Conditional Statements

If-else Statement:

If else statement can be used for executing a group of statements based on condition.

Syntax

if(condition){
statement1;   if block
} else{
statement2; else block
}

If the condition is satiesfied then it will be executing if block and if the condition is not satiesfied then it will executing else block.

Program4

class IfElseDemo{
  public static void main(String[] args){
     int n=89;
     if(n%2==0){
     System.out.println("Even Number");
   }
   else{
       System.out.println("odd Number");
      }
     }
   }

Rule1: Specifying the condition to if else statement is mandatory and it should be of boolean type( either a condition or boolean variable or boolean value).

Rule2: Specifying the else block is optional

Rule3: Specifying the { } is optional. If we do not specify the { } then it will consider only one statement, and that one statement is mandatory. If we want to consider multiple statements then specifying the { } is mandatory. Within the { } we can specify any number of statements.

Rule4: In If else statement we can not execute both the blocks and we can not skip both the blocks, it will always execute exactly one block.