Java Program to Generate Range of Characters

Java Program to Generate Range Characters using for loop

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

Suppose user gives the input A-D, then this program generates the characters from A to D (A, B, C, D).

import java.util.Scanner;

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

D:\Java_Programs>javac RangeCharacters.java
D:\Java_Programs>java RangeCharacters
Enter Characters Range (Ex: A-D): C-F
Range of Characters
C D E F 

D:\Java_Programs>javac RangeCharacters.java
D:\Java_Programs>java RangeCharacters
Enter Characters Range (Ex: A-D): D-A
Invalid range!

D:\Java_Programs>javac RangeCharacters.java
D:\Java_Programs>java RangeCharacters
Enter Characters Range (Ex: A-D): f-l
Range of Characters
f g h i j k l 

Java Program to Generate Range Characters using while loop

import java.util.Scanner;

public class RangeCharacters{
	public static void main(String[] args){
		System.out.print("Enter Characters Range (Ex: A-D): ");
		Scanner sc=new Scanner(System.in);
		String strRange = sc.nextLine();
		String[] strRangeValues = strRange.split("-");
		int min=0,max=0;
		if(strRangeValues.length==2){
			min = strRangeValues[0].trim().toCharArray()[0];
			max = strRangeValues[1].trim().toCharArray()[0];
			if(min<=max){
				System.out.println("Range of Characters");
				int i = min;
				while(i<=max){
					System.out.print((char)i+ " ");
					i++;
				}
				System.out.println();
			}
			else {
				System.out.println("Invalid range!");
			}
		}
		else {
			System.out.println("Invalid range!");
		}
		
	}
}

D:\Java_Programs>javac RangeCharacters.java
D:\Java_Programs>java RangeCharacters
Enter Characters Range (Ex: A-D): E-H
Range of Characters
E F G H 

D:\Java_Programs>javac RangeCharacters.java
D:\Java_Programs>java RangeCharacters
Enter Characters Range (Ex: A-D): H-E
Invalid range!

D:\Java_Programs>javac RangeCharacters.java
D:\Java_Programs>java RangeCharacters
Enter Characters Range (Ex: A-D): f-l
Range of Characters
f g h i j k l 

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.