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Find Greatest of Three Numbers in Java (Largest Number Program)

As a programmer, it's essential to be proficient in comparing and determining the greatest value among multiple inputs. In this tutorial, we will explore several approaches to find the greatest of three numbers in Java programming.

We will learn about various Java programs, each using different techniques to identify the largest of three numbers efficiently. By examining these approaches, you'll gain valuable insights into the versatility of Java and learn how to make informed decisions based on the requirements of your projects.

Let’s get started and learn about the Java program to find largest of three numbers using ternary operator, conditional statements, nested if, and more.

Java Concepts to Learn for This Program:

Java Program to Find Largest of Three Numbers

Here's a simple program to find greatest among three numbers in Java:

Code

public class LargestOfThreeNumbers {
    public static void main(String[] args) {
        int num1 = 10;
        int num2 = 25;
        int num3 = 15;

        int largest = Math.max(Math.max(num1, num2), num3);

        System.out.println("The largest of the three numbers is: " + largest);
    }
}

Output

The largest of the three numbers is: 25

Explanation

In this program, we define three integer variables num1, num2, and num3, each representing a different number. 

The Math.max() method is then used to find the maximum of these three numbers by chaining multiple calls to the method. 

Finally, the largest number is printed on the console. You can easily change the values of num1, num2, and num3 to test the program with different inputs.

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Largest of Three Numbers in Java Using Ternary Operator

You can find the greatest of three numbers using the conditional (ternary) operator in Java.

Code

public class GreatestOfThreeNumbers {
    public static void main(String[] args) {
        int num1 = 10;
        int num2 = 25;
        int num3 = 15;

        int greatest = (num1 > num2) ? ((num1 > num3) ? num1 : num3) : ((num2 > num3) ? num2 : num3);

        System.out.println("The greatest of the three numbers is: " + greatest);
    }
}

Output

The greatest of the three numbers is: 25

Explanation

In this program, we use nested conditional operators to compare num1, num2, and num3. 

The expression (num1 > num2) ? ((num1 > num3) ? num1 : num3) : ((num2 > num3) ? num2 : num3) finds the greatest number among the three. 

If num1 is greater than num2, it checks whether num1 is also greater than num3, and if so, num1 is the greatest. Otherwise, num3 is the greatest. If num1 is not greater than num2, it checks whether num2 is greater than num3, and if so, num2 is the greatest. Otherwise, num3 is the greatest.The result is then stored in the greatest variable, which is printed to the console.

Largest of Three Numbers in Java Using if else

Here's a Java program to find the largest of three numbers using if-else statements:

Code

public class LargestOfThreeNumbers {
    public static void main(String[] args) {
        int num1 = 10;
        int num2 = 25;
        int num3 = 15;

        int largest;

        if (num1 >= num2 && num1 >= num3) {
            largest = num1;
        } else if (num2 >= num1 && num2 >= num3) {
            largest = num2;
        } else {
            largest = num3;
        }

        System.out.println("The largest of the three numbers is: " + largest);
    }
}

Output

The largest of the three numbers is: 25

Explanation

In this program, we use if-else statements to compare the values of num1, num2, and num3. 

The largest number in Java is determined by the following conditions:

  • If num1 is greater than or equal to both num2 and num3, then num1 is the largest.

  • If num2 is greater than or equal to both num1 and num3, then num2 is the largest.

  • Otherwise, num3 is the largest.

The result is then stored in the largest variable.

Greatest of Three Numbers in Java Using nested if

Here's a Java program to find the greatest of three numbers using nested if statements:

Code

public class GreatestOfThreeNumbers {
    public static void main(String[] args) {
        int num1 = 10;
        int num2 = 25;
        int num3 = 15;

        int greatest;

        if (num1 >= num2) {
            if (num1 >= num3) {
                greatest = num1;
            } else {
                greatest = num3;
            }
        } else {
            if (num2 >= num3) {
                greatest = num2;
            } else {
                greatest = num3;
            }
        }

        System.out.println("The greatest of the three numbers is: " + greatest);
    }
}

Output

The greatest of the three numbers is: 25

Explanation

In this program, we use nested if statements to compare the values of num1, num2, and num3. 

The logic is as follows:

  • The outer if-else checks whether num1 is greater than or equal to num2.

  • If num1 is greater than or equal to num2, it then checks whether num1 is also greater than or equal to num3. If so, num1 is the greatest.

  • If num1 is not greater than or equal to num3, it means num3 is the greatest.

  • If num1 is not greater than or equal to num2, it means num2 is greater.

  • The inner if-else within the else block checks whether num2 is greater than or equal to num3. If so, num2 is the greatest.

  • If num2 is not greater than or equal to num3, it means num3 is the greatest.

The outer if-else checks whether num1 is greater than or equal to num2.

The result is then stored in the greatest variable.

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