Thread: How to print the number of palindrome words in a sentence?

public static void main(String args[]){
Scanner sc= new Scanner(System.in);
System.out.println("INPUT:\t");
String str;
int count=0;
str=sc.nextLine();
str=str.replace("."," ");
str=str.replace("?"," ");
str=str.replace("!"," ");
String answer="", ar[]= str.split(" ");
for(int i=0;i < ar.length;i++){
if(isPalindrome(ar[i])){
count++;
answer += ar[i] + " ";
}
}
System.out.println("OUTPUT:\t\t"+answer+"\nNUMBER OF PALINDROMIC WORDS: "+count);
}
public static boolean isPalindrome(String str){
char ch;
int len=str.length(),half=len/2;
for(int i=0;i < half;i++){
if(str.charAt(i)!=str.charAt(len-i-1)) return false;
}
return true;
}


If we are not allowed to use split() function, then how should we proceed?

You can code your own split() function for this task if the provided one is not allowed. You can split a string into it's words by iterating through the characters, adding them to a temporary string, adding this temporary string to a list when you hit a " " and repeating afterwards. It may look like this:

import java.util.List;
import java.util.ArrayList;
 
...
 
public static String[] split(String s) {
	List<String> output = new ArrayList<String>();
	String word = "";
	for (char c : s.toCharArray()) {
		if (c == ' ') {
                        if(word.length() > 0)
			output.add(word);
			word = "";
		} else
			word += c;
	}
	output.add(word);
	String[] array = new String[output.size()];
	array = output.toArray(array);
	return array;
}