Java: Three integers and check whether they are consecutive

Last update on March 11 2025 11:08:29 (UTC/GMT +8 hours)

Check Consecutive Integers

From Wikipedia-
Consecutive numbers are numbers that follow each other in order. They have a difference of 1 between every two numbers. In a set of consecutive numbers, the mean and the median are equal.
If n is a number, then the next numbers will be n+1 and n+2.

Write a Java method that accepts three integers and checks whether they are consecutive or not. Returns true or false.

Pictorial Presentation:

Examples:
Consecutive numbers that follow each other in order:
1, 2, 3, 4, 5
-3, −2, −1, 0, 1, 2, 3, 4
6, 7, 8, 9, 10, 11, 12, 13

Sample Solution:

Java Code:

import java.util.Scanner;
public class Main { 
 public static void main(String[] args)
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input the first number: ");
        int x = in.nextInt();
        System.out.print("Input the second number: ");
        int y = in.nextInt();
        System.out.print("Input the third number: ");
        int z = in.nextInt();
        System.out.print("Check whether the three said numbers are consecutive or not!");
        System.out.println(test(x,y,z));
        }

 public static boolean test(int x, int y, int z){
    int max_num = Math.max(x, Math.max(y, z));
    int min_num = Math.min(x, Math.min(y, z));
    int middle_num = x+y+z - max_num - min_num;
    return (max_num - middle_num) == 1 && (middle_num - min_num == 1);
  }
} 

Sample Output:

Input the first number:  15
Input the second number:  16
Input the third number:  17
Check whether the three said numbers are consecutive or not!true

Flowchart :

For more Practice: Solve these Related Problems:

• Write a Java program to check if three integers are consecutive in either ascending or descending order.
• Write a Java program to determine if a sequence of integers of variable length forms a consecutive series.
• Write a Java program to check if three integers form a consecutive sequence after sorting them.
• Write a Java program to check for consecutive numbers in an array while ignoring duplicate entries.

Java Code Editor:

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