If you are using strings in java , especially in a loop, don't use + operator to connect strings.

String result  = "";
for(String s: strArray)
{
   result = result + s;
}
return result;

The above is bad from a performance perspective. Every time, a string is added, it creates a new String object. And if you are using a large array, that will increase your memory usage.

To avoid this memory usage, use StringBuilder class. StringBuilder makes concatenation easier.

StringBuilder sb = new StringBuilder();
for(String s: strArray)
{
   sb.append(s);
}
return sb.toString();

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