Question

Write a java program that read a line of input as a sentence and display:  Only the uppercase letters in the sentence.  The sentence, with all lowercase vowels (i.e. “a”, “e”, “i”, “o”, and “u”) replaced by a strike symbol “*”.

Answer 1

Here is the Java code for both the problems.

Sample output is added at the end.

Code:

import java.util.Scanner;

public class StringDisplay {


    /*method to check if a character is lowercase vowel*/
    public static boolean isLowerVowel(char ch){

        if(ch=='a' || ch=='e' || ch=='i' || ch=='o' || ch=='u'){    /*if chartacter is a vowel*/

            return true;

        }
        else{

            return false;

        }
    }

    public static void main(String[] args){

        Scanner scanner=new Scanner(System.in);   /*creates a new Scanner object*/

        System.out.println("Enter a sentence: ");

        String inputString=scanner.nextLine();   /*takes input from user*/

        StringBuilder vowelsReplaced=new StringBuilder();  /*creates a new StringBuilder object*/

        System.out.println("Uppercase letters in sentence are: ");

        for(int i=0;i<inputString.length();i++){    /*runs through all characters in string*/

            if(Character.isUpperCase(inputString.charAt(i))){          /*checks if character is uppercase*/

                System.out.print(inputString.charAt(i)+" ");     /*prints character*/

            }
        }

        for(int i=0;i<inputString.length();i++){     /*runs through all characters in string*/

            if(isLowerVowel(inputString.charAt(i))){     /*checks if the character is lowercase vowel*/

                vowelsReplaced.append('*');     /*append * to vowelsReplaced*/

            }
            else{

                vowelsReplaced.append(inputString.charAt(i));    /*append the character to vowelsReplaced*/

            }
        }

        System.out.println("\nSentence with lowercase vowels replaced by strike symbol is:\n"+vowelsReplaced.toString());  /*print the StringBuilder vowelsReplaced by converting it into string*/
    }
}

Sample Output: