Nested if else statement

Nesting means writing one statement into another statement.Nested if else allows us to write one if else inside another if else.

Nesting is required when we want to check another condition inside one condition.

Syntax

if ( condition1 )
{
	condition1 statement;
	if( sub-condition )
	{
		sub-condition statement;
	}
	else
	{
		sub-condition else statement;
	}
}
else
{
	condition1 else statement;
}

Flowchart

How nested if-else works?

First condition1 is checked, if it is true then control enteres inside block and again check for the sub-conditions same as normal if else

If condition1 becomes false then control jumps to the else block and execute it.

Example

Finding the largest number from given three numbers using nested if else

public class FindThreeGreatestEx 
{
    public static void main(String[] args) 
    {
	int first = 30, second = 20, third = 50;
		
	if(first>second)
	{
	    if(first>third)
		System.out.println("Greater is "+first);
	    else
		System.out.println("Greater is "+third);
	}
	else 
	{
	    if(second>third)
		System.out.println("Greater is "+second);
	    else
		System.out.println("Greater is "+third);
	}
    }
}

Output