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Java program to swap first and last characters of words in a sentence
Following is the Java program to swap first and last characters of word in a sentence −
Example
public class Demo {
static String swap_chars(String my_str) {
char[] my_ch = my_str.toCharArray();
for (int i = 0; i < my_ch.length; i++) {
int k = i;
while (i < my_ch.length && my_ch[i] != ' ')
i++;
char temp = my_ch[k];
my_ch[k] = my_ch[i - 1];
my_ch[i - 1] = temp;
}
return new String(my_ch);
}
public static void main(String[] args) {
String my_str = "Thas is a sample";
System.out.println("The string after swapping the last characters of every word is : ");
System.out.println(swap_chars(my_str));
}
}Output
The string after swapping the last characters of every word is : shaT si a eampls
Explanation
A class named Demo contains a function named ‘swap_chars’ which returns a string as output. In this function, the string is converted to a character array. The character array is iterated over, and if the next element in the word is not a space, the first and the last elements are swapped, and this string is returned as output of the function. The same is repeated for all words in a sentence. In the main function, the string is defined, and the function is called by passing this string as a parameter to it.
Updated on: 14-Sep-2020
1K+ Views
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