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  1.  
  2. import java.util.*; 
  3. import java.lang.Character.*;
  4. import java.io.*;
  5.  
  6. class Main {
  7.  
  8.   public static String SwapII(String str) {
  9.     // Write your logic here
  10.     String s="";
  11.     int r=-1;
  12.     for(int i=0;i<str.length();i++)
  13.     {
  14.         if(str.charAt(i)==' ')
  15.         {
  16.             r=-1;
  17.             s=s+(str.charAt(i)+"");
  18.         }
  19.         else if(Character.isLetter(str.charAt(i)))
  20.         {
  21.              if(Character.isLowerCase(str.charAt(i)))
  22.              {
  23.                  s=s+(Character.toUpperCase(str.charAt(i))+"");
  24.              }
  25.              else
  26.              {
  27.                  s=s+(Character.toLowerCase(str.charAt(i))+"");
  28.              }
  29.         }
  30.         else if(Character.isDigit(str.charAt(i)))
  31.         {
  32.             if(r!=-1)
  33.             {
  34.                 int p=str.charAt(r);
  35.             //  s=s.substring(0,i)+(str.charAt(i)+"")+s.substring(i+1,s.length());
  36.                 s=s+(p+"");
  37.             }
  38.             else
  39.             {
  40.             r=i;
  41.             s=s+(str.charAt(i)+"");
  42.             }
  43.         }
  44.         else
  45.         {
  46.             s=s+(str.charAt(i)+"");
  47.         }
  48.     }
  49.    // System.out.println("Hii");
  50.     return s;
  51.   }
  52.  
  53.   public static void main (String[] args) {  
  54.     // keep this function call here     
  55.     Scanner s = new Scanner(System.in);
  56.     System.out.print(SwapII(s.nextLine())); 
  57.   }
  58.  
  59. }
  60.  
Success #stdin #stdout 0.21s 60956KB
comments (?)
stdin
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Hello 5lol6
stdout
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hELLO 5LOL53
https://ideone.com/q6D37V
language:
Java (12.0.1)
created:
3 days ago
visibility:
public

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