Question

Write a Java class that examines a single character input from the keyboard. Follow this dialog to guide your coding:

Type a single character and press Enter: m

Digit: No
Letter: Yes
Lowercase: Yes
Toggle case: M

Note: There is no "next" method of the Scanner class to obtain input from the keyboard of data type char. It simply doesn't exist so you need a workaround. Store the end-user input into a String variable; then extract the first character using the appropriate String class method (see the chart in Notes 4). Assign the resulting character to a variable of type char and use it for the remainder of the solution.

Answer 1

Screenshot of the code with comments:

Sample output:

For input character 'm'

Source code:

import java.util.Scanner;

public class HelloWorld{
  
public static void main(String []args){

Scanner sc=new Scanner(System.in);

// Accepting a character from the user
System.out.println("Type a single character and press Enter: ");
String str=sc.next();
char ch=str.charAt(0);

// Check if the character is a digit
if(Character.isDigit(ch))
System.out.println("Digit: Yes");

// If not, proceed to check if it is a letter
else
System.out.println("Digit: No");
  
if(Character.isLetter(ch))
{ System.out.println("Letter: Yes");
System.out.print("Lowercase: ");

// Check if the character is lowercase and toggle it
if(Character.isLowerCase(ch))
{ System.out.println("Yes");
System.out.print("Toggle case :");
System.out.println(Character.toUpperCase(ch));
}
  
// If not display NO and toggle it
else
{
System.out.println("No");
System.out.print("Toggle case :");
System.out.println(Character.toLowerCase(ch));
}
}
  
}
}