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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone {
  9. 	public static void main (String[] args) throws java.lang.Exception {
  10. 		Scanner in = new Scanner(System.in);
  11. 	    System.out.println("Please Enter a string: ");
  12.  
  13. 		// split input string in to words by space
  14. 	    String[] words = in.nextLine().split(" ");
  15.  
  16. 	    // performing reverse operation if 3 words are in the input at minimum
  17. 	    // else output is same as input
  18. 	    if (words.length >= 3) {
  19. 	    	String rev1 = reverse(words[0]); // reverse word-1
  20. 	    	String rev3 = reverse(words[2]); // reverse word-3
  21. 	    	// swap word 1 and 3
  22. 	    	words[0] = rev3;
  23. 	    	words[2] = rev1;
  24. 	    }
  25.  
  26. 	    System.out.println("Reverse: " + String.join(" ", words));
  27.     }
  28.  
  29. 	public static String reverse(String word) {
  30. 		if (word == null) {
  31. 			return word;
  32. 		}
  33. 	    Stack<Character> stack = new Stack<>();
  34. 	    for(int i = 0; i < word.length(); i++){
  35. 	        stack.push(word.charAt(i));
  36. 	    }
  37. 	    StringBuilder sb = new StringBuilder();
  38. 	    while(!stack.empty()){
  39. 	        sb.append(stack.pop());
  40. 	    }
  41. 	    return sb.toString();
  42.     }
  43. }
Success #stdin #stdout 0.15s 37952KB
comments (?)
stdin 
This is the new normal
stdout 
Please Enter a string: 
Reverse: eht is sihT new normal
https://ideone.com/JrjkK9
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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