Reverse a string containing Japaneese and chinese characters

Problem statement: We need to reverse the sentence containing Japanese and Chinese character.

Ex "ABCabcDEFdef . Here we need to assume that the capital letters are Japanese and smaller letters are Chinese.

We need to get an o/p as "defDEFabcABC"

Steps involved

• Write function to identify if the character is Chinese or Japanese character
• Check if previous character is different than the current. If it is different then add a space
• Use split and then reverse the string
• Remove the empty space

public class ArrayFunctions {
 /*
  * 
  * Function to reverse a phrase 
  */
 public static String ReversePhrase(String phrase)
 {
  String [] words =phrase.split(" ");
  
  String rev="";
  //loop
  for(int i=words.length-1;i>=0;i--)
  {
   rev=rev+words[i]+ " ";
  }
  
  return rev;
 }
 
 /*
  * 
  * Function to reverse a word 
  */
 public static String ReverseWord(String word)
 {
  char [] chars =word.toCharArray();
  
  String rev="";
  //loop
  for(int i=chars.length-1;i>=0;i--)
  {
   rev=rev+chars[i]+ " ";
  }
  
  return rev;
 }
  
 /*
  * Function to reverse string containing japanese or chinese characters
  */
 public static String ReversePhraseChinJap(String phrase)
 {
  char [] words =phrase.toCharArray();
  String revString="";
  
  //loop
  for(int i=words.length-1;i>=0;i--)
  {
   if(IsChinese(words[i]))
   {
    //Check last string in Japanese
    if(!revString.isEmpty())
    {
    char [] checkJapanese=revString.toCharArray();
    char lastChar=checkJapanese[checkJapanese.length-1];
    if (IsJapanese(lastChar))
    {
     revString=revString+" ";
    }
    }
    revString=revString+words[i];
    
   }
   else if(IsJapanese(words[i]))
   {
    //Check last string in chinese
    if(!revString.isEmpty())
    {
    char [] checkChinese=revString.toCharArray();
    char lastChar=checkChinese[checkChinese.length-1];
    if (IsChinese(lastChar))
    {
     revString=revString+" ";
    }
    }
    revString=revString+words[i]; 
   }
  }
  
  //Reverse of all the characters
  String [] sent =revString.split(" ");
  
  String rev="";
  //loop to reverse individual char
  for(int i=0;i<=sent.length-1;i++)
  {
   rev=rev+ ReverseWord(sent[i]);
  }
  
  return rev.replace(" ","");  
    
 }
 /*
  * Function to check if the given character is chinese
  */
 public static Boolean IsChinese(char chinese)
 {
  String  chineseCharac ="abcdef";
  
  int exists=chineseCharac.indexOf(chinese);
  if(exists==-1)
  return false ;
  else
   return true;
 }
 /*
  * Function to check if the given character is japaneese
  */
 public static Boolean IsJapanese(char japanese)
 {
  
  String  chineseCharac ="ABCDEF";
  int exists=chineseCharac.indexOf(japanese);
  if(exists==-1)
  return false ;
  else
   return true;
 }
 
}
;