Conditional Constructs in Java

Chapter 9

Conditional Constructs in Java

Class 9 - Logix Kips ICSE Computer Applications with BlueJ

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Java Programs - Program to display the colour of the spectrum (VIBGYOR) according to the user's choice using switch statement

Java

import java.util.Scanner;
 
public class VIBGYOR {
    public static void main(String[] args) {
 
        Scanner sc = new Scanner(System.in);
 
        System.out.println("Choose a number (1-7) to display a colour:");
        System.out.println("1 - Violet");
        System.out.println("2 - Indigo");
        System.out.println("3 - Blue");
        System.out.println("4 - Green");
        System.out.println("5 - Yellow");
        System.out.println("6 - Orange");
        System.out.println("7 - Red");
 
        System.out.print("\nEnter your choice: ");
        int choice = sc.nextInt();
 
        switch (choice) {
            case 1:
                System.out.println("Colour: Violet");
                break;
            case 2:
                System.out.println("Colour: Indigo");
                break;
            case 3:
                System.out.println("Colour: Blue");
                break;
            case 4:
                System.out.println("Colour: Green");
                break;
            case 5:
                System.out.println("Colour: Yellow");
                break;
            case 6:
                System.out.println("Colour: Orange");
                break;
            case 7:
                System.out.println("Colour: Red");
                break;
            default:
                System.out.println("Invalid choice! Please select between 1 and 7.");
        }
 
        sc.close();
    }
}

Output

Output 1: 
  SAMPLE INPUT : 
Enter your choice: 3

 SAMPLE OUTPUT : 
Colour: Blue

Output 2: 
  SAMPLE INPUT : 
Enter your choice: 7

 SAMPLE OUTPUT : 
Colour: Red

Output 3: (Invalid Choice) 
  SAMPLE INPUT : 
Enter your choice: 9

 SAMPLE OUTPUT : 
Invalid choice! Please select between 1 and 7.

Explanation

1. User Input

int choice = sc.nextInt();

Reads the user’s choice (1–7).

2. switch Statement

switch (choice)

Compares the value of choice with each case.

3. case Labels

Each case corresponds to one colour of the VIBGYOR spectrum.

4. break Statement

Prevents fall-through to the next case.

5. default Case

Executes when the user enters an invalid number.