JAVA

/**
*print out groups of words with the same letters
*@author:huanghui-Java Developer-13544210965
*/
public class Test{

/**
*let the words group by name and print
*out group of words one group per line
*@parameter:words list of word
*/
public void PrintGroupsWithSameLetters(String[] words) {

int len = words.length;

// is word userd flag
int[] pArr = new int[len];

// print result
String[] result = new String[words.length];
int patternLen = 0;
boolean flag = false;

// join the group letters
for(int i = 0; i < len; i++) {
for(int j = 0; j < len; j++){
if(i != j){
flag = isPattern(words[i],words[j]);
if(flag){
  if(pArr[i] == 1){
  result[patternLen] = result[patternLen]+","+words[j];
  }
  if(pArr[j] == 1){
  result[patternLen] = result[patternLen]+","+words[i];
  }
  if(pArr[i] != 1 && pArr[j] != 1 ){
result[patternLen] = words[i]+","+words[j];
pArr[i] = 1;//used
pArr[j] = 1;//used
patternLen++;
  }
}
}
}
}

// get unused letters
for(int i = 0; i< pArr.length; i++){
if(pArr[i] != 1){
result[patternLen] = words[i];
patternLen ++;
}
}

// print result
for(int i = 0; i< result.length; i++){
System.out.println(result[i] == null ? "":result[i]);//the result with group by letters
}

}

/**
* is str1 equals str2( str1 and str2 have the same chars or belong to one)
*@parameter:words list of word
*/
private boolean isPattern(String str1, String str2 ) {

  // filter the null value
boolean flag = false;
if(str1 == null || str2 == null ){
return flag;
}

char[] ch1 = str1.toCharArray();
char[] ch2 = str2.toCharArray();

int len1 = 0;
int len2 = 0;
for(int i = 0; i < ch1.length; i++){
for(int j = 0; j < ch2.length; j++){
if(ch1[i] == ch2[j]){
len1 ++;
}
}
}

for(int i = 0; i < ch2.length; i++){
for(int j = 0; j < ch1.length; j++){
if(ch2[i] == ch1[j]){
len2 ++;
}
}
}

if( len1 == ch1.length || len2 == ch2.length){
flag = true;
}

return flag;
}

public static void main(String[] args) {

Test test = new Test();
String[] words = new String[6];
words[0] = "hat";
words[1] = "top";
words[2] = "potter";
words[3] = "pot";
words[4] = "piera";
words[5] = "ripeaa";

//test method
test.PrintGroupsWithSameLetters(words);
}


}