public class WordPlay {

public boolean isVowel(char c){

char ch = Character.toLowerCase(c);

if(ch=='a' | ch == 'e'| ch=='i' | ch == 'o'| ch == 'u'){

return true;

}

else {

return false;

}

}

public String replaceVowels(String phrase, char ch){

StringBuffer sb = new StringBuffer(phrase);

char rc = ch;

int i= 0;

for(i=0; i<phrase.length();i++){

char c = sb.charAt(i);

if(isVowel(c)){

sb.setCharAt(i, rc);

}

}

String result = sb.toString();

return result;

}

public String emphasize(String phrase, char ch){

int len = phrase.length();

StringBuffer sb = new StringBuffer(phrase);

for(int i=0; i<len; i++){

if((Character.toLowerCase(sb.charAt(i))==Character.toLowerCase(ch))){

if((i % 2)==0){

sb.setCharAt(i, '+');

}

else {

sb.setCharAt(i, '*');

}

}

}

String result = sb.toString();

return result;

}

public static void main(String[] args) {

// TODO Auto-generated method stub

WordPlay wp = new WordPlay();

System.out.println(wp.isVowel('F'));

System.out.println(wp.isVowel('a'));

//System.out.println(wp.isVowel('b'));

//System.out.println(wp.isVowel('o'));

//System.out.println(wp.isVowel('O'));

System.out.println(wp.replaceVowels("Hello World", '*'));

System.out.println(wp.emphasize("dna ctgaaactga", 'a'));

System.out.println(wp.emphasize("Mary Bella Abracadabra", 'a'));

}

}