code to be exucuted true
         }
         else if(condition)
         {
            code to be exucuted true
         }
         else{
         code to be exucuted false
         }

Defination if else if statement

Example 

class Aman{
   public static void main(String[] args) {
      int a = 50;
      int b = 100;
      int c = 30;
      int d = 5;
      if(a>b&&a>c&&a>d){ 
         System.out.println("a is greater");
      }else if(b>a&&b>c&&b>d){
         System.out.println("b is greater");
      }else if(c>a&&c>b&&c>d){
         System.out.println("c is greater");
      }else{
         System.out.println("d is greater");
      }
   }
}

Output : 

 
   
     b is greater
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