Java Program to find largest of three Numbers

Here we will write two java programs to find the largest among three numbers. 1) Using if-else..if 2) Using nested If

To understand these programs you should have the knowledge of if..else-if statement in Java. If you are new to java start from Core Java tutorial.

Example 1: Finding largest of three numbers using if-else..if

public class JavaExample{

  public static void main(String[] args) {

      int num1 = 10, num2 = 20, num3 = 7;

      if( num1 >= num2 && num1 >= num3)
          System.out.println(num1+" is the largest Number");

      else if (num2 >= num1 && num2 >= num3)
          System.out.println(num2+" is the largest Number");

      else
          System.out.println(num3+" is the largest Number");
  }
}

Output:

20 is the largest Number

Example 2: Program to find largest number among three numbers using nested if

public class JavaExample{

   public static void main(String[] args) {

      int num1 = 10, num2 = 20, num3 = 7;
        
      if(num1 >= num2) {
   
   if(num1 >= num3)
  /* This will only execute if conditions given in both
   * the if blocks are true, which means num1 is greater
   * than num2 and num3
   */
  System.out.println(num1+" is the largest Number");
   else
         /* This will only execute if the condition in outer if
   * is true and condition in inner if is false. which
   * means num1 is grater than num2 but less than num3.
   * which means num3 is the largest
   */
  System.out.println(num3+" is the largest Number");
      } 
      else {
   
   if(num2 >= num3)
  /* This will execute if the condition in outer if is false
   * and inner if is true which means num3 is greater than num1
   * but num2 is greater than num3. That means num2 is largest
   */
  System.out.println(num2+" is the largest Number");
   else
  /* This will execute if the condition in outer if is false
   * and inner if is false which means num3 is greater than num1
   * and num2. That means num3 is largest
   */
  System.out.println(num3+" is the largest Number");
      }
   }
}

Output:

20 is the largest Number