Java Program to Generate Range of Numbers

Java Program to Generate Range Numbers using for loop

In java programming, this program is used to display the integer numbers from range format user input.

Suppose user gives the input 10-15, then this program generates the numbers from 10 to 15 (10, 11, 12, 13, 14, 15).

import java.util.Scanner;

public class RangeNumbers{
	public static void main(String[] args){
		System.out.print("Enter Range (Ex: 10-15): ");
		Scanner sc=new Scanner(System.in);
		String strRange = sc.nextLine();
		String[] strRangeValues = strRange.split("-");
		int min=0,max=0;
		if(strRangeValues.length==2){
			min = Integer.parseInt(strRangeValues[0].trim());
			max = Integer.parseInt(strRangeValues[1].trim());
			if(min<=max){
				System.out.println("Range Numbers");
				for(int i=min;i<=max;i++){
					System.out.print(i+ " ");
				}
				System.out.println();
			}
			else {
				System.out.println("Invalid range!");
			}
		}
		else {
			System.out.println("Invalid range!");
		}
		
	}
}

Output:
D:\Java_Programs>javac RangeNumbers.java
D:\Java_Programs>java RangeNumbers
Enter Range (Ex: 10-15): 11-19
Range Numbers
11 12 13 14 15 16 17 18 19 

D:\Java_Programs>javac RangeNumbers.java
D:\Java_Programs>java RangeNumbers
Enter Range (Ex: 10-15): 14-10
Invalid range!

Java Program to Generate Range Numbers using while loop

import java.util.Scanner;

public class RangeNumbers{
	public static void main(String[] args){
		System.out.print("Enter Range (Ex: 10-15): ");
		Scanner sc=new Scanner(System.in);
		String strRange = sc.nextLine();
		String[] strRangeValues = strRange.split("-");
		int min=0,max=0;
		if(strRangeValues.length==2){
			min = Integer.parseInt(strRangeValues[0].trim());
			max = Integer.parseInt(strRangeValues[1].trim());
			if(min<=max){
				System.out.println("Range Numbers");
				int i=min;
				while(i<=max){
					System.out.print(i+ " ");
					i++;
				}
				System.out.println();
			}
			else {
				System.out.println("Invalid range!");
			}
		}
		else {
			System.out.println("Invalid range!");
		}
		
	}
}
Output:
D:\Java_Programs>javac RangeNumbers.java
D:\Java_Programs>java RangeNumbers
Enter Range (Ex: 10-15): 12-16
Range Numbers
12 13 14 15 16 

D:\Java_Programs>javac RangeNumbers.java
D:\Java_Programs>java RangeNumbers
Enter Range (Ex: 10-15): 14-10
Invalid range!

Difference between Scanner next and nextLine methods

next method is used to read the string till space or line end but when use nextLine method reads the string till end of line.

Example 10 - 11 entered by user, next method reads only 10 but nextLine method reads the string 10 - 11.


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