Java, , ,
  • Java provides IF conditional statements for executing statements based on some condition
  • It can be used to take decision and follow certain execution path conditionally
  • It has the following form:
      if (condition)
              statement(s);
     else
              statement(s);
  • Condition may be any logical or relational expression that returns a Boolean value.
  • If condition is true it returns true value otherwise false
  • Statement may be a single statement or a block of statements enclosed within a curly braces
  • At very first condition is checked.
  • If condition is true then true block of statements is executed and if condition is false, false block will be executed
  • In every case only one block of statement will be executed
  • For example:
 if(X>Y)
   System.out.println(“X is greater”);
else
   System.out.println(“Y is greater”);
  • We can also place one if statement inside another if statement.
  • When one if statement appears inside the another if statement, it is called Nested IF
  • For example:
if (i==10)
{
     if (j<20)
        a=b;
     else
        a=c;
}
else
{
   a=d;
}

If Else Ladder

  • if else ladder is a series of simple if…else statements
  • It can be used to select single choice among multiple options
  • Condition will be checked from the top to the bottom
  • If condition is true, it will execute statements associated with that if otherwise next if will be checked
  • Finally, if no condition evaluates to true then default else part will be executed but if there is no final else part then no action will be take place
  • It has the following form:
   if (condition1)
      statement(s)1;
   else if (condition2)
      statement(s)2;
     ...
     ...
   else
      statement(s);